Sacral bone tumor surgery is one of the most complex procedures in orthopaedic oncology because the sacrum—the triangular bone at the base of the spine—contains nerves that control walking, bowel and bladder function, and sexual function. The goal of surgery is not only to remove the tumor completely but also to preserve neurological function and maintain the best possible quality of life.
Modern advances in MRI, CT imaging, surgical planning, nerve-preserving techniques, reconstruction, and rehabilitation have significantly improved outcomes. Many benign (non-cancerous) and malignant (cancerous) sacral tumors can now be treated successfully through a multidisciplinary team (MDT) that includes orthopaedic oncologists, spine surgeons, radiologists, medical and radiation oncologists, plastic surgeons, rehabilitation specialists, and specialist nurses.
Treatment is highly individualized. Depending on the tumor type, location, and extent, management may involve observation, surgery, radiotherapy, chemotherapy, or a combination of these treatments. This guide explains the available treatment options, how surgical decisions are made, and what patients can expect before and after treatment.
Figure 1. Anatomy of the sacrum within the pelvis and lower spine.
The sacrum connects the lower spine to the pelvis and forms the back of the pelvic ring.
A diagnosis of a sacral bone tumor can be overwhelming, but treatment has advanced considerably. Careful planning by an experienced multidisciplinary team has significantly improved both survival and functional outcomes.
The sacrum is a large triangular bone located at the base of the spine between the hip bones. It transfers body weight from the spine to the pelvis and legs, making it essential for standing, walking, and maintaining balance.
Unlike most bones, the sacrum contains multiple sacral nerve roots, which control movement of the legs as well as bowel, bladder, and sexual function. Because tumors often grow close to these nerves, treatment requires careful planning to remove the tumor while preserving neurological function whenever possible.
The sacrum is formed by the fusion of five vertebrae (S1–S5) and serves several important functions:
Tumors may originate within the sacrum or spread there from cancers elsewhere in the body.
The level of nerve involvement strongly influences surgical planning and expected recovery.
| Sacral Nerve Root | Primary Function |
|---|---|
| S1 | Walking, climbing stairs, foot strength |
| S2 | Leg movement and sensation; contributes to bowel, bladder, and sexual function |
| S3 | Important for bowel and bladder control |
| S4 | Pelvic floor, bowel, and bladder function |
| S5 | Sensation around the tailbone and anal region |
Whenever possible, surgeons preserve unaffected nerve roots. However, complete removal of a malignant tumor remains the priority when nerve preservation would compromise cancer control.
Figure 2. Sacral nerve roots and their relationship to the sacrum.
The sacral nerves pass through openings in the sacrum and control important functions of the legs, pelvis and pelvic floor.
Sacral surgery does not always result in paralysis or permanent bowel and bladder dysfunction. Functional outcomes depend largely on which sacral nerve roots are involved and whether they can be safely preserved.
The sacrum lies close to several vital structures, including the:
Large tumors involving these structures may require a combined operation involving orthopaedic oncologists, spine surgeons, colorectal surgeons, vascular surgeons, urologists, or plastic surgeons.
Complex sacral tumor surgery is often performed by a multidisciplinary surgical team, improving both tumor control and functional recovery.
The level of the tumor within the sacrum is often more important than its size. A small tumor involving the upper sacral nerve roots may have greater functional implications than a larger tumor located lower in the sacrum.
When discussing surgery, ask your surgeon which sacral nerve roots are involved and what functions are expected to be preserved. This provides a better understanding of the likely recovery and functional outcome.
Every sacral bone tumor is unique. Treatment recommendations are based on detailed imaging, biopsy findings, your overall health, and personal goals. The aim is always to achieve the best possible balance between complete tumor removal and preservation of function.
A sacral bone tumor is an abnormal growth arising within the sacrum, the triangular bone at the base of the spine. These tumors may originate in the sacral bone itself (primary bone tumors) or spread from cancers elsewhere in the body (metastatic bone tumors).
Although rare, sacral tumors require specialized treatment because of their close relationship to the sacral nerves, pelvic organs, and major blood vessels. They are classified as:
Accurate diagnosis is essential because treatment varies significantly between tumor types. While MRI and CT scans define the tumor’s extent, a biopsy is usually required to confirm the diagnosis before treatment.
MRI and CT scans cannot reliably determine whether a sacral tumor is benign or malignant. A carefully planned biopsy performed by a musculoskeletal oncology team is usually essential before deciding on treatment.
Several different tumors can affect the sacrum, each requiring a different treatment approach.
Chordoma is the most common primary malignant sacral tumor. It grows slowly but is locally invasive, often involving nearby nerves and pelvic structures. Treatment usually involves wide surgical removal, with selected patients benefiting from advanced radiotherapy such as proton beam therapy.
Figure 3. MRI appearance of a sacral chordoma.
MRI shows a large sacral tumor arising from the lower sacrum, typical of a chordoma
A giant cell tumor (GCT) is a locally aggressive tumor that commonly affects young adults. Because it can grow large before causing symptoms, treatment may include:
Although GCT rarely spreads, it has a risk of local recurrence.
Figure 4. Imaging of a giant cell tumor of the sacrum.
MRI and CT demonstrate an expansile sacral tumor involving the lower sacrum.
Chondrosarcoma is a malignant cartilage-forming tumor that responds poorly to chemotherapy and conventional radiotherapy. Complete surgical removal offers the best chance of long-term disease control.
Figure 5. Imaging features of sacral chondrosarcoma.
MRI and CT show a destructive tumor involving the sacrum with extension into the surrounding tissues.
Osteosarcoma is a malignant bone-forming tumor that rarely affects the sacrum. Treatment typically combines chemotherapy and surgery, with radiotherapy used in selected cases.
Ewing sarcoma is an aggressive tumor affecting children and young adults. Treatment usually involves chemotherapy, followed by surgery and/or radiotherapy, making its management very different from that of chordoma.
The sacrum is also a common site for bone metastases, particularly from cancers of the:
Treatment focuses on relieving pain, preserving neurological function and mobility, and controlling the underlying cancer through surgery, radiotherapy, systemic therapy, or a combination of these treatments.
Although many sacral tumors cause similar symptoms, their treatments differ considerably. Establishing the correct diagnosis through biopsy is the most important step in planning treatment.
The “best” treatment depends on the tumor diagnosis, not its size alone. Two tumors that appear similar on MRI may require completely different treatment strategies once biopsy results are available.
Chordoma accounts for nearly half of all primary malignant tumors of the sacrum, making it the most common cancerous tumor in this location.
A diagnosis of a bone tumor does not always mean bone cancer. Many sacral tumors are benign or locally aggressive rather than malignant. Even when cancer is diagnosed, modern surgery, advanced radiotherapy, and multidisciplinary care have significantly improved treatment outcomes.
The symptoms of a sacral bone tumor often develop gradually and can resemble common conditions such as lower back pain, sciatica, or degenerative spine disease, leading to delayed diagnosis. Symptoms depend on the type, size, and location of the tumor, as well as whether it involves the sacral nerve roots or nearby pelvic organs. While some tumors are discovered incidentally on imaging, others present with progressive pain or neurological symptoms requiring prompt evaluation.
Pain is the most common symptom of a sacral bone tumor. Unlike mechanical back pain, tumor-related pain typically:
Persistent or unexplained back pain should always be evaluated, particularly if it is progressive.
Tumors involving the sacral nerve roots may cause symptoms similar to sciatica, including:
Although a slipped disc is the most common cause of sciatica, persistent symptoms that fail to improve warrant further investigation.
As the tumor enlarges, it may affect the nerves supplying the legs, leading to:
These changes usually develop gradually and may initially be subtle.
Tumors involving the lower sacral nerves may affect bowel control, causing:
These symptoms generally occur only when the lower sacral nerve roots are significantly involved.
Patients may develop:
Prompt medical assessment is important to prevent urinary complications.
The sacral nerves also contribute to sexual function. Depending on the tumor location, patients may experience:
Not every patient develops bowel, bladder, or sexual dysfunction. These problems depend largely on which sacral nerve roots are affected, and many patients retain normal function when the nerves can be preserved.
Because the sacrum lies deep within the pelvis, swelling is uncommon. Larger tumors may cause:
The location of the tumor often predicts the symptoms.
| Tumor Location | Common Symptoms |
|---|---|
| Upper Sacrum (S1–S2) | Lower back pain, sciatica, leg weakness, difficulty walking |
| Middle Sacrum (S2–S3) | Pain, altered sensation, early bowel or bladder symptoms |
| Lower Sacrum (S3–S5) | Bowel, bladder, sexual dysfunction, perineal numbness |
| Extensive Tumors | Combination of pain, weakness, neurological and pelvic organ dysfunction |
Although most back pain is not caused by a bone tumor, specialist assessment is recommended if you experience:
Progressive night pain that does not improve with rest is an important warning sign of a bone tumor and should never be ignored.
Before your appointment, keep a record of your symptoms, including pain severity, numbness, weakness, and any bowel or bladder changes. This information helps your doctor determine whether further investigations are needed.
Sacral tumors often grow silently because there is ample space within the pelvis. As a result, they may become quite large before producing obvious symptoms.
Most cases of lower back pain are caused by common conditions such as muscle strain or arthritis—not a sacral bone tumor. However, persistent, progressive, or neurological symptoms should be evaluated promptly so that, if a tumor is present, treatment can begin before significant complications develop.
Accurate diagnosis is essential because many sacral tumors produce symptoms similar to common conditions such as sciatica or degenerative spine disease. The goals of evaluation are to confirm the diagnosis, determine the tumor type, define its extent, assess nerve and organ involvement, detect spread, and plan the safest treatment. Importantly, definitive surgery should not be performed without establishing a diagnosis, except in rare emergencies.
Evaluation begins with a detailed medical history and physical examination.
Your doctor will assess:
Although clinical examination identifies neurological deficits, imaging is necessary to accurately define the tumor.
X-rays use low-dose radiation to evaluate bones and are often the first imaging study performed.
They may demonstrate:
However, because the sacrum is surrounded by the pelvis, small sacral tumors are often poorly visualized, making further imaging necessary.
Magnetic resonance imaging (MRI) uses magnetic fields and radio waves to produce detailed images of bone, nerves, muscles, and other soft tissues. It is the most important investigation for sacral bone tumors.
MRI accurately shows:
These findings are critical for surgical planning.
Figure 6. Radiological evaluation of a sacral bone tumor.
X-rays and MRI help assess the location, extent and relationship of the tumor to the sacrum and surrounding structures.
A computed tomography (CT) scan provides excellent visualization of bone anatomy.
CT is particularly useful for assessing:
It is also commonly used to guide core needle biopsies with precision.
Figure 7. CT evaluation of a sacral tumor.
CT provides detailed information about bone destruction and helps plan sacral tumor surgery.
Additional imaging may be recommended depending on the diagnosis.
PET-CT (positron emission tomography-computed tomography) evaluates the whole body for metastatic disease, recurrence, or treatment response.
A bone scan detects areas of increased bone activity and may be useful in selected patients with metastatic or multifocal disease.
A biopsy involves removing a small tissue sample for microscopic examination and is the only reliable method of establishing the exact tumor type.
Most sacral tumors are diagnosed using a CT-guided core needle biopsy, which is accurate and minimally invasive.
Ideally, the biopsy should be performed at the same specialist center that will undertake definitive surgery, as improper biopsy placement can complicate future treatment.
A properly planned biopsy has an extremely low risk of spreading tumor cells and provides essential information that guides the choice of surgery, radiotherapy, or chemotherapy.
For malignant tumors, additional investigations determine whether the disease has spread.
These may include:
Staging helps the multidisciplinary team determine the most appropriate treatment plan and estimate prognosis.
MRI should ideally be performed before biopsy, as it provides the most accurate assessment of the tumor before tissue changes caused by biopsy occur.
Never perform an unplanned excision of a sacral lesion without appropriate imaging and biopsy. Inadequate planning may compromise future surgery and increase the risk of recurrence.
Ask whether your biopsy will be performed by the same multidisciplinary team planning your surgery. Coordinated care helps optimize both diagnosis and treatment.
Imaging shows where the tumor is and how far it extends, but only a biopsy can determine exactly what type of tumor it is.
Waiting for imaging and biopsy results can be difficult, but these investigations are essential for choosing the safest and most effective treatment. A carefully planned diagnosis significantly improves the chances of successful long-term outcomes.
Treatment for a sacral bone tumor is individualized because no single approach is appropriate for every patient. The treatment plan depends on the tumor type, its location within the sacrum, involvement of nearby nerves and organs, and the patient’s overall health and functional goals.
The main aims of treatment are to:
Treatment decisions are best made by a multidisciplinary team (MDT) at a specialist bone tumor center.
Sacral tumors often require input from several specialists, including:
The MDT reviews imaging, biopsy findings, and the patient’s overall condition to develop the safest and most effective treatment plan.
Several factors influence treatment decisions.
The diagnosis largely determines treatment.
The location of the tumor affects:
Treatment planning also considers involvement of:
More extensive tumors often require combined surgery by multiple specialists.
Treatment is also influenced by:
Shared decision-making ensures that patients understand the expected benefits and potential risks of each treatment option.
| Factor | Influence on Treatment |
|---|---|
| Tumor diagnosis | Determines surgery, chemotherapy, or radiotherapy |
| Sacral level | Predicts nerve preservation and functional outcomes |
| Tumor extent | Influences surgical complexity and reconstruction |
| Previous treatment | May limit available options |
| Overall health | Determines suitability for major surgery |
Treatment is determined primarily by the biological behavior of the tumor, not simply its size or appearance on imaging.
A carefully planned multidisciplinary approach is one of the most important factors influencing successful long-term outcomes.
Ask whether your case has been discussed at a multidisciplinary tumor board. Complex sacral tumors are best managed after review by specialists from multiple disciplines.
Although treatment planning may take several days after imaging and biopsy, this allows specialists to recommend the most appropriate treatment tailored to your individual situation.
Not every sacral bone tumor requires surgery. The decision depends on the diagnosis, symptoms, expected benefits, and potential risks.
Small, asymptomatic benign tumors may be monitored with periodic imaging.
Surgery is considered when the tumor:
For most primary malignant sacral tumors, surgery offers the best chance of long-term local control.
The goals are to:
Depending on the diagnosis, surgery may be combined with chemotherapy or radiotherapy.
Surgery for metastatic tumors is usually performed to:
Many patients also receive radiotherapy or systemic cancer treatment.
| Tumor Type | Common Indications |
|---|---|
| Benign tumors | Pain, growth, nerve compression, bone weakening |
| Giant cell tumor | Progressive disease or neurological symptoms |
| Malignant tumors | Curative tumor removal whenever feasible |
| Metastatic tumors | Pain relief, instability, neurological compromise |
Surgery is recommended only when its expected benefits outweigh the risks. In selected patients, particularly those with advanced metastatic disease or unresectable tumors, radiotherapy or other treatments may provide better outcomes than surgery alone.
The objective of surgery is to achieve the best balance between complete tumor control and preservation of neurological function and quality of life.
Progressive leg weakness or new bowel and bladder dysfunction requires urgent specialist assessment, as delayed treatment may lead to permanent neurological damage.
Recommending surgery does not necessarily mean the condition is incurable or life-threatening. In many cases, surgery is performed to preserve function, relieve symptoms, and prevent future complications.
Surgery for sacral bone tumors is highly specialized and aims to completely remove the tumor while preserving as much nerve function and pelvic stability as possible. The type of operation depends on the tumor’s location, size, involvement of the sacral nerve roots, and whether nearby organs or joints are affected.
Unlike many other bone tumors, surgery of the sacrum requires careful planning because the sacral nerves control walking, bladder, bowel, and sexual function. Whenever oncologically safe, surgeons strive to preserve these nerves without compromising tumor removal.
A partial sacrectomy involves removing only the portion of the sacrum affected by the tumor while preserving the remaining sacral bone and nerve roots.
This procedure is suitable for tumors confined to the lower or lateral sacrum.
Potential advantages include:
Figure 8. Partial sacrectomy for a sacral bone tumor.
The tumor is removed along with the involved portion of the sacrum while preserving as much normal bone and nerve function as possible.
A total sacrectomy involves removal of the entire sacrum and is reserved for extensive tumors involving most or all of the sacral bone.
Because this operation removes the connection between the spine and pelvis, complex spinopelvic reconstruction is usually required to restore stability.
Although technically demanding, total sacrectomy may provide the best chance of long-term tumor control in selected patients with large primary malignant tumors.
Figure 9. Sacral chordoma before surgery and postoperative reconstruction.
Imaging demonstrates a large sacral tumor and the postoperative appearance following tumor removal.
For most primary malignant sacral tumors, surgeons aim to remove the tumor en bloc, meaning the entire tumor is removed in one piece with a surrounding margin of healthy tissue.
This technique helps:
Whenever possible, the tumor is removed without cutting through it.
One of the most important aspects of sacral tumor surgery is preserving the sacral nerve roots whenever it is safe to do so.
The ability to preserve nerves depends on whether they are involved by the tumor.
Preserving more nerve roots generally results in better:
In some cases, sacrificing one or more nerve roots is necessary to achieve complete tumor removal.
Preserving nerves is important, but complete removal of a malignant tumor takes priority. Your surgeon carefully balances cancer control with maintaining the best possible quality of life.
After removing large sacral tumors, reconstruction may be required to restore stability between the spine and pelvis.
Reconstruction may involve:
Not every patient requires reconstruction. The need depends on the amount of bone removed and whether the pelvic ring remains stable.
Figure 10. Spinal and pelvic reconstruction following sacral tumor surgery.
Postoperative X-rays demonstrate fixation used to restore stability after extensive sacral tumor resection.
| Procedure | Typical Indication |
|---|---|
| Partial Sacrectomy | Localized tumors with preservation of unaffected sacrum |
| Total Sacrectomy | Extensive tumors involving most or all of the sacrum |
| En Bloc Resection | Primary malignant tumors requiring complete removal |
| Spinopelvic Reconstruction | Large bone defects causing pelvic instability |
The level of sacral nerve preservation is often the strongest predictor of postoperative bowel, bladder, and walking function.
Before surgery, ask your surgeon:
Modern techniques such as 3D surgical planning, patient-specific cutting guides, computer navigation, and custom-made implants have significantly improved the precision and safety of complex sacral tumor surgery in specialized centers.
Sacral tumor surgery is among the most complex procedures in orthopaedic oncology, but careful preoperative planning and multidisciplinary care have greatly improved outcomes. Your surgical team will discuss the expected benefits, risks, and likely functional recovery before treatment.
Recovery after sacral tumor surgery varies depending on the extent of surgery, nerve preservation, reconstruction performed, and the patient’s overall health. While recovery may take several months, a structured rehabilitation program helps most patients regain independence and improve their quality of life.
Most patients remain in the hospital for 1–3 weeks, depending on the complexity of surgery and postoperative recovery.
During this period, the healthcare team focuses on:
Rehabilitation begins soon after surgery.
A physiotherapist helps patients gradually:
Patients with significant nerve loss may require walking aids or braces during recovery.
Recovery of bowel and bladder function depends largely on which sacral nerve roots were preserved.
Some patients regain normal function, while others may require:
Your healthcare team will provide individualized guidance based on your neurological recovery.
Most patients gradually resume daily activities over the following weeks to months.
Return to work depends on:
Heavy lifting and high-impact activities should be avoided until cleared by the treating surgeon.
Early rehabilitation and regular physiotherapy play a vital role in improving mobility, reducing complications, and maximizing long-term function after sacral tumor surgery.
Recovery is gradual. Setting realistic goals and actively participating in your rehabilitation program can significantly improve your functional outcome.
Although recovery after sacral surgery can be challenging, many patients regain good mobility and independence with comprehensive rehabilitation and ongoing support from their multidisciplinary care team.
Sacral tumor surgery is a complex procedure, and like any major operation, it carries potential risks. The likelihood of complications depends on the size and location of the tumor, the extent of surgery, nerve preservation, reconstruction performed, and the patient’s overall health. Careful preoperative planning and experienced multidisciplinary care help minimize these risks.
Because the sacral nerve roots control leg function, bowel, bladder, and sexual function, temporary or permanent neurological deficits may occur if these nerves are involved by the tumor or need to be removed.
Possible complications include:
The sacral region has limited soft tissue coverage, making wound healing more challenging than in many other parts of the body.
Potential complications include:
Plastic surgical muscle flaps are sometimes used to reduce these risks.
Sacral tumors are often located close to major pelvic blood vessels and can be highly vascular.
To reduce blood loss, your surgical team may use:
Patients undergoing spinopelvic reconstruction may experience:
Fortunately, these complications are uncommon with modern surgical techniques and appropriate follow-up.
Despite successful surgery, some tumors may recur locally, particularly if complete removal with adequate margins is not possible.
Regular follow-up with clinical examination and imaging is essential for early detection of recurrence.
| Complication | Possible Consequences |
|---|---|
| Neurological injury | Weakness, bowel, bladder, or sexual dysfunction |
| Wound complications | Delayed healing or infection |
| Bleeding | Blood transfusion or additional procedures |
| Implant-related problems | Hardware failure or revision surgery |
| Tumor recurrence | Additional treatment or surgery |
Although complications are possible, they are carefully discussed before surgery. The surgical plan is designed to maximize tumor control while minimizing the risk of long-term disability.
Surgery performed at specialized musculoskeletal oncology centers is associated with better oncological outcomes and lower complication rates for complex sacral tumors.
Attend all scheduled follow-up visits, as early recognition of complications or recurrence allows timely treatment and improves long-term outcomes.
Reading about potential complications can be overwhelming, but most patients do not experience every complication listed. Your surgeon will discuss the specific risks that apply to your individual condition, helping you make an informed treatment decision.
Yes. Not all sacral tumors are cancerous. Benign tumors such as osteoid osteoma, osteoblastoma, aneurysmal bone cyst, and giant cell tumor can occur in the sacrum. However, because benign and malignant tumors may appear similar on imaging, a biopsy is often required to establish the diagnosis.
No. Treatment depends on the tumor type, symptoms, and extent of disease. Some benign tumors can be monitored, while others may be treated with medication or radiotherapy. Surgery is recommended when it offers the best chance of tumor control, pain relief, or preservation of function.
Many patients are able to walk independently after recovery. Walking ability largely depends on which sacral nerve roots are preserved, the extent of surgery, and participation in rehabilitation. Your surgeon will discuss the expected functional outcome based on your individual case.
It can, particularly if the lower sacral nerve roots (S2–S5) are involved by the tumor or need to be removed. Whenever oncologically safe, surgeons aim to preserve these nerves to maintain bowel and bladder function.
Most patients spend 1–3 weeks in the hospital, while complete recovery may take several months. Physiotherapy and rehabilitation are essential for regaining strength, mobility, and independence.
Some tumors, especially malignant tumors or those that cannot be completely removed, may recur. Regular follow-up with clinical examination and imaging helps detect recurrence early, when further treatment is most effective.
Yes. A CT-guided core needle biopsy performed at a specialist bone tumor center is a safe and reliable procedure. It provides the diagnosis needed to plan the most appropriate treatment.
A second opinion is advisable if you have been diagnosed with a rare sacral tumor, advised to undergo major surgery, or if there is uncertainty regarding the diagnosis or treatment plan. Complex sacral tumors are best managed at specialist musculoskeletal oncology centers.
The information provided on this page is intended for educational purposes only and should not replace professional medical advice, diagnosis, or treatment. Every sacral bone tumor is unique, and treatment decisions should be based on an individual evaluation by a qualified orthopaedic oncologist or musculoskeletal tumor specialist. If you have persistent symptoms or have been diagnosed with a sacral bone tumor, consult your treating specialist to discuss the most appropriate management plan for your condition.
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