Overview
A musculoskeletal tumor biopsy is part of the definitive oncologic operation. Its purpose is to obtain representative diagnostic tissue while limiting contamination and preserving the options for later tumor resection and reconstruction. The skin incision, deep route and any drain site must therefore be planned with the anticipated definitive procedure.
Campbell advises specialist referral before biopsy when a primary bone or soft tissue malignancy is suspected. Both needle and open biopsy tracks are considered contaminated with tumor cells and must be positioned so that they can be removed with the tumor. An unplanned biopsy can compromise subsequent limb salvage even when the tissue diagnosis is correct. (Campbell, Chapter 26.)
Evaluation Before Biopsy
Complete the clinical, laboratory and imaging evaluation before obtaining tissue. Correlate the history, examination and imaging with the differential diagnosis. Imaging before biopsy helps define the lesion and select an appropriate target without the distortion introduced by a biopsy hematoma or wound.
Review the lesion with the musculoskeletal oncology team and the pathologist. Establish what material is needed for diagnosis and any additional studies before entering the lesion. A suspicious mass should not undergo a convenient office excision simply because it appears accessible. The biopsy plan should be made by, or in coordination with, the team responsible for definitive treatment. (Campbell, Chapter 26, pp. 875–877.)
Choosing the Biopsy Method
Method | Useful feature | Limitation relevant to planning |
|---|---|---|
Fine needle aspiration | Obtains cells with a relatively small intervention. | Does not preserve tissue architecture; specific tumor classification may be limited. |
Core needle biopsy | Obtains a tissue core and preserves architecture; many lesions can be diagnosed this way. | Sample quantity may limit grading or additional studies. |
Open incisional biopsy | Provides a larger representative sample when an open approach is selected. | Greater exposure can increase bleeding, wound problems and contamination. |
Excisional biopsy | Removes the entire lesion in carefully selected situations. | Is not the default approach for a large, deep or suspicious soft tissue mass. |
Choose the least disruptive method that can reliably answer the diagnostic question. Open biopsy should be planned at an experienced musculoskeletal oncology center or by the surgeon undertaking definitive surgery. The following technique describes an incisional biopsy rather than an unplanned tumor excision. (Campbell, Chapter 26, Table 26.4.)
Planning the Biopsy Route
Place the incision in line with the anticipated definitive approach and its future resection. Avoid transverse incisions that would require a much wider field of removal. Select a direct deep route through a single muscle compartment rather than opening an intermuscular plane and exposing additional compartments.
Avoid major neurovascular structures and uninvolved tissues that do not need to be crossed. Apply the same route discipline to a needle biopsy; a small skin puncture can still create an unfavorable contaminated tract. If drainage may be necessary, plan its exit in line with the incision so that it also remains within the future resection. (Campbell, Chapter 26, Figure 26.8.)
Preparation and Tissue Coordination
Review the imaging and intended target before positioning and draping. Ensure that the selected approach is compatible with later resection, rather than simply optimizing access to the most superficial part of the mass. Coordinate specimen requirements and intraoperative assessment with pathology.
If a tourniquet is used, Campbell permits elevation before inflation but advises against compressive exsanguination of the tumor-bearing limb. Plan sufficient exposure to control bleeding while keeping dissection confined to the required route. A small incision is not beneficial if it forces blind sampling or uncontrolled tissue injury. (Campbell, Chapter 26.)
Surgical Technique
1. Establish the planned tract
Make the planned longitudinal incision and proceed along the agreed route. Keep the exposure within the selected compartment and minimize manipulation of uninvolved tissue. Protect neurovascular structures without dissecting an unnecessary plane around the lesion.
2. Obtain representative tissue
Sample tissue that reflects the lesion rather than only its surrounding pseudocapsule. For a bone lesion with a soft tissue extension, Campbell recommends sampling the viable advancing soft tissue component where suitable. Select a representative target using the preoperative imaging and operative findings; a sample that is easy to reach may still be nondiagnostic.
Send tissue for intraoperative frozen assessment to confirm that diagnostic material has been obtained. Preserve sufficient material for the planned permanent and additional studies through direct coordination with pathology. Frozen assessment should answer the intended intraoperative question without being treated as a substitute for the full diagnostic evaluation.
3. Manage a required bone window
If entry through bone is necessary, create a round or oval opening to reduce stress concentration. An irregular cortical defect can predispose to a pathologic fracture and complicate limb salvage. Campbell describes plugging the opening with only the minimum methacrylate needed to limit hematoma; excessive material can displace tumor within the bone. The window and its management must fit the lesion and definitive surgical plan.
4. Secure hemostasis
Release a tourniquet, if used, before closure and obtain meticulous hemostasis. A hematoma can extend tumor contamination beyond the intended biopsy tract. Inspect the wound directly rather than relying on tight closure to conceal ongoing bleeding.
5. Close within the planned resection field
If a drain is required, bring it out in line with the incision and within the area that can later be removed with the tumor. Close the wound securely in layers. Avoid wide retention sutures and other unnecessary punctures that expand the contaminated field. (Campbell, Chapter 26, pp. 875–877.)
When to Stop After Biopsy
A frozen section that is uncertain or conflicts with the clinical and imaging findings should lead to deferral of definitive treatment until a firm diagnosis is established. Campbell describes selected situations in which treatment can follow a concordant frozen diagnosis, such as a planned procedure for a confirmed giant cell tumor or metastatic lesion. Those examples do not justify immediate curettage or fixation of an unclassified suspicious lesion.
If atypical cells raise the possibility of sarcoma, defer definitive surgery for completion of the pathologic evaluation. Diagnostic uncertainty should not be resolved by enlarging the operation without an oncologic plan. (Campbell, Chapter 26.)
Aftercare and Diagnostic Review
Monitor wound healing, bleeding, swelling and symptoms that could indicate a hematoma or other complication. Reconcile the final pathology with the clinical and radiologic diagnosis before selecting definitive treatment. A nondiagnostic or discordant result requires coordinated reassessment rather than an assumption that the lesion is benign.
Record the biopsy route and any drain exit accurately for future resection planning. Maintain communication between the operating surgeon, radiologist and pathologist so that the final treatment plan incorporates both the diagnosis and the tissues exposed during biopsy.
Complications and Technical Pearls
Unfavorable tract placement: plan the tract with definitive resection before the skin is entered.
Contamination of additional compartments: avoid unnecessary intermuscular dissection and multiple poorly planned tracks.
Nondiagnostic sampling: obtain representative tumor, not only the pseudocapsule, and confirm adequacy with pathology.
Hematoma: secure hemostasis before closure because the hematoma itself is considered contaminated.
Pathologic fracture: minimize cortical stress concentration when a bone window is required.
Premature definitive treatment: stop when pathology is uncertain or inconsistent with imaging.
References
Toy PC, Heck RK Jr. General principles of tumors. In: Azar FM, Sawyer JR, Throckmorton TW, eds. Campbell's Operative Orthopaedics. 15th ed. Elsevier; 2026. Chapter 26, Biopsy, pp. 875–877; Figures 26.8–26.9, Table 26.4 and Campbell's Concepts on tumor biopsy.