Sarcoma Wide Excision
What the Examiner Expects
Surgical resection of soft tissue sarcomas with wide margins, the primary curative treatment. The examiner expects you to know the workup (MRI for local staging, CT chest for lung metastases, core needle biopsy — NOT excisional — for diagnosis), that the biopsy tract must be excised en bloc with the specimen, and that margins must be ≥ 1 cm or include an intact fascial plane. For large (> 5 cm), deep, high-grade extremity sarcomas, neoadjuvant radiation improves local control (though wound complications increase). Limb-sparing surgery with radiation achieves equivalent survival to amputation for most extremity sarcomas.
Key Examiner Focus Points
- Wide excision with ≥ 1 cm margin or an intact fascial plane
- Biopsy must be performed correctly: longitudinal incision in line with definitive resection
- Neoadjuvant radiation for large (> 5 cm), deep, high-grade extremity sarcomas
- MRI is the imaging modality of choice for local staging
- Retroperitoneal sarcomas: en bloc resection with involved adjacent organs
Common Curveballs
An outside surgeon performed an excisional biopsy (shelled out) of a 5 cm thigh mass — pathology shows high-grade liposarcoma
This is a 'whoops' procedure — inadequate excision with contaminated surgical field. The patient needs re-excision of the entire biopsy scar, tract, and surrounding tissue with wide margins. Neoadjuvant radiation may be considered. The contaminated tissue planes make achieving negative margins more challenging.
Large retroperitoneal sarcoma abutting the left kidney and colon
En bloc resection including involved adjacent organs (nephrectomy, colectomy) is the standard approach for retroperitoneal sarcomas. Unlike extremity sarcomas, radiation for retroperitoneal sarcomas is controversial (STRASS trial showed no benefit for neoadjuvant RT). Complete gross resection is the most important prognostic factor.
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