Soft-tissue sarcoma resection

Any mass in the soft tissues that grows, measures more than a few centimeters or sits deep must be worked up before being operated on, even if it does not hurt. Many sarcomas are discovered as a painless lump that keeps enlarging.

Removing one of these masses without a prior diagnosis (a "just in case" resection) can contaminate the tissues and complicate the definitive treatment. That is why the workup always comes before the scalpel. If a mass has already been removed without a prior diagnosis and turns out to be a sarcoma, not all is lost: the usual course is referral to a specialist team, repeat imaging and, in most cases, re-operating the area with adequate margins.

The case is studied with imaging (usually MRI) and a well-planned biopsy, and is discussed at a sarcoma board to define the treatment sequence. Staging includes a chest CT, since the lung is the most common site of metastasis.

Radiotherapy is the usual complement to surgery for high-grade sarcomas, especially when deep and larger than 5 cm, and also when the margin obtained is insufficient; in low-grade tumors, or small superficial tumors, when they are removed with a wide margin, it is often not needed. In selected cases —deep, large, high-grade tumors, or subtypes that respond well to drugs— the board may also indicate chemotherapy, before or after the operation. Chemotherapy is not part of the treatment of every soft-tissue sarcoma, which is why the decision is taken case by case.

The resection removes the tumor surrounded by a layer of healthy tissue —the margin— so the scalpel never touches the tumor directly. When a prior biopsy was performed, its tract is removed en bloc together with the tumor. Achieving an adequate margin is the factor that most influences preventing the tumor from returning at the same site.

The challenge is to achieve that margin while preserving the limb and as much function as possible, sparing neighboring vessels, nerves and muscles where possible. Radiotherapy is often integrated, before or after surgery, to reduce the risk of local recurrence. The sequence is chosen case by case: giving it before surgery treats a smaller volume and can make the resection easier, at the cost of more wound-healing problems; giving it afterwards avoids that, but requires irradiating a larger field and leaves more long-term stiffness and fibrosis. Soft-tissue reconstruction may require flaps or grafts to close the defect and cover structures.

After treatment, prolonged follow-up is maintained with clinical checks and imaging of the operated area and of the chest, because both local recurrence and metastasis can appear over time and are treated best when detected early.

The decision to operate is made together: we discuss the diagnosis, the goals of treatment, the expected benefits, the risks and the alternatives. Surgery does not guarantee an outcome; it aims to control the tumor while preserving as much function as possible.