Unplanned Excision in Soft Tissue Sarcoma: Current Knowledge and Remaining Gaps.

Soft tissue sarcoma (STS) is a rare and heterogeneous disease, which can result in surgeons not considering STS as a differential diagnosis when they encounter a lump. However, unplanned excision (UE) often occurs in nonspecialized sarcoma centers. Before re-excision (RE) after UE, radiological examinations such as magnetic resonance imaging (MRI) should be performed to determine the surgical margin and conduct a pathological evaluation of the UE. However, differentiating between residual tumor and postsurgical changes remains challenging because of the presence of postoperative edema, hematoma, and seroma on MRI. Propensity score matching analysis showed that patients with STS who underwent RE after UE did not have higher mortality or local recurrence rates than those who underwent planned excision (PE), while RE often requires reconstruction procedures. From the patient's perspective, one operation (PE) is better than two (UE and RE) because it reduces hospital stays and time away from work. Continuous education about STS is necessary for all surgeons to reduce the incidence of UE.