Effect of unplanned excision of soft tissue sarcomas on skin defects and reconstructive procedures.

Unplanned excision (UE) is defined as a procedure wherein a surgeon operates a tumor resection without appropriate preoperative diagnostic modalities and without the intent to achieve tumor-free margins. Generally, the reconstruction rate after UE is higher than that after planned excision (PE). The present study aimed to investigate how the reconstructive procedure and size of skin defect could be influenced. We reviewed the cases of 442 patients who underwent the resection of soft tissue sarcoma. Patients were stratified into two groups (UE vs. PE). We compared the histologic grade, skin defect, reconstructive procedures, depth of the reconstruction layer. For superficial reconstructions, we also compared procedures involving skin graft-only or flap. 105 cases (23.8%) were UE. Histologic grade in PE was significantly higher (p = .024). The reconstruction rate and size of skin defect in UE was significantly higher (76.2% vs. 27.3%, p < .001) and larger (124.5 cm2 vs. 65.7 cm2, p < .001). The rate of deep layer reconstruction was significantly higher in PE (7.5% vs. 26.1%, p = .001). In superficial reconstructions, 18 (24.3%) skin graft-only procedures were performed in UE and 15 (22.1%) in PE, all other superficial reconstructive procedures involved flap, and there was no significant difference (p = .45). Skin defects were 1.9 times larger after UE than PE. UE did not affect the superficial reconstructive procedure.