Malignant transformation of endometriosis in a cesarean section abdominal wall scar: a case report.

BACKGROUND: Endometriosis occurring in a cesarean section abdominal wall scar is reported at a rate of 0.03-0.45%. Malignant transformation of this type of endometriosis is exceptionally rare. CASE: A 51-year-old, G3P2012, Black woman presented with a lump in her cesarean section abdominal wall scar that was increasing in size. Biopsy of the mass revealed metastatic adenocarcinoma with poorly differentiated, nonmucinous ovarian primary. She received 3 cycles of neoadjuvant chemotherapy and underwent an interval debulking with the final pathology showing malignant transformation of endometriosis within her abdominal wall scar. She then completed radiotherapy to the area and is disease-free 6 months later. CONCLUSION: Our combination of neoadjuvant chemotherapy and excision of the mass with negative margins followed by adjuvant radiotherapy is a feasible treatment option.