Abdominal-wall Endometriosis Occurring at the Wound Site after a Caesarian Section

Abstract

A 47-year-old woman underwent caesarian section at the age of 23 and 33. Subsequently, she underwent another operation for an umbilical hernia and abdominal-wall tumor of umbilicus when she was 39 years old. Abdominal-wall endometriosis of umbilicus was diagnosed based on the results of pathological examination. There was no post-operative recurrence. At the age of 44 years, two abdominal-wall tumors with cyclical lower abdominal pain were observed in the lower abdominal region. She presented with pain at our hospital and had a palpable abdominal-wall tumor along the caesarian section scar. Tumors were another legions at the age of 39 years. Contrast-enhanced computed tomography revealed that the two tumors had invaded the rectus abdominis muscle. Both tumors were 35 mm in size. Magnetic resonance imaging revealed blood component into tumors. We suspected abdominal-wall endometriosis based on these findings. Core-needle biopsy was not performed due to the risk of re-implantation and dissemination. Surgical excision was used to remove the tumors along with some surrounding tissues. Pathological analysis revealed that the tumors consisted of endometriosis with glands and endometrial stroma. Approximately 79％ of abdominal-wall endometriosis occurs in the operative scar after a caesarian section. As there are no treatment guidelines, wide excision with normal tissue surrounding the tumor is recommended.