Endometriosis at Cesarean Scar Presenting As an Acute Abdomen.

A 30-year-old female presented to the emergency department with severe abdominal pain and vomitings during her premenstrual period. Abdominal imaging revealed a mass originating from the scar of cesarean section extending into the rectus muscle. The cesarean section was performed four years back. Her history was significant for pain at the site of lesion during menses associated with disproportionate nausea. She was managed conservatively and improved. Fine needle aspiration cytology of the lesion established the diagnosis of scar endometriosis, and there was a permanent resolution of symptoms after its resection.