Extragonadal endometriosis is rarely diagnosed preoperatively for the variety of its localizations. Presentations to general surgeons may be atypical and pose diagnostic difficulty, mimicking other acute diseases. We report three cases treated with surgical operation. Case 1: a 28-year-old woman admitted for bowel obstruction due to coecal endometriosis, with appendix mucocele, peritoneal pseudomyxoma and ovarian endometrioma. The patient underwent right colectomy and right adnexectomy in the emergency setting. Case 2: a 31-year-old woman with endometriosis of the distal extraperitoneal portion of the round ligament presenting as an irreducible inguinal hernia. An operation was performed: the round ligament and a polycystic structure encompassing it were completely excised. Case 3: a 41-year-old woman, with umbilical endometriosis diagnosed by her gynaecologist, was admitted to our department for excision. Surgical treatment of extragonadal endometriosis is adequate. However, postoperative follow-up is mandatory and hormonal suppressive therapy may be indicated by the gynaecologist.