Laparoscopic treatment of a solitary fibrous tumor of the greater omentum presenting as spontaneous haemoperitoneum.

A 24-year-old man was admitted at the emergency department with a lower quadrant abdominal pain and a slight hypoglycaemia. Abdominal ultrasonography showed the presence of a fluid peritoneal collection and a 3.2 x 2.5 cm hypoisoechogenic mass closed to the left iliac vessels with an echo-color-Doppler pattern similar to that of a hamartoma. CT examination confirmed the hypothesis of a vascular tumour. Although an abdominal angiography added no new information to establish a preoperative diagnosis, it showed a well vascularized mass. The patient underwent laparoscopy that revealed a bleeding mass of the great omentum. Laparoscopic stapled resection of the greater omentum was carried out. The solid lesion consisted of spindle-shaped cells, but no atypical cells were observed. The histological findings were diagnostic of a benign solitary fibrous tumor, an extremely rare neoplasm for a long time considered to be an exclusively thoracic lesion. This is the first case of a solitary fibrous tumor presenting as haemoperitoneum and the first time it was removed laparoscopically. The patient is disease-free at the 2-year follow-up.