A twenty-year-old Senegalese black woman, was admitted with a three-months history of spontaneous abdominal mass associated with a pain. There were no histories of trauma or infection. On examination, there were an abdominal mass in the left hypochondrium and epigastric area. This mass was steady, with a diameter of 20 cm. Hydatid serology was negative and blood formula was normal. Ultrasonography found a voluminous mixed fluid mass without specifying its origin. CT scan found a splenic cyst mass with net lining, regular, without calcifications, without enhancement after contrast injection. Its content was homogeneous liquid without tissue structure. She referred to a splenic cyst with splenic parenchyma remaining below 25%. A median laparotomy found a splenic pseudotumor cyst with a rich vascular area and the persistence of substantial thickness splenic parenchyma encompassing cyst. A total splenectomy was performed. The postoperative care consisted of a vaccination against meningococcus, pneumococcus, and Haemophilus influenzae and antibiotic-based Oracilline. Her progress has been satisfactory. The pathological examination of surgical specimen found a pseudo cyst from resorption of splenic hematoma without an epithelial lining, with a weight of 4100 g.