Primary splenic angiosarcoma is rare. A 44-year-old man presented with abdominal distension and malaise for 7 months. Laboratory tests showed anemia. Abdominal ultrasound showed enlargement of the spleen with multiple hypoechoic nodules. These nodules showed progressive enhancement on dynamic enhanced CT. Lymphoma was suspected. FDG PET/CT showed increased nonuniform FDG uptake with SUVmax of 11.6 of the entire spleen. Laparoscopic splenectomy was performed. The pathologic findings were consisted with angiosarcoma with replacement of the spleen. Eight months after surgery, multiple hepatic metastases were detected by follow-up abdominal CT.