An asymptomatic patient undergoes sonography for possible engagement of the spleen on physical examination. The sonogram reveals a splenic length of 11.6cm and a 1.5cm round hyperechoic nodule in the superior aspect. These findings are most likely consistent with which of the following?
A. Accessory spleen
B. Hemangioma
C. Angiosarcoma
D. Hamartoma
E. Splenomegaly