CT
Axial non-contrast
Axial C+ arterial phase
Axial C+ portal venous phase
Axial C+ delayed
Coronal C+ portal venous phase
The spleen shows a fairly defined mass lesion at its middle pole. It show mild early heterogeneous contrast enhancement (close to the splenic parenchymal enhancement) with progressive enhancement on portal venous showing hypodense hypovascular centre, and further progressive contrast enhancement on delayed imaging with fill in of the central hypodense area.
Diagnostic possibilities included sclerosing angiomatoid transformation of the spleen, hemangioma or hamartoma, however the hypovascular center of the lesion on the portal phase which showed progressive fill in of contrast at the delayed series made sclerosing angiomatoid transformation of the spleen the main possibility here.