Isolated lymphangiomatosis of the spleen is rare. When present, it is usually considered to be accompanied by splenomegaly. We describe a case of cystic lymphangiomatosis in a patient with a normal-sized spleen. While ultrasound, angiography and computed tomography are considered to complement each other in reaching a preoperative diagnosis of splenic lymphangiomatosis, in the present case, magnetic resonance imaging proved to be an additional helpful non-invasive diagnostic method.