Subcapsular splenic hematoma due to infectious mononucleosis.

Spontaneous subcapsular splenic hematoma formation without rupture in infectious mononucleosis is a very unusual occurrence. A conservative management is successful in those patients in stable condition. We describe the presentation and the clinical progress of a case in whom a sudden enlargement in hematoma's diameter needed a splenectomy to avoid the risk of blood effusion in the abdominal cavity.