Brain Abscess Developed Five Years after Splenectomy in a Patient with Idiopathic Thrombocytopenic Purpura

The increased susceptibility to infection following splenectomy has been well documented. We report here, a case of brain abscess developed five years after splenectomy in a patient with idiopathic thrombocytopenic purpura (ITP). A 65-year-old woman was admitted to our hospital because of fever, mental disorientation, and weakness in August, 1999. She had been followed with diagnoses of essential hypertension and type 2 diabetes mellitus (DM) since 1988. The patient was diagnosed as having ITP in 1992, and then underwent splenectomy in 1994. Monoclonal gammopathy of undetermined significance (MGUS) of IgG, lambda type was found in February 1999. Though high grade fever persisted after admission, blood cultures were negative. Antibiotics were given without a satisfactory effect. Right hemiparesis and worsening of consciousness developed subsequently. Contrast enhanced cranial computed tomography (CT) disclosed a ringed enhanced low density mass in the left parieto-occipital lobe compatible with a diagnosis of brain abscess. Surgical drainage was performed and 20 ml of pus was obtained. No primary infectious focus of the brain abscess was detected with intensive examinations.