We report the case of a 59-year-old man who presented with classical-type fever of unknown origin (FUO) during observation of hypertension and polycystic kidney. The presence of malignancy was suspected based on elevation of tumor marker levels. We examined the patient carefully and attempted diagnostic imaging, but definitive diagnosis was difficult due to the presence of multiple hepatic cysts. Hepatic biopsy detected adenocarcinoma, but identifying whether lesions were primary cholangiocellular carcinoma or metastases was difficult, and we were ultimately unable to diagnose the tumors as cholangiocellular carcinoma until autopsy. Polycystic kidney with hepatic cysts and complicated by cholangiocellular carcinoma is rare, but should be considered among the differential diagnosis for FUO, which itself is frequently encountered.

We recently encountered a case of fatal pneumococcal infection in a previously healthy 19-year-old female. She had no history of splenectomy, but on autopsy she was found to have hyposplenism. It has been widely reported that life-threatening pneumococcal infection can occur after splenectomy, though cases of hyposplenic or asplenic adults, without a history of splenectomy, are very rare. We report this case and review the literature dealing with 6 similar cases.

ABSTRACT: A case of infectious mononucleosis (IM) in a previously healthy 43-year-old male is presented. The patient complained of fever and a sore throat of 3 weeks' duration. Although blood tests showed a marked increase in atypical lymphocytes, tests for Epstein-Barr virus (EBV) and cytomegalovirus (CMV) were negative. Human immunodeficiency virus type 1 (HIV-1) antibody was positive on enzymelinked immunosorbent assay (ELISA), and the HIV-1 viral load was 6.4×10⁴copies/mL. Western blot (WB) analysis did not initially confirm HIV-1 infection ; however, HIV-1 infection was confirmed one month after presentation. Although several pathogens can cause infections presenting as IM, in Japan there have been few reports of acute retroviral syndrome presenting as IM. This case is being reported to stress the importance of the early diagnosis of acute retroviral syndrome.