Biomedical subjects
Publications and source records attributed to Masanobu Eguchi.
A 61-year-old woman complained of a subcutaneous mass in her right knee. MR images revealed a well-defined subcutaneous mass in the prepatellar region, containing some fluid and foci of short T2. The lesion showed some marginal contrast uptake after an administration of meglumine gadopentetate (Gd-DTPA), consistent with prepatellar bursitis. The pathological specimen, however, revealed subcutaneous sarcoidosis involving the bursa.
A 56-year-old Japanese man was admitted to our hospital due to a fever of unknown origin. He had had a history of extranodal natural killer (NK)/T-cell lymphoma, nasal type, and had been in complete remission for 7 years until June 2003, when he developed high fever, eyelid swelling, and muscular weakness. Serum creatine kinase levels were elevated. Histopathological examination of skin and muscle biopsy specimens revealed subcutaneous infiltration of lymphoid cells positive for CD3, CD56, and Epstein-Barr virus-encoded small nuclear RNA-1. We report this unique case of Epstein-Barr virus-associated lymphoma mimicking dermatomyositis.
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A 55-year-old woman complained of a subcutaneous mass in her left buttock. MR images revealed an ill-defined soft tissue mass that crossed the fascia of the gluteus maximus muscle. Some surrounding edema was noted. The lesion showed some contrast uptake after administration of Gd-DTPA. An excisional biopsy revealed sarcoidosis involving both the muscle and subcutaneous tissue across the fascia, mimicking a sarcoma.