Hinyokika kiyo. Acta urologica Japonica
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Review Case Reports
[A case of chronic expanding hematoma with xanthogranuloma in retroperitoneal space].
Chronic expanding hematoma (CEH), which is defined as persistent hematoma manifesting as enlarging space-occupying mass, rarely occurs in the retroperitoneal space. Here, we report a case of retroperitoneal CEH with xanthogranulama. A 72-year-old man with a history of genuine polycythemia was admitted for idiopathic renal subcapsular hematoma 3 years ago. ⋯ Microscopic findings showed that the hematoma capsule consisted of collagenous tissue with chronic inflammatory infiltrate and foreign-body granuloma with foam cells and giant cells. The final diagnosis was CEH with xanthogranuloma. Our case suggests that early resection for retroperitoneal CEH may be desirable to avoid severe adhesion and invasion around the capsule.