Xanthogranulomatous transformation of metastatic testicular tumor

A case of testicular tumor with pulmonary metastasis which was transformed into xanthogranuloma is reported. The metastatic lesion was treated first by combination chemotherapy regimen of platinum, vinblastine, and peplomycin, but the pulmonary metastasis did not completely disappear and a segmental resection of the left upper lung including a metastatic nodule was performed. Interestingly, histologic examination of the pulmonary metastasis revealed so-called xanthogranuloma.