PMC4448065_01
a Enhanced CT showing a large solid tumor within the parenchyma of the middle pole of the left kidney. The renal tumor did not indicate an early enhancement and early washout. b Fine-needle biopsy specimen of left renal tumor showing a small round cell tumor on the hematoxylin-eosin staining. c-f Immunohistochemical staining of the fine-needle biopsy specimen showing CD99 (c) was positive and AE1/AE3 (d), desmin (e) and CD45 (f) were negative.
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F1
Enhanced computed tomography (CT), magnetic resonance imaging and bone scintigraphy were performed, and a large solid tumor was found within the parenchyma of the middle pole of the left kidney (fig. 1a). Therefore, a fine-needle biopsy of the left renal tumor was performed and showed a small round cell tumor in the hematoxylin-eosin staining (fig. 1b).