Fig. 2
From: Primary Ewing sarcoma of renal origin with tumor thrombus into inferior vena cava: a case report
Microscopic examination of hematoxilin and eosin sections shows: (A) sheet-like diffuse infiltration of neoplastic cells (40X); (B) the neoplastic cells are rather uniform with small round nuclei, inconspicuous nucleoli, scant cytoplasm, and occasional mitosis (400X); C scattered Homer Wright pseudorosettes are evident (400X). Immunohistochemistry study revealed (D) dot-like staining with CK AE1/AE3; (E) positive nuclear reaction with NKX2.2; (F) diffuse membranous staining with CD99; and (G) negative staining with TLE1