PMC3804811_01
A 4.0x4.5 cm, hard, round, protuberant tumor was found on the right palm.
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On examination, a 4.0x4.5 cm, hard, round, protuberant tumor was found on the ulnar side of the right palm (Figure 1).
The tumor cells had eccentric nuclei and round and deeply eosinophilic cytoplasms with inclusion bodies, displaying a rhabdoid appearance.
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Abundant rhabdoid cells with cytoplasmic inclusion bodies were observed (Figure 2).
Immunohistochemically the tumor cell were positive for S100 and EMA.
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Immunohistochemically, the tumor cells were positive for S-100 protein, GFAP, beta-catenin, and EMA (Figure 3), but negative for cytokeratins (CAM5.2, AE1/AE3, CK 14), alpha-SMA, desmin, HHF35, p63, HMB45, Melan A, MiTF, CD34, HLIB45, glypican 3, and myogenin.