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FIG 8. Photomicrograph reveals that tumor is composed of densely packed small, round-to-oval cells (lower left) with high nuclear-to-cytoplasmic ratio ("small blue cell tumor;" several representative cells are highlighted with small arrowheads). Tumor has infiltrated medullary space of vertebrae. Note bone spicule (letter A) on right of figure. Faint thin-walled vascular channels are present (outlined by large arrowheads) (hematoxylin and eosin, original magnification x 200). Cells were immunopositve for CD99 and immunonegative for LCA and PGP 9.5. (not shown).
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