Figure 1: Representative sections of the small cell carcinoma. A) H & E stained section of biopsy (100 x magnifications) showing nests of small cell carcinoma infiltrating submucosa and squamous epithelium. B) Cell block (400 x magnifications) displaying aggregates of small cell carcinoma intermixed with inflammatory cells. C) Positive immunohistochemical (IHC) stain for pancytokeratin (MAK6) (200 x magnification). D) Positive IHC stain for synaptophysin (200 x magnifications). The tumors cells are also positive for chromogranin and TTF1, but negative for CD45, S100, p63 and CK20 (not shown).