Histologic quantitation of leukocytes in biopsies of recurrent aphthous ulcers revealed at least two morphologically-distinct inflammatory infiltrates. Lymphocytes were found consistently in pre-ulcerative lesions and in the expanding margins of the developing ulcer. In contrast, polymorphonuclear leukocytes predominated only in areas of frank ulceration.

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A rare primary adenocystic carcinoma (cylindromatous carcinoma) of the esophagus, removed at autopsy from a 72‐year‐old Caucasian man, is described in histologic detail. Only eight previous cases have been reported. The tumor was highly aggressive although morphologically identical to the salivary gland cylindroma.

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