Merkel cell tumor
Definition: a rare malignant cutaneous tumor seen in sun-exposed skin of elderly patients composed of dermal nodules of small round cells with scanty cytoplasm in a trabecular pattern; the tumor cells contain cytoplasmic dense core granules resembling neurosecretory granules seen in Merkel cells.
Synonym(s): primary neuroendocrine carcinoma of the skin, trabecular carcinoma
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