F 65, back
Click the Figs to enlarge
The tumor cells generally demonstrate direct downward growth into the dermis as interconnected basaloid proliferations.
The intraepidermal nests of basaloid cells are smaller than the adjacent keratinocytes and show intercellular bridges.
There are foci of maturation towards ducts characterized by lumen formation surrounded by eosinophilic material over small epithelial cells.
Poroma is a benign adnexal tumor arising from sweat gland (eccrine and apocrine) duct.
Location: Mostly foot and hand.
May be painful.