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A Poroid Neoplasia Arising Close to a Seborrheic Keratosis and a Trichoepithelioma
Author(s) -
Nagore Eduardo,
Díaz Felipe,
SánchezMotilla José M.,
Prats Amelia,
GarcíaCastell Julia,
Aliaga Adolfo
Publication year - 1999
Publication title -
the journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 65
eISSN - 1346-8138
pISSN - 0385-2407
DOI - 10.1111/j.1346-8138.1999.tb03467.x
Subject(s) - trichoepithelioma , seborrheic keratosis , dermatology , medicine , pathology , basal cell , basal cell carcinoma
A 69‐year‐old woman had a well‐defined, slightly raised, brownish, keratotic plaque with an excentric group of roughly circular, bluish, dome nodules on her right scapular area. Histological study revealed the presence of an eccrine poroma demonstrating features of eccrine poroma, hidroacanthoma simplex, and dermal duct tumor and arising in a lesion of seborrheic keratosis and a trichoepithelioma. In the eccrine poroma region, an area with malignant changes was evident. The findings in this case support the view of eccrine poroma as a spectrum of histological variants and the possibility of malignant transformation from a eccrine poroma towards porocarcinoma. The association with seborrheic keratosis is most probably coincidental, and the trichoepithelioma was probably due to induction of the tumoral stroma on adjacent follicular epithelia.