papillary eccrine adenoma

PAPILLARY ECCRINE ADENOMA

There has been some confusion in the literature related to the fact that many cases that had been considered papillary eccrine adenomas were really tubular apocrine adenomas. The conclusion followed that all lesions having some of these features were tubular apocrine adenomas. However, there appears to be a subset of tumors that can be properly classified as papillary eccrine adenoma.

This case shares some of the features with syringomas in that, like some syringomas, the collagen surrounding most of the tubules is very dense. The dense collagen lacks the 'wire wrapped' appearance seen in desmoplastic trichoepitheliomas. The intraluminal papillary projections lack connective tissue cores, and the tubules that contain these papillary projections resemble those occasionally found in obstructed eccrine sweat ducts. Decapitation secretion is not seen, and the granular intraluminal detritus found in many apocrine tubular adenomas is minimal or absent. There may be intraluminal material of the type sometimes found in syringomas. There is no follicular component of the type expected in microcystic adnexal carcinomas.

Scan power view. Note the density of the stroma associated with the tumor compared to the stroma of the deeper reticular dermis.

Higher power. No follicular elements were found in any of the sections. The sections are thick and overstained resulting in some loss of detail. Sorry about that.

Another higher power view.Note the papillary intraluminal projections of epithelial cells. Such projections, and the fact that long tubules are present, help to differentiate this from a syringoma..

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	Scan power view. Note the density of the stroma associated with the tumor compared to the stroma of the deeper reticular dermis.
	Higher power. No follicular elements were found in any of the sections. The sections are thick and overstained resulting in some loss of detail. Sorry about that.
	Another higher power view.Note the papillary intraluminal projections of epithelial cells. Such projections, and the fact that long tubules are present, help to differentiate this from a syringoma..