Excerpt
With regard to the hybrid epidermoid and apocrine cyst (1), the bimodal differentiation of a cyst is an interesting finding but eventually appears to more frequent than expected.
Superficial cyst with an epidermoid lining at the upper pole and an apocrine lining at the lower pole is a rather typical feature of "Erosive adenomatosis of the nipple (2)."
Mixed epidermoid and pilar cysts are not rare, when they developed at the level of the sebaceous infundibulum of pilar sheath. For sure there are other possibilities....
Young anatomopathologists not yet used to the infinite span of the pathological structures have to get aware of such a phenomenon.