Large Encapsulated Apocrine Papilloma of the Breast Lacking Myoepithelial Markers: Case Report With Clinicopathologic and Immunohistochemical Studies.

Encapsulated apocrine papilloma of the breast without myoepithelial cell markers is a rare occurrence. For its diagnosis, histopathological examination shows encapsulated apocrine papilloma lacking myoepithelial cell markers. To the best of our knowledge, this is the first documented case of an encapsulated apocrine papilloma entirely devoid of myoepithelial cell markers.