Adnexal tumor in connection with the epidermis

Papillary projections invaginating into cystic spaces

Adnexal tumor connected to the epidermis

Villous projections surrounded by cystic spaces

Papillae lined by a double-layered columnar epithelium

Inner layer composed of small cells. Outer layer composed of large columnar cells with abundant cytoplasm.

Presence of dilated vessels within the papillae

The center of the papillae contains an infiltrate rich in plasma cells

Papillae lined by a double-layered columnar epithelium

Inner layer composed of small cells. Outer layer of large columnar cells with abundant cytoplasm. (Cutting artifact may give the impression of more than 2 layers)

Presence of dilated vessels within the papillae

The center of the papillae contains an infiltrate rich in plasma cells

Papillae lined by a double-layered columnar epithelium

Inner layer of small cells. Outer layer of large columnar cells with abundant cytoplasm

Presence of dilated vessels within the papillae

Plasma cell–rich infiltrate in the core of the papillae

Papillae lined by a double-layered columnar epithelium

Center of the papillae filled with a plasma cell–rich infiltrate

Papillae lined by a double-layered columnar epithelium

Abundance of plasma cells in the center of the papillae

Apocrine secretion

Decapitation/fragmentation of the apical pole

The columnar cells of the outer layer exhibit a prominent apical pole, which detaches from the rest of the cell during secretion