The tumors that arise from the head and neck region characteristically exhibit nests of cells with a lace-like stranding pattern of epithelial cells and tubuloalveolar
structures in a loose myxochondroid stroma, with a differentiation pattern of sweat glands and ducts.
Lactating adenomas are characterised by glands with a tubuloalveolar
architecture and florid secretory features.
Histologically, the tumors contain varying amounts of: nests of cuboidal/polygonal cells, tubuloalveolar
structures, ductal structures, keratinous cysts and matrix (chondroid substance is the most prevalent).
In each case with seminal vesicle epithelium, the secretions were evaluated for the following characteristics: location of secretion (central seminal ductal region vs peripheral tubuloalveolar
glands) and predominant morphologic type (dense platelike, fluidlike, and crystalloid morphology).
Twenty or thirty long tubuloalveolar
glands connect the acini to the urethra.