Possible Estrogen Dependency in the Pathogenesis of Branchial Cleft Cysts

Figure 5

Immunohistological staining. (a) Few cells express Ki-67 (40x) in the epithelium of the branchial cleft cyst in a male patient. (b) Complete absence of estrogen receptor alpha expression in the epithelium in the same case (20x).

(a)

(b)