“…Dockerty (1954) believed that Brenner tumours represent teratomas because of their frequent association with pseudo-mucinous cystadenomata. Plaut (1933) related their origin to inclusions of the germinal epithelium in the ovarian stroma. Teoh (1953), in a detailed study of 16 Brenner tumours, came to the conclusion that both Brenner and granulosa cell tumours are of follicular origin and may retain their secretory function and affect the endometrium.…”