“…So strong has been the hold of traditional thought upon most gynaecologists and gynaecological pathologists concerning the ovarian theca cell tumour, that, even though the thecomas they (Diddle and O'Connor, 1951) were discussing exhibited androgenic propensities, they still classified them under the heading of feminizing ovarian tumours. Yet more and more evidence is accumulating to show that the theca cell tumour is often masculinizing (Traut and Marchetti, 1940;Blackmun, 1942;Stout, 1946;Patton and Patton, 1948;Reycraft, 1949). Such was the case with the tumour herein described (Case 37); a tumour which caused persistent amenorrhoea for more than 34 years and so depressed the uterus that it measured only 14 inches with the uterine sound.…”