There are similarities between clear cell epithelial ovarian carcinoma
and endodermal sinus tumors. Apart from the morphological and clinica
l characteristics there are immunohistochemical markers of value in di
fferentiating these 2 tumours and the detection of a raised serum AFP
is characteristic of endodermal sinus tumours. These 3 cases we descri
be show the fallibility of the classical differentiating criteria betw
een these two tumours.