All of the following ovarian tumours usually occur bilaterally, except :

Ans. is d i.e. Dermoid cyst "Dysgerminomas are the only germ cell malignancy with a significant rate of bilateral involvement 15 to 20%. Remember : A "Funda"-- Germ cell tumours are unilateral and maximum bilaterality is seen in dysgerminoma amongst germ cell tumour and that too only in 15 - 20% cases. So, the other germ cell tumor will obivously be less bilateral therefore our answer is dermoid cyst.