There were 243 histologically proven ovarian tumours seen at the University of Benin Teaching Hospital, Benin-City, from 1973 to 1987. Out of these 198 (81%) were benign, with dermoid cyst (31%) being the commonest benign ovarian tumour. Granulosa cell tumours was the commonest malignant ovarian tumour seen (20% of malignant cases).
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D N Bobzom (1997) studied this question.
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