of Cases I Epithelial Tumours (N=340) Percentage 1 Serous Cystadenoma 160 47.05 % 2 Serous cystadenofibroma 18 5.2 % 3 Serous cystadenoma of 2 0.5% borderline malignancy 4 Serous cystadenocarcinoma 4 1.1% 5 Mucinous cystadenoma 64 18.8% 6 Mucinous cystadenoma of 10 2.9% borderline malignancy 7 Mucinous cystadenocarcinoma 2 0.5% 8 Brenner tumour
4 1.1% 9 Endometriotic cyst * 60 17.6% 10 Endometrioid Carcinoma 16 4.70% Total 340 100% Table 4.
 Common combinations with ovarian tumours include mucinous cystadenoma and a combination of Brenner tumour
, mature cystic teratoma, Sertoli-Leidig cell tumour may be seen.
Further subtyping and histopathological analysis of these 4 major ovarian tumour categories is as follows: Out of the 38 surface epithelial origin cancers, 18 (29.51%) cases were serous cyst adenocarcinomas, 14 cases (22.95%) were mucinous cystadenocarcinomas, 4 cases (6.56%) were endometrioid cancers and there was 1 case (1.64%) each of malignant Brenner tumour and mixed mullerian tumour (Table 4).
Other less common ovarian cancers included papillary cyst adenocarcinoma (3 cases), clear cell carcinoma (2 cases) and malignant Brenner tumour (2 cases).
Benign Brenner tumour observed in the present study was an incidental finding coinciding with the findings in literature.
Proliferating Brenner tumour of ovary-a rare entity.
TCC of the ovary is defined as ovarian tumours presenting with histologic features similar to those seen in a malignant Brenner tumour, but lacking the associated benign Brenner tumour component.
Malignant brenner tumour and transitional cell carcinoma of the ovary: a comparison.
BRENNER TUMOUR (FIGURE 3): Among the remaining epithelial tumours, 1(2%) case of malignant Brenner tumour was found in our study.
One case each of clear cell adenocarcinoma and malignant Brenner tumour were also found in the present study.
In one study the differential diagnosis of a calcified adnexal mass usually include a degenerative uterine or intra-ligamentous myoma of an ovarian tumour such as fibrothecoma, Brenner tumour
and mature or immature teratoma .
(2) Subtypes of epithelial tumours include serous, mucinous, endometrioid, clear cell, Brenner tumours
and mixed types.