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Mucinous cystadenoma with fibroma: a rare combination of collision tumour

A collision tumour is defined as the presence of two distinct tumour types without any histological intermixing of the individual cell types. They have been commonly reported in various organs, such as the oesophagus, stomach, skin, lungs, liver, adrenals, thyroid and uterus. It is rarely seen in the ovary (Bige et al. 2009). Mostly the collision is between carcinomas and sarcomas. Rarely it is seen between two carcinomas (Murthaiah et al. 2009). In the ovary, the most frequent combination to be reported is that of a teratoma and mucinous tumours (Bige et al. 2009). Collision tumours of the ovary can present in a wide range of age group between 18 and 66 years. Mostly unilateral, they vary in size from 2 to 200 cm. We here present an extremely rare collision tumour combination of fibroma with mucinous cystadenoma in a postmenopausal female.