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Ovarian mucinous cystadenoma

Mucinous cystadenoma of the ovary is at the benign end of the spectrum of mucin containing epithelial ovarian tumours.

Epidemiology

The estimated peak incidence is at around  30-50 years of age. 

They comprise approximately 80% of mucinous ovarian tumours and 20-25% of all benign ovarian tumours.

Pathology

The tumours secrete mucin which fills the locules.

Radiographic features

Mucinous cystadenomas generally tend to be larger than serous cystadenomas at presentation 1. Bilaterality is rare (2-5%).

Pelvic ultrasound

Typically seen as a large cystic adnexal mass with numerous septations. Some of the loculations may contain some internal echotexture due to increased mucin content.

Pelvic MRI

Mucinous cystadenomas are seen usually contain large multilocular cysts containing gelatinous material or fluid of various viscosity. Due to this reason, the loculi of the tumours often show variable signal intensities on both T1 and T2 sequences. This can sometimes give a “stained glass” appearance. They rarely appear as unilocular cysts.

Treatment and prognosis

A mucinous cystadenoma is benign with excellent prognosis. (c.f borderline mucinous tumours of the ovary or mucinous cystadenocarcoma of the ovary).  Nonetheless they are frequently surgically excised for histological confirmation of benignity, and due to mass effect of the large tumours.

See also

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