Mucinous cystadenoma of the Thymus presenting as a mediastinal mass in a child

This is the first case report of a mucinous cystadenoma of the thymus. So this case is reported for awareness that mucinous cystadenomas can occur in the mediastinum with a review of literature and the need for complete surgical excision. A twelve year old girl with a cystic mediastinal mass, presented with dry cough for three weeks. The mass was completely excised as it was huge and causing pressure symptoms. On light microscopy, there was thymic tissue with a mucinous cystadenoma. This is the first report of a mucinous cystadenoma in the thymus. Mucinous cystadenomas can grow into large sizes and become symptomatic due to pressure or rupture prompting investigation. Complete surgical excision is advised as mucinous cystadenocarcinoma of the thymus has to be ruled out by adequate sampling and careful analysis of the morphology.