%0 Case Reports %T Mucinous cystadenoma in the lung of a captive-born moustached tamarin (Saguinus mystax). %A Michaud CR %A Ragland DR %A St Claire MC %A Elkins WR %A Gozalo AS %J J Comp Pathol %V 149 %N 2 %D Aug-Oct 2013 %M 23356933 %F 1.083 %R 10.1016/j.jcpa.2012.12.001 %X A 2-year-old, captive-born, male moustached tamarin was subjected to necropsy examination after a fatal head trauma. A solitary, circumscribed, subpleural mass (0.6 cm diameter) was found in the right caudal lung lobe. The mass was diagnosed as a mucinous cystadenoma. Histochemical and immunohistochemical tests were performed to further characterize the tumour. Surfactant proteins A, B, C and D were not found in the neoplastic cells, suggesting that the tumour arose from a non-surfactant-producing alveolar lining cell. Pulmonary mucinous cystadenomas are uncommon benign tumours in man and have not been reported previously in animals.