Pulmonary teratoma masquerading as aspergilloma

Pulmonary teratomas are extremely rare extragonadal neoplasms. As the clinical features are non-specific, the diagnosis rests on the radiological findings. The characteristic computed tomography (CT) findings of a teratoma in the lung include heterogenous lobulated mass containing soft tissue, fat, fluid, and/or calcification. However, at times these distinctive findings may be absent and the diagnosis is revealed only after surgery. We report a case of intrapulmonary mature teratoma in a patient where the preoperative diagnosis of aspergilloma was considered based on the imaging findings. We discuss some imaging findings that may help differentiate intra-pulmonary teratoma with aspergilloma. We also present a review of all published cases where teratoma mimicked as some other pulmonary lesions.