A 10 yr old female cat presented for an acute onset of back arching, regurgitation, and open mouth breathing. Radiographs indicated the presence of a large intrathoracic mass. Computed tomography confirmed the presence of a large mass of fatty density in the dorso-caudal mediastinum. The mass was removed via right intercostal thoracotomy, and histopathology confirmed the mass as a lipoma. The cat was continuing to recover well as of 21 mo after surgery. This is the first reported case of an intrathoracic lipoma in a cat.

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