Pulmonary lymphomatoid granulomatosis in a cat

Pulmonary lymphomatoid granulomatosis was diagnosed in a 9-year-old castrat ed male domestic shorthair cat with a history of coughing, lethargy, and an orexia. Radiographic examination revealed multiple pulmonary opacities, con solidation of left lung lobes, and enlarged tracheobronchial lymph nodes. C ytologic examination of impression smears of abnormal pulmonary tissue reve aled erythrocytes, lymphocytes, and macrophages, with scattered atypical ly mphocytes and binucleate cells. Histopathologic evaluation of abnormal lung tissue revealed multiple, coalescing, densely cellular nodules composed of anaplastic and pleomorphic lymphocytes, with scattered binucleate and mult inucleate cells. Marked infiltration and effacement of bronchiolar and vasc ular smooth muscle were present. These features are characteristic of lymph omatoid granulomatosis. To the authors' knowledge, this is the first report of pulmonary lymphomatoid granulomatosis in a cat.