Pyothorax and pulmonary lymphomatoid granulomatosis in a cat

CASE REPORT Pulmonary lymphomatoid granulomatosis (PLG) is a very rare disease of dogs and humans and only one feline case has been reported. PLG has not previously been associated with pyothorax. A 7-year-old female neutered British Short Hair cat was presented for further investigation and treatment of pleural effusion. Cytology and culture of the fluid identified pyothorax and a large mass/consolidated right caudal lung lobe was found on X-ray, ultrasound and CT scan. Lung lobectomy was performed and a diagnosis of PLG was made (confirmed by histopathology and immunohistochemistry). Despite medical treatment the patient was euthanased because of progression of the disease and deterioration of her clinical signs. CONCLUSION This is the second case of PLG reported in a cat and the first case of PLG with concurrent pyothorax. PLG, despite being very rare, should be added to the list of differential diagnoses for pyothorax and solitary lung masses in cats.