Parenchymal pulmonary lipoma in a dog: Imaging findings, surgical treatment and long‐term outcome

A 13‐year‑old, neutered, male, mixed‑breed dog was presented for the evaluation of a large pulmonary mass identified on thoracic radiographs by the primary veterinarian. Thoracic and abdominal computed tomography was offered and performed for staging. Computed tomography revealed the presence of a 5‐cm fat‐attenuating pulmonary mass with secondary mainstem bronchi compression and atelectasis of the left caudal lung lobe. The cytology of the lung mass was consistent with adipose tissue. The patient underwent surgery via left intercostal thoracotomy, and a left caudal lung lobectomy was performed. The mass was confirmed to be an intraparenchymal lipoma on histopathology. The dog's postoperative recovery was uneventful, and thoracic radiographs at 12 months post‐operation showed no recurrence of the mass. Intraparenchymal pulmonary lipomas are rarely reported benign tumours that should be considered as a differential diagnosis for pulmonary masses.