Today’s case is a 7 year old female neutered Bernese Mountain Dog with cervical mast cell tumor. What is your top differential diagnosis?
There is a well-defined, lobular soft tissue opacity with air bronchograms in the right middle lung lobe. There is a more poorly defined alveolar pattern in the caudal subsegment of the left cranial lung lobe. There is also a mild, diffuse bronchointerstitial pattern present throughout the lungs. The cardiovascular structures, mediastinum, and pleural space appear normal.
- Right middle lung lobe mass most consistent with histiocytic sarcoma
- Left cranial lung lobe may also represent neoplasia, or alternatively pneumonia
Histiocytic sarcomaâ€”diagnosed by fine needle aspirate of the lung mass.