Primary pulmonary histiocytic sarcoma with nodal and esophageal metastasis in a dog—imaging and anatomopathological aspects

The involvement of cranial mediastinal and tracheobronchial lymph nodes, as well as the presence of pleural effusion, are common features associated with HS. However, the occurrence of esophageal metastases is considered uncommon, highlighting the uniqueness of this case, as well as supporting the potential for its occurrence. Thoracic radiography and ultrasonography played a crucial role in the initial suspicion of neoplasia, emphasizing their importance in early diagnostic approaches.