Subcutaneous canine cervical transmissible venereal tumor associated with partial pharyngeal obstruction

Abstract

ABSTRACT: Canine transmissible venereal tumor (cTVT) is a contagious neoplasm that commonly affects the genital region of free-roaming dogs in endemic areas. It has metastatic potential, and infiltration into adjacent tissues may occur. However, the lymphocytoid subtype is the least common and is rarely associated with aggressive clinical presentations. This report described a case of lymphocytoid cTVT located in the subcutaneous cervical region, with extensive infiltration of soft tissues-including muscles, the soft palate, and the gingiva. This resulted in lateral displacement of the trachea, partial obstruction of the larynx and pharynx, and aspiration pneumonia. A three-year-old neutered dog with street access presented with a one-month history of a cervical mass, dysphagia, hyporexia, progressive weight loss since the mass onset, and episodes of oral bleeding. Physical examination revealed oropharyngeal infiltration with partial airway obstruction. Diagnosis was confirmed through cytology and biopsy of the mass, along with thoracic radiographs that showed evidence of aspiration pneumonia and tracheal displacement. The dog was treated with a chemotherapy protocol combining vincristine and doxorubicin, alongside supportive care for aspiration pneumonia, resulting in complete clinical resolution.