Carcinoma de tumor misto da glândula salivar mandibular em um Shih tzu

Abstract

Salivary gland neoplasms in dogs are uncommon in veterinary clinical routine, with adenocarcinomas and carcinomas being the most frequently diagnosed types. Two different cell populations, with a malignant epithelial component and a benign mesenchymal component, characterize mixed tumor carcinoma. This work aims to report a case of a 12-year-old Lhasa apso dog, which presented an increase in volume in the right ventral cervical region. After clinical evaluation, imaging exams were performed, which showed that the mass appeared in the topography of the right mandibular salivary gland, well defined, without invasion of adjacent structures. The animal used Rutina three days before the surgical procedure and underwent right monostomatic mandibular and sublingual sialoadenectomy, right medial retropharyngeal and right mandibular lymphadenectomy. Post-surgery, an active drain was used at the wound site, showing no postoperative complications. The histopathological examination concluded that the mass was a carcinoma in a mixed tumor located in the right mandibular salivary gland, with no signs of metastasis in the removed lymph nodes. An adjuvant chemotherapy or radiotherapy treatment was indicated, but due to the guardians' decision, it was decided not to perform it. The animal remains under oncological monitoring and after 180 days post-surgery, it showed no signs of local recurrence or metastasis.