Linfoma ocular primário em cão: relato de caso

Abstract

Lymphoma is a malignant lymphoid neoplasm that most commonly affects middle-aged or elderly dogs. Its primary manifestation in the eye is considered rare. This study aims to report a case of primary ocular lymphoma with metastasis to the stomach, lymph nodes, and skin in a seven-year-old mixed-breed dog. The animal was treated at the Veterinary Hospital of the Federal University of Paraíba (UFPB), presenting with changes in the anatomical structure and function of the left eye. In light of this condition, enucleation was performed, and the collected material was sent to the Histopathology Laboratory of UFPB. Histopathological examination revealed a malignant neoplastic process originating from the proliferation of lymphocytes with metastatic potential, confirming the diagnosis of lymphoma. Subsequently, the animal developed a nodule on the flank, and fine needle aspiration cytology (FNAC) was performed. Microscopic analysis revealed the same population of lymphocytes found in the ocular globe, confirming metastasis. Additionally, an abdominal ultrasound was performed, which suggested the presence of a gastric neoplastic infiltration. As the condition progressed to an irreversible state, euthanasia was chosen. Necropsy revealed the presence of the same lymphocytic population observed in the ocular bulb in the stomach, lymph nodes, and skin. The report of primary ocular lymphoma in dog is relevant due to its rarity and resemblance to other diseases. The diagnosis was confirmed by histopathological and cytological exams, revealing an aggressive tumor with metastatic potential to the stomach, lymph nodes, and skin.