A punção aspirativa por agulha fina como ferramenta diagnóstica de tumor de células melanocíticas em cavalo tordilho

Melanocytic cell tumors, commonly known as melanomas, are frequently observed in grey horses, especially in older animals. These tumors can range from benign to malignant and are often diagnosed in areas such as the base of the tail, perineum, lips, and parotid glands. Fine-Needle Aspiration (FNA) has proven to be a valuable diagnostic tool in the evaluation of neoplasms, allowing for the collection of tumor cells for cytological analysis in a minimally invasive and cost-effective manner for many owners. This case report describes the use of FNA in diagnosing a benign melanocytic tumor in a 15-year-old grey horse that presented a subcutaneous mass in the submandibular region, as well as formations at the base of the tail and lips. After collecting the material via FNA, the samples were subjected to cytological analysis, where no malignancy criteria were observed. Since surgical intervention and histopathological evaluation were not opted for, treatment with Cimetidine was initiated to reduce the tumor masses. The application of FNA proved to be an efficient and practical technique in obtaining diagnostic material, allowing for early tumor identification and aiding in the clinical management of the patient. This report reinforces the importance of FNA as a diagnostic tool in veterinary medicine, especially in cases of cutaneous neoplasms in horses, where quick and accurate interventions are essential for successful treatment.