A Feline Case of Primary Hyperparathyroidism with Palpable Cervical Mass

Abstract

A 16-year-old castrated male mixed breed cat was presented for anorexia and weight loss. On physical examination, the cat had a palpable mass in the left ventral cervical region. Blood test revealed hypercalcemia, increased ionized calcium. Intact parathyroid hormone (PTH) was higher than the reported range in healthy cats with experimentally induced hypercalcemia, suggesting that PTH suppression corresponding to serum ionized calcium concentration had been disrupted. The cervical mass was removed surgically and diagnosed as a parathyroid chief cell adenoma on histopathological examination. After surgical treatment, serum total calcium and ionized calcium decreased to within normal immediately and there was no recurrence after 2 years.