Abstract
A 14-year-old, neutered female mixed-breed cat was presented for vaccination. Physical examination revealed the cat had a mass in the ventral cervical region. Blood testing revealed hypercalcemia, increased ionized calcium and intact PTH levels. The mass was removed surgically. Diagnosis of parathyroid adenoma was based on histopathological findings. After surgical treatment, an immediate decrease was observed in all items at an abnormal level. The total calcium level reached the reference range, but ionized calcium and intact PTH levels were slightly outside the range. The cat was diagnosed with chronic renal failure approximately seven months later and treatment is still being provided.
