2018 ACVIM Forum Research Abstract Program: Seattle, Washington, June 14 - 15, 2018

Thirty-two cats were included in the study. Mean cat age was 13.3 ± 2.4 years and mean cat body weight was 4.9 ± 1.3 kg. iCa was above reference range in all cats (median 1.8 mmol/L (IQR 1.5,1.9)). All cats underwent cervical exploratory surgery and abnormal tissue was identified and removed in all cats. Histopathologic diagnosis was parathyroid adenoma in 20/32 (62.5%) cats, parathyroid endocrine carcinoma in 7/32 (21.9%) cats, parathyroid hyperplasia in 3/32 (9.4%) cats, and parathyroid cystadenoma in 2 (6.3%) cats. At discharge, 6/32 (18.8%) cats had hypercalcemia, 5/32 (15.6%) had hypocalcemia, and 21/32 (65.6%) cats had iCa within reference range. Overall median survival time was 1109 days (95% CI 856 -1332). Survival time was not significantly associated with pre-operative iCa group (p = 0.139), hypocalcemia at discharge (p = 0.326), hypercalcemia at discharge (p = 0.955), or diagnosis of carcinoma (p = 0.930).