Unusual hyperparathyroidism in a cat

A 5 month-old, male, domestic short hair cat was presented with inappetence and vomiting. it was depressed and reluctant to move. The cat had difficul ties in keeping the standing position and grossly deformed thighs. Lytic ch anges and disruption of normal architecture of the bone were observed, invo lving mainly the femoral diaphyses. An inverse Ca/P ratio and kidney failur e were diagnosed. The possibility of whether the bone changes could have be en related to primary or secondary renal hyperparathyroidism is discussed.