CALCINOSIS CIRCUMSCRIPTA AND RENAL DYSPLASIA IN A DOG

A young Lhasa Apso was presented with lameness, resulting from calcino sis circumscripta of the metatarsal and metacarpal pads. Renal failure was detected by analysis of serum chemistry; concurrent hypercalcaemi a and hyperphosphataemia were present. Renal dysplasia was evident upo n post-mortem examination. Calcinosis circumscripta was a likely manif estation of metastatic calcification. Because soft tissue calcificatio n in renal failure may be partly dystrophic in nature, pawpad involvem ent in this dog may have resulted from conformational stresses that al lowed damage to these,tissues. This is the first report of calcinosis circumscripta associated with canine renal dysplasia.