Tumoral calcinosis in the horse

Abstract

The condition of tumoral calcinosis in horses is reviewed. Although only eighteen cases have been described in the available literature it is suggested from the authors' limited observations that the condition is perhaps more common than is generally realised. Incident trends with respect to age, sex and breed are not well established but the swellings typical of the condition mostly occur on the lateral gaskin close to the stifle joint. Radiographic and pathological appearance is characteristic. The aetiology in the horse is unclear although low grade repetitive trauma cannot be discounted. Moreover evidence from some human cases suggests a link exists between tumoral calcinosis and disturbances of Ca/P metabolism induced by Vitamin D therapy. Surgical removal of the lesions appears to be indicated only in cases with clinical complications.