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Abnormalities found in bone scan imaging are characteristically visualized by increased concentration of radiopharmaceutical commonly called a "hot spot". Absence of localization of isotope is referred to as photopenic or a "cold spot". This finding is rare in equine bone scans but if encountered, usually is associated with a space occupying lesion. The sensitivity and specificity of a bone scan is determined by correlating the bone scan with other clinical findings. Sensitivity refers to the number of positive studies divided by the number of patients with proven disease. Specificity is the number of true negative studies divided by the number of patients without disease. Bone scans tend to be highly sensitive and generally non-specific. The following images demonstrate the typical appearance of the following pathologies.
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