Classifications of radiopaque lesions of the tendo Achillis.

The authors present an anatomically-based classification to identify radiopaque lesions of the tendo Achillis. Numerous etiologic and pathologic processes are responsible for the formation of radiopaque lesions found in this tendon. The anatomical location and morphologic appearance of the lesions are represented in this classification system to better acquaint the physician with reported etiologic causes. Treatment based upon classification sites are discussed to complete this historical presentation.