The disappearance of the soft tissue between the digital rays results in the formation of fingers. Surgery is rarely indicated with this type of abnormality. Surgical correction entails centralization of the remaining hand on the access of the remaining forearm bone. B. Failure of Differentiation of Parts. The most common example of soft tissue differentiation abnormality is syndactyly.
Simple syndactyly is a fusion of only the soft tissue components of two digits.
With complex syndactyly, there is a fusion of the bones in addition to the overlying soft tissue. Symphalangia is a fusion, or a failure of separation of the phalanges in the digit. Other neoplastic conditions can affect the differentiation of the tissues of the limb. These include hemangioma and lymphangioma. The most common example of duplication is polydactyly.