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Polydactyly

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Polydactyly

Elliot K. Fishman, MD
Director of Diagnostic Imaging and Body CT, Professor of Radiology and Radiological Science, Johns Hopkins
Karen M. Horton, MD
Professor and Interim Chair, Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins
 
 

This is a patient who was noted to have a deformity of the foot after birth. Frontal and lateral radiographs of the foot were obtained. The frontal radiograph demonstrates 6 rays, with an additional digit arising from the fifth ray. This is known as postaxial polydactyly. Although the findings of an extra ray is apparent to the clinician on clinical examination, radiographs are important to determine the number of phalanges that are associated with the supranumery digit and to determine if there any other osseous anomalies of the foot. The lateral radiograph shown here demonstrates that there are no assoicated abnormalities in the midfoot or hindfoot.