1-day-old baby girl being evaluated for thumb syndactyly with an otherwise normal physical exam.
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Radiographs of left hand demonstrate pre-axial polydactyly with syndactyly/fusion of the two thumbs, which is consistent with thumb duplication. The proximal and distal phalanx are ossified, the proximal phalanx is much smaller. No metacarpal is visualized, consistent with digit duplication.
Radiograph of the right hand is included for comparison.
Polydactyly and syndactyly can be normal variants or may be associated with a syndrome. This case demonstrates a pre-axial (i.e. radial) extra digit, which is the less common than post-axial (i.e. ulnar) polydactyly. The patient had an otherwise normal physical exam, indicating that this was an isolated case and not associated with another anomaly or syndrome.
This case was submitted with supervision and input from:
Soni C. Chawla, M.D.
Department of Radiological Sciences
David Geffen School of Medicine at UCLA
Olive View - UCLA Medical Center
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