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Extensor Digitorum Brevis Manus
Joseph Junewick, MD FACR
over 9 years ago
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Limb Duplication Anomaly

Case Detail

Anatomy: Musculoskeletal
Joseph Junewick, MD FACR
Diagnostic Category: Developmental or Congenital
Created: over 7 years ago
Updated: over 7 years ago
Tags: PEDS
Modality/Study Types: CR MR
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Newborn with protuberant left gluteal mass.

Case Images


Limb Duplication Anomaly


CR – Abdominal radiograph shows an accessory tubular bone in the left gluteal region.

MR – Axial T1 and sagittal T2 images of the pelvis show a rudimentary extremity bone emanating from the left hemipelvis.

CR – Specimen radiograph showing accessory limb comprised of a rudimentary tibia and complete foot.


Limb formation begins at the end of the fourth week of development with the lower limbs slightly later than the upper limbs. The apical ectodermal ridge induces subjacent medodermal differentiation of musculoskeletal tissues. Defective induction may result in absence, hypoplasia or duplication of a limb.


Brower JS, Wooten-Gorges SL, Boakes J, et al. Congenital Diplopodia. Pediatr Radiol (2003); 33:797-799.

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