Attempted bifid distal phalanx of the thumb
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No fracture or dislocation. Incidental well defined ovoid foramen with corticated margins in the center of the thumb distal phalanx represents attempted bifid morphology.
Bifid phalanx represents a congenital abnormality where two separate phalanges develop in one digit. In this case, complete bifid development has not occurred and a small mid-phalangeal foramen remains.
- Theodore Eliot Keats, Mark W. Anderson. Atlas of Normal Roentgen Variants That May Simulate Disease, 9th Ed. (2013) ISBN: 9780323073554