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A cone-shaped appearance of the epiphysis of the distal phalanx of the thumb of the hand, producing a \'ball-in-a-socket\' appearance. This epiphysis is located at the proximal end of the phalanx and is normally nearly flat. The related entity \'angel-shaped\' epiphysis refers to a pronounced cone-shaped epiphysis in combination with a pseudoepiphysis at the distal end of the phalanx. [HPO:probinson]
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