has part has_part Complete duplication of proximal phalanx of the thumb Duplication of the proximal phalanx of the thumb Partial/complete duplication of the proximal phalanx of the thumb HP:0009613 Complete or partial duplication of the proximal phalanx of the thumb. Depending on the severity, the appearance on x-ray can vary from a notched phalanx (the duplicated bone is almost completely fused with the phalanx), a partially fused appearance of the two bones, or two separate bones appearing side to side. In contrast to the proximal phalanges of the digits 2-5, the proximal phalanx of the thumb is embryologically equivalent to the middle phalanges of the other digits, whereas the first metacarpal is embryologically of phalangeal origin and as such equivalent to the proximal phalanges of the other digits. UMLS:C4021424 2009-01-29T03:59:56Z Bifid proximal phalanx of the thumb Abnormality of the proximal phalanx of the thumb Duplication of thumb phalanx Duplication of the middle phalanx of hand