part of part of has part has part characteristic of inheres in has modifier Abnormality of the epiphysis of the proximal phalanx of the thumb Irregular epiphysis of the proximal phalanx of the thumb 2009-01-30T09:17:13Z HP:0009669 Irregular radiographic opacity of the epiphysis of the proximal phalanx of the thumb. 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. Irregular end part of thumb innermost long bone UMLS:C4024248 Irregular thumb epiphysis Irregular epiphyses of the middle phalanges of the hand abnormal irregular density proximal phalanx of manual digit 1 epiphysis of phalanx of manus