0009618 Abnormality of the proximal phalanx of the thumb	0009657 Triangular shaped thumb phalanx	0009850 Triangular shaped middle phalanges of the hand	0009858 Triangular shaped proximal phalanges of the hand
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0009636 Triangular shaped proximal phalanx of the thumb

synonym

Triangular proximal thumb phalanx

Triangular innermost thumb bone