has part has part characteristic of inheres in has modifier Pseudoarthrosis Congenital pseudoarthrosis of the clavicle HP:0006612 In congenital pseudarthrosis of the clavicle, the two primary ossification centers fail to unite, probably due to a disruption of diaphyseal membranous ossification. See PMID:22295044, Figure 1, for the radiographic appearance of this feature. SNOMEDCT_US:249685004 SNOMEDCT_US:249690001 The two portions of the clavicle (corresponding to the two primary ossification centers of the clavicle) are connected by a fibrous bridge that is contiguous with the periosteum, and a synovial membrane develops, resulting in a clavicle with a bipartite appearance radiographically. Congenital pseudarthrosis of the clavicle generally presents as a painless mass or swelling over the clavicle. Clavicle pseudoarthrosis UMLS:C0426806 HP:0006585 UMLS:C0426811 Bipartite clavicle Pseudoarthrosis of clavicle HP:0006661 Aplasia/Hypoplasia of the clavicles abnormal clavicle bone