Monarch Disease Ontology identifier MONDO_0011620 (metaphyseal dysplasia, Braun-Tinschert type) is characterized by metapyhseal undermodeling with broadening of the long bones and femora with an 'Erlenmeyer flask'' appearance, expansion and bowing of the radii with severe varus deformity and flat exostoses of the long bones at the metadiaphyseal junctions.