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Achondroplasia is the commonest disproportionate dwarfism.
It is inherited as an autosomal dominent. The main feature is a symmetrical proximal limb shortening, rhizomelia, the humeri and femora are particularly affected. Metaphyseal irregularity takes the form of cupping or a 'V' shaped metaphyseal notch. Neurological bladder and hydrocephalus may complicate the axial stenoses. Various anatomic expressions of pathology.