Skeletal dysplasias: A radiographic approach and review of common non-lethal skeletal dysplasias

Table 5 Differences between Rhizomelic and Conradi-Hunermann type Chondrodysplasia punctata

Rhizomelic/lethal type	Conradi-Hunermann type
Inheritance: Autosomal recessive	Inheritance: X-linked dominant
Symmetric rhizomelic limb shortening	Asymmetric and occasional limb shortening
Stippling in spine absent/coronal clefts present	Spine: stippling present at endplates and bodies, later leads to kyphoscoliosis
Stippling noted in large joints, sparing hands and feet Laryngeal and tracheal cartilage stippling also present	Hands and feet also involved in addition to large joints. No extracartilaginous stippling
Mental retardation present and death in infancy	Compatible with normal intelligence and normal life span