Thoracomelic dysplasia

Thoracomelic dysplasia (also known as short rib-polydactyly syndrome or thoracic-pelvic-phalangeal dystrophy, depending on the specific subtype) is a rare skeletal dysplasia characterized by a narrow, constricted thorax (chest) and limb abnormalities. The ICD-10 code Q77.2 corresponds to short rib syndrome, which encompasses a group of lethal and non-lethal skeletal conditions featuring a markedly small thoracic cage and shortened limbs. The narrow chest restricts lung development and expansion, leading to respiratory insufficiency, which is the primary cause of morbidity and mortality, particularly in severe neonatal forms. The condition primarily affects the skeletal system, with key features including short ribs, a small thorax, shortened long bones (particularly of the limbs), and in some subtypes, polydactyly (extra fingers or toes). Pelvic abnormalities and other skeletal malformations may also be present. The severity varies considerably depending on the specific subtype, ranging from lethal perinatal forms to milder presentations compatible with survival into childhood or adulthood. Treatment is largely supportive and symptomatic. In severe neonatal cases, intensive respiratory support is critical. For patients who survive the neonatal period, management may include thoracic expansion surgery (such as vertical expandable prosthetic titanium rib procedures) to improve chest volume and lung growth, orthopedic interventions for limb abnormalities, and multidisciplinary follow-up. Genetic counseling is recommended for affected families. There is currently no curative therapy for the underlying skeletal dysplasia.

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