Hypertelorism-hypospadias-polysyndactyly syndrome

Hypertelorism-hypospadias-polysyndactyly syndrome, also known as HHP syndrome or Opitz-Kaveggia variant syndrome, is an extremely rare congenital malformation syndrome characterized by the combination of widely spaced eyes (hypertelorism), abnormal placement of the urethral opening on the underside of the penis (hypospadias), and fusion or extra digits on the hands and/or feet (polysyndactyly). The condition is present at birth and primarily affects craniofacial structures, the genitourinary system, and the limbs. Additional features that have been reported in some cases include broad nasal bridge, intellectual disability, and other midline developmental anomalies. This syndrome affects multiple body systems during embryonic development, suggesting a disruption in midline developmental pathways. The craniofacial features include ocular hypertelorism and a flat or broad nasal bridge. The limb abnormalities typically involve cutaneous or osseous syndactyly combined with polydactyly (extra digits), most commonly affecting the hands. Genital anomalies, specifically hypospadias of varying severity, are a hallmark feature in affected males. There is no specific cure or targeted therapy for this syndrome. Management is supportive and symptom-based, typically involving surgical correction of hypospadias, surgical separation of fused digits or removal of extra digits, and developmental support services if intellectual disability is present. A multidisciplinary team including geneticists, urologists, orthopedic surgeons, and developmental specialists is generally recommended for comprehensive care. Genetic counseling is advised for affected families.

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