Partial deletion of chromosome 18 syndrome

Partial deletion of chromosome 18 syndrome (Orphanet code 261836) is a broad category encompassing chromosomal disorders caused by the loss of a segment of chromosome 18. This includes well-recognized conditions such as 18p deletion syndrome (monosomy 18p) and 18q deletion syndrome (monosomy 18q), as well as other partial deletions involving various regions of chromosome 18. The clinical presentation varies considerably depending on the size and location of the deleted segment. Common features across these conditions may include intellectual disability, growth retardation, craniofacial dysmorphism, and variable congenital anomalies. In 18p deletion syndrome, affected individuals often present with mild to moderate intellectual disability, short stature, round face, ptosis, and occasionally holoprosencephaly in severe cases. In 18q deletion syndrome, features frequently include intellectual disability, short stature, hearing loss, hypotonia, foot deformities, white matter abnormalities, and characteristic facial features such as a flat midface and prominent antihelix. Multiple organ systems can be affected, including the central nervous system, musculoskeletal system, cardiovascular system, endocrine system, and sensory organs. There is no cure for partial deletion of chromosome 18 syndromes. Management is supportive and multidisciplinary, tailored to the individual's specific clinical manifestations. This may include early intervention programs, speech and occupational therapy, growth hormone therapy for short stature, hearing aids or cochlear implants for hearing loss, cardiac surgery for congenital heart defects, and ongoing developmental and educational support. Regular monitoring by a team of specialists including geneticists, neurologists, endocrinologists, and audiologists is recommended to optimize outcomes.

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