Partial deletion of the long arm of chromosome 11 syndrome

Partial deletion of the long arm of chromosome 11 syndrome (also known as 11q partial monosomy or partial monosomy 11q) is a rare chromosomal disorder caused by the loss of a segment of genetic material from the long arm (q arm) of chromosome 11. The clinical presentation varies considerably depending on the size and precise location of the deleted segment. This condition can affect multiple body systems, including the nervous system, musculoskeletal system, cardiovascular system, and craniofacial structures. Common clinical features may include intellectual disability of variable severity, developmental delay, growth retardation, and distinctive craniofacial dysmorphisms such as a broad nasal bridge, short nose, micrognathia, low-set ears, and hypertelorism. Congenital heart defects, limb anomalies (particularly involving the hands and feet), and genitourinary malformations have also been reported. Some patients may present with thrombocytopenia or other hematologic abnormalities, particularly when the deletion involves the 11q23-qter region, which overlaps with Jacobsen syndrome (a well-characterized distal 11q deletion syndrome). There is no cure for this condition, and management is supportive and symptom-based. Treatment may include early intervention programs, speech and occupational therapy, surgical correction of congenital heart defects or other structural anomalies, and monitoring of hematologic parameters. A multidisciplinary team approach involving geneticists, cardiologists, neurologists, and developmental specialists is typically recommended to optimize outcomes.

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