Partial deletion of chromosome 11 syndrome

Partial deletion of chromosome 11 syndrome (Orphanet code 261816) refers to a group of rare chromosomal disorders caused by the loss (deletion) of a segment of chromosome 11. Because chromosome 11 contains numerous genes essential for normal development, the clinical presentation varies widely depending on the size and precise location of the deleted segment (short arm 11p or long arm 11q). Deletions involving the short arm (11p) may overlap with well-characterized conditions such as WAGR syndrome (11p13 deletion, involving Wilms tumor, aniridia, genitourinary anomalies, and intellectual disability) or Beckwith-Wiedemann-related imprinting disorders, while deletions of the long arm (11q) can overlap with Jacobsen syndrome (11q23 deletion). Common features across many partial chromosome 11 deletions include developmental delay, intellectual disability, growth abnormalities, craniofacial dysmorphism, and variable congenital malformations affecting the heart, kidneys, eyes, and skeletal system. The severity of the condition depends on which genes are lost in the deleted region. Affected individuals may present at birth with low birth weight, feeding difficulties, hypotonia, and distinctive facial features such as a broad nasal bridge, widely spaced eyes, low-set ears, or micrognathia. Cardiac defects, including septal defects and other structural heart anomalies, are reported in some cases. Genitourinary malformations, limb anomalies, and hearing loss may also occur. Behavioral difficulties and speech delays are frequently observed during childhood. There is no cure for partial deletion of chromosome 11 syndrome. Management is supportive and multidisciplinary, tailored to the individual's specific clinical features. This may include early intervention programs, speech and occupational therapy, surgical correction of congenital heart or other structural defects, ophthalmologic monitoring, and regular developmental assessments. Genetic counseling is recommended for affected families to discuss recurrence risk and to characterize the deletion through chromosomal microarray or karyotype analysis.

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