Partial deletion of the short arm of chromosome 11 syndrome

Partial deletion of the short arm of chromosome 11 syndrome (Orphanet code 261947) refers to a group of rare chromosomal disorders caused by the loss of genetic material from the short arm (p arm) of chromosome 11. The clinical presentation varies considerably depending on the size and precise location of the deleted segment. Deletions in this region can encompass several well-characterized syndromes, including WAGR syndrome (involving the 11p13 region) and Beckwith-Wiedemann-related imprinting disorders (11p15), but this Orphanet entry broadly covers partial 11p deletions that may not fit neatly into a single named condition. Affected individuals may present with a wide range of features including intellectual disability, developmental delay, growth abnormalities, craniofacial dysmorphism, and congenital anomalies affecting multiple organ systems such as the eyes, kidneys, and genitourinary tract. Depending on the genes involved in the deletion, patients may be at increased risk for certain tumors, including Wilms tumor (nephroblastoma) and aniridia when the PAX6 and WT1 genes at 11p13 are deleted. Cardiac defects, hearing impairment, and behavioral difficulties have also been reported in some cases. Treatment is symptomatic and supportive, tailored to the specific clinical features present in each individual. This may include surgical correction of congenital anomalies, tumor surveillance protocols (particularly for Wilms tumor), ophthalmologic management, early intervention programs for developmental delay, and special education services. Genetic counseling is recommended for affected families. No curative therapy currently exists, and long-term management requires a multidisciplinary approach involving pediatricians, geneticists, nephrologists, ophthalmologists, and other specialists as needed.

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