10q26 deletion is an extremely rare genetic syndrome caused by terminal deletion of the long arm of chromosome 10 at 10q26.^[1] It is usually a de novo mutation. Symptoms can include "growth and mental retardation, microcephaly, triangular face, strabismus, hypertelorism, prominent nasal bridge, beaked or prominent nose, low-set dysplastic ears, various congenital heart defects, cryptorchidism, other anogenital anomalies, defect of hands/feet, limb contractures, abnormal behavior with hyperactivity, attention deficit, destructive tendency".^[2] People with the syndrome are less likely to have hearing deficits compared to those where the missing genetic material includes 10q25.^[3] The syndrome was first reported in 1979.^[4] Interstitial deletions including parts of 10q26 also have been reported, but they are more rare.^[1]

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