sweating
631
,
632
|
Ichthyosis
|
Ichthyosis
|
633
|
KDM5C gene disease
|
Intellectual disability
|
634
|
Lissencephaly and agenesis of the corpus callosum
|
Epilepsy with subcortical band heterotopia
|
599
|
Lowe syndrome
|
Lenticular cataracts
|
635
|
MASA syndrome/SPG1
|
Mild intellectual disability, abducted thumbs
|
599
|
McLeod neuroacanthocytosis syndrome
|
Chorea, late‐onset cognitive decline
|
636
|
Menkes disease
|
Patchy kinky hair, hypopigmentation
|
637
,
638
|
Myopia
|
Mild myopia
|
639
|
Nance–Horan syndrome b
|
Posterior Y‐sutural cataracts and dental anomalies
|
640
|
Norrie disease
|
Retinal malformations
|
641
|
Ocular albinism type 1
|
Retinal/fundal pigmentary changes
|
642
|
Oculofaciodigital syndrome (OFD1) allelic with Simson–Galabia–Beheld syndrome 2 and Joubert syndrome
|
Facial dysmorphism, abnormal digits, and polycystic kidneys
|
599
|
Oligodontia
|
Hypodontia
|
643
|
Opitz G/BBB syndrome
|
Hypertelorism
|
644
|
Opitz–Kaveggia syndrome
|
Mild intellectual disability, hypertelorism
|
599
|
Ornithine transcarbamylase deficiency
|
Hyperammonemia, psychiatric/neurologic manifestations
|
645
,
646
|
Ovarian cancer
|
Ovarian cancer
|
647
|
Pelizaeus–Merzbacher
|
Possible mild spasticity
|
648
|
Retinoschisis
|
Peripheral retinal changes
|
649
|
Retinitis pigmentosa
|
Night blindness, concentric reduction of visual field, pigmentary fundal degeneration, extinction of electroretinogram, cone disruption, vision loss
|
650
,
651
|
MECP2‐duplication syndrome
|
Intellectual disability, neuropsychiatric features, endocrine abnormalities
|
652
|
Simpson–Golabi–Behmel syndrome
|
Extra lumbar/thoracic vertebrae, accessory nipples, facial dysmorphism
|
653
,
654
|
Spinal and bulbar muscular atrophy
|
Muscle weakness and cramps
|
655
|
Split‐hand/split‐foot anomaly
|
Mild split‐hand/split‐foot anomaly
|
656
|
Spondyloepiphyseal dysplasia, late onset
|
Arthritis
|
657
|
Ulnar hypoplasia with lobster‐claw deficiency of feet
|
Slight hypoplasia of ulnar side of hand and mild syndactyly of toes
|
658
|
Wiskott–Aldrich syndrome a
|
Abnormal platelets and lymphocytes
|
659
,
660
|
X‐linked intellectual disability
|
Mostly intellectual disability (many genes), occasional short stature, hypertension, psychiatric symptoms
|
661
–
663
|
X‐linked mental retardation
|
Short stature, hypertelorism
|
599
,
664
,
665
|
X‐linked mental retardation (OPHN1)
|
Cerebellar hypoplasia, distinctive facies
|
666
,
667
|
X‐linked myotubular myopathy
|
Weakness, respiratory problems
|
668
|
X‐linked protoporphyria
|
Life‐long photosensitivity; liver disease
|
669
|
X‐linked retinitis pigmentosa
|
Retinal changes
|
670
|
a Uncertain.
b May be same disorder.
History of a previous child with intellectual disability with a diagnosis deemed “idiopathic” or of unknown cause after chromosomal, fragile