Karsch-Neugebauer syndrome(KNS)

MedGen UID:: 401072
•Concept ID:: C1866740
•: Disease or Syndrome

Synonyms:	Split hand nystagmus syndrome; Split hand split foot nystagmus; SPLIT-HAND WITH CONGENITAL NYSTAGMUS, FUNDAL CHANGES, AND CATARACTS
SNOMED CT:	Karsch Neugebauer syndrome (722032005)
Modes of inheritance:	Autosomal dominant inheritance MedGen UID: 141047 •Concept ID: C0443147 • Intellectual Product Source: Orphanet A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in heterozygotes. In the context of medical genetics, an autosomal dominant disorder is caused when a single copy of the mutant allele is present. Males and females are affected equally, and can both transmit the disorder with a risk of 50% for each child of inheriting the mutant allele. Autosomal dominant inheritance (Orphanet)

Monarch Initiative:	MONDO:0008466
OMIM®:	183800
Orphanet:	ORPHA2329

Definition

A rare syndrome with characteristics of split-hand and split-foot deformity and ocular abnormalities mainly a congenital nystagmus. Ten cases from four families have been reported in the literature. In some cases the hands are monodactylous. The affected patients have normal mental development. The condition seems to be autosomal dominant with a relatively high proportion of gonadal mosaicism. [from SNOMEDCT_US]

Clinical features

From HPO

Split foot

MedGen UID:: 140919
•Concept ID:: C0432028
•: Congenital Abnormality

A condition in which middle parts of the foot (toes and metatarsals) are missing giving a cleft appearance. The severity is very variable ranging from slightly hypoplastic 3rd toe over absent 2nd or 3rd toes as far as oligo- or monodactyl feet.

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Split hand

MedGen UID:: 397570
•Concept ID:: C2699510
•: Congenital Abnormality

A condition in which middle parts of the hand (fingers and metacarpals) are missing giving a cleft appearance. The severity is very variable ranging from slightly hypoplastic middle fingers over absent middel fingers as far as oligo- or monodactyl hands.

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Hand monodactyly

MedGen UID:: 870952
•Concept ID:: C4025415
•: Congenital Abnormality

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Nystagmus

MedGen UID:: 45166
•Concept ID:: C0028738
•: Disease or Syndrome

Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms.

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Retinopathy

MedGen UID:: 11209
•Concept ID:: C0035309
•: Disease or Syndrome

Any noninflammatory disease of the retina. This nonspecific term is retained here because of its wide use in the literature, but if possible new annotations should indicate the precise type of retinal abnormality.

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Strabismus

MedGen UID:: 21337
•Concept ID:: C0038379
•: Disease or Syndrome

A misalignment of the eyes so that the visual axes deviate from bifoveal fixation. The classification of strabismus may be based on a number of features including the relative position of the eyes, whether the deviation is latent or manifest, intermittent or constant, concomitant or otherwise and according to the age of onset and the relevance of any associated refractive error.

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Cataract