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A rare form of PCH with clinical manifestation neonatally of hypotonia and impaired swallowing and from infancy onward seizures, optic atrophy and short stature, but none of the clinical findings are specific for PCH3. To date, PCH3 is reported in only 3 families. In 2 families, an implication of locus 7q11-21 has been demonstrated. PCH3 is inherited in an autosomal recessive manner.
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