NeurometPlus

Incidence

Rare occurence. Chromosome 13, Partial Monosomy 13q appears to occur randomly, for no apparent reason (sporadic).

Clinical Characteristics

Chromosome 13, Partial Monosomy 13q is a rare chromosomal disorder in which a portion of the long arm (q) of chromosome 13 is missing (deleted or monosomic). The range and severity of symptoms may vary greatly, depending upon the exact size and location of the deletion on 13q. Chromosome 13, Partial Monosomy 13q is usually apparent at birth and may be characterized by low birth weight, malformations of the head and facial (craniofacial) area, abnormalities of the eyes, defects of the hands and/or feet, genital malformations in affected males, and/or additional physical abnormalities. Affected infants and children may also exhibit delays in the acquisition of skills requiring the coordination of mental and muscular activity (psychomotor retardation) as well as varying degrees of mental retardation. In the majority of cases, Chromosome 13, Partial Monosomy 13q appears to occur randomly, for no apparent reason (sporadic). Deletion of the long arm of chromosome 13 with a wide spectrum of abnormalities, including retinoblastoma, mental and growth retardation, brain malformations, heart defects, distal limb deformities, and digestive, urogenital, and other abnormalities. Deletions limited to proximal bands (q13-q31) are marked mainly by growth retardation but no major deformities, those involving band 32q are usually associated with numerous major malformations, and distal deletions are usually complicated by severe mental retardation with comparatively minor abnormalities. Garcia-Lurie syndrome and this disorder share many common clinical features.

Precipitants

None

Provocation Tests

None

Diagnostic Procedures

Karyotype. Chromosome 13q deletion.