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1.

9q22.3 microdeletion

9q22.3 microdeletion, which includes deletion of PTCH1, the gene that is mutated in Gorlin syndrome (nevoid basal cell carcinoma syndrome), is characterized by the clinical findings of this well-described disorder as well as developmental delay and/or intellectual disability, metopic craniosynostosis, obstructive hydrocephalus, pre- and postnatal macrosomia, and seizures. Affected individuals are also at increased risk for Wilms tumor. Common findings in Gorlin syndrome include: calcification of the falx cerebri prior to age 20 years; basal cell carcinomas (BCCs) of the skin; jaw keratocysts; palmar/plantar skin pits; and increased risk for childhood medulloblastomas as well as cardiac and ovarian fibromas. The clinical spectrum of the 9q22.3 microdeletion is variable and the clinical findings depend somewhat on the size of the microdeletion. [from GeneReviews]

MedGen UID:
468509
Concept ID:
CN119542
Disease or Syndrome
2.

Gorlin syndrome

Nevoid basal cell carcinoma syndrome (NBCCS) is characterized by the development of multiple jaw keratocysts, frequently beginning in the second decade of life, and/or basal cell carcinomas (BCCs) usually from the third decade onward. Approximately 60% of individuals have a recognizable appearance with macrocephaly, frontal bossing, coarse facial features, and facial milia. Most individuals have skeletal anomalies (e.g., bifid ribs, wedge-shaped vertebrae). Ectopic calcification, particularly in the falx, is present in more than 90% of affected individuals by age 20 years. Cardiac and ovarian fibromas occur in approximately 2% and 20% of individuals respectively. Approximately 5% of all children with NBCCS develop medulloblastoma (primitive neuroectodermal tumor [PNET]), generally the desmoplastic subtype. The risk of developing medulloblastoma is substantially higher in individuals with an SUFU pathogenic variant (33%) than in those with a PTCH1 pathogenic variant (<2%). Peak incidence is at age one to two years. Life expectancy in NBCCS is not significantly different from average. [from GeneReviews]

MedGen UID:
2554
Concept ID:
C0004779
Neoplastic Process

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