An Atypical Presentation of Dyskeratosis Congenita in a Child With a Familial RTEL1 Mutation.

Dyskeratosis congenita (DC) is a rare inherited bone marrow disease that classically presents with the triad of oral leukoplakia, nail dystrophy, and reticular hyperpigmentation. It is most commonly caused by a defect in the DKC1 gene involved in telomere stability. Malignant progression of oral leukoplakia to squamous cell carcinoma (SCC) is rare in DC, especially in younger patients, and cutaneous SCC is only reported in 1.5% of cases of DC. Here we report a case of a 12-year-old female with a familial heterozygous RTEL1 (regulator of telomere elongation helicase 1) gene mutation associated with a severe phenotype of DC characterized by multiple cutaneous SCCs.