Introduction: Nongoitrous congenital hypothyroidism-6 (CHNG6) is a thyroid hormone resistance syndrome caused by a thyroid hormone receptor alpha (THRA) gene mutation, characterized by tissue-specific hypothyroidism and near-normal thyroid function tests. Snijders Blok-Campeau syndrome (SNIBCPS) is a rare autosomal dominant neurodevelopmental disorder caused by mutations in CHD3 genes, characterized by intellectual retardation, hypotonia, speech problems, and distinctive facial findings.