Rare Diseases

Hamartomatous Intestinal Polyposis Syndromes: A Comprehensive Medical Review Introduction Hamartomatous intestinal polyposis syndromes represent a rare group of autosomal dominant genetic disorders characterized by the development of benign hamartomatous polyps throughout the gastrointestinal tract, combined with distinctive extraintestinal manifestations and significantly increased cancer risks. According to the National Organization for Rare Disorders (NORD) and major …

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Hamano Tsukamoto Syndrome (Spinal Atrophy-Ophthalmoplegia-Pyramidal Syndrome): A Comprehensive Medical Review Introduction Hamano-Tsukamoto syndrome, also known as spinal atrophy-ophthalmoplegia-pyramidal syndrome, is an extremely rare genetic disorder first described by Hamano and colleagues in 1994 in two affected siblings. This condition is catalogued by Orphanet, the European reference portal for rare diseases, under ORPHA number 1217 as …

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Hamamy Syndrome: A Comprehensive Medical Review Introduction Hamamy syndrome (HMMS), also known as craniofacial dysplasia-osteopenia syndrome, is an extremely rare autosomal recessive genetic disorder first described by Hanan Hamamy and colleagues in 2007 in two Jordanian brothers born to consanguineous parents. This syndrome is caused by homozygous mutations in the IRX5 gene located on chromosome …

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Hallux Varus Preaxial Polysyndactyly Syndrome: A Comprehensive Medical Review Introduction Hallux varus-preaxial polysyndactyly syndrome is an extremely rare genetic disorder of congenital limb malformation first described in the medical literature in 1980, characterized by bilateral medial displacement of the hallux (great toe) combined with preaxial polysyndactyly of the first toes. According to Orphanet, the European …

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Hallervorden Spatz Syndrome (Pantothenate Kinase-Associated Neurodegeneration): A Comprehensive Medical Review Introduction Hallervorden-Spatz syndrome, now more appropriately termed Pantothenate Kinase-Associated Neurodegeneration (PKAN), is a rare autosomal recessive neurodegenerative disorder first described by Julius Hallervorden and Hugo Spatz in 1922. The condition was renamed to PKAN following the identification of mutations in the PANK2 gene in 2001 …

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Hallermann Streiff Syndrome: A Comprehensive Medical Review Introduction Hallermann-Streiff syndrome (HSS), also known as oculomandibulodyscephaly with hypotrichosis, is an extremely rare genetic disorder first described by François Aubry in the late 1800s and later characterized as a distinct clinical entity by Wilhelm Hallermann in 1948 and Enrico Streiff in 1950. According to the National Organization …

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Hall Riggs Syndrome: A Comprehensive Medical Review Introduction Hall-Riggs syndrome is an extremely rare autosomal recessive genetic disorder first described by Hall and Riggs in 1975, characterized by a distinctive constellation of features including severe intellectual disability, microcephaly, distinctive facial dysmorphisms, and progressive spondylometaphyseal dysplasia. According to Orphanet, the European reference portal for rare diseases, …

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