Bannayan-Riley-Ruvalcaba syndrome
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Bannayan-Riley-Ruvalcaba syndrome is a genetic condition characterised by a large head size (macrocephaly), multiple noncancerous tumours and tumour-like growths called hamartomas, and dark freckles on the penis in males. The signs and symptoms of Bannayan-Riley-Ruvalcaba syndrome are present from birth or become apparent in early childhood.
Descrição
Bannayan-Riley-Ruvalcaba syndrome is a genetic condition characterised by a large head size (macrocephaly), multiple noncancerous tumours and tumour-like growths called hamartomas, and dark freckles on the penis in males. The signs and symptoms of Bannayan-Riley-Ruvalcaba syndrome are present from birth or become apparent in early childhood.
At least half of affected infants have macrocephaly, and many also have a high birth weight and a large body size (macrosomia). Growth usually slows during childhood, so affected adults are of normal height and body size. About half of all children with Bannayan-Riley-Ruvalcaba syndrome have intellectual disability or delayed development, particularly the development of speech and of motor skills such as sitting, crawling, and walking. These delays may improve with age.
About half of all people with Bannayan-Riley-Ruvalcaba syndrome develop hamartomas in their intestines, known as hamartomatous polyps. Other noncancerous growths often associated with Bannayan-Riley-Ruvalcaba syndrome include fatty tumours called lipomas and angiolipomas that develop under the skin. Some affected individuals also develop hemangiomas, which are red or purplish growths that consist of tangles of abnormal blood vessels. People with Bannayan-Riley-Ruvalcaba syndrome may also have an increased risk of developing certain cancers, although researchers are still working to determine the cancer risks associated with this condition.
Other signs and symptoms that have been reported in people with Bannayan-Riley-Ruvalcaba syndrome include weak muscle tone (hypotonia) and other muscle abnormalities, and seizures. Some affected individuals have thyroid problems, such as an enlargement of the thyroid gland, known as multinodular goiter, or a condition called Hashimoto thyroiditis. Skeletal abnormalities have also been described with this condition, including an unusually large range of joint movement (hyperextensibility), abnormal side-to-side curvature of the spine (scoliosis), and a sunken chest (pectus excavatum).
The features of Bannayan-Riley-Ruvalcaba syndrome overlap with those of another disorder called Cowden syndrome. People with Cowden syndrome develop hamartomas and other noncancerous growths; they also have an increased risk of developing certain types of cancer. Both conditions can be caused by mutations in the PTEN gene. Some people with Bannayan-Riley-Ruvalcaba syndrome have had relatives diagnosed with Cowden syndrome, and other individuals have had the characteristic features of both conditions. Based on these similarities, researchers have proposed that Bannayan-Riley-Ruvalcaba syndrome and Cowden syndrome represent a spectrum of overlapping features known as PTEN hamartoma tumour syndrome instead of two distinct conditions.
Padrões de herança
The source lists the following possible inheritance patterns: Autosomal dominant. More than one pattern can apply in different cases.
Related genes
Other names
Bannayan-Ruvalcaba-Riley syndrome
Bannayan-Zonana syndrome
BRRS
BZS
Myhre-Riley-Smith syndrome
Riley-Smith syndrome
Ruvalcaba-Myhre syndrome
Ruvalcaba-Myhre-Smith syndrome
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Leitura adicional e referências
- Bannayan-Riley-Ruvalcaba syndrome; MedlinePlus, National Library of Medicine.
- Blumenthal GM, Dennis PA. PTEN hamartoma tumor syndromes. Eur J Hum Genet. 2008 Nov;16(11):1289-300. doi: 10.1038/ejhg.2008.162. Epub 2008 Sep 10.
- Eng C. PTEN: one gene, many syndromes. Hum Mutat. 2003 Sep;22(3):183-98. doi: 10.1002/humu.10257.
- Hobert JA, Eng C. PTEN hamartoma tumor syndrome: an overview. Genet Med. 2009 Oct;11(10):687-94. doi: 10.1097/GIM.0b013e3181ac9aea.
- Lynch NE, Lynch SA, McMenamin J, Webb D. Bannayan-Riley-Ruvalcaba syndrome: a cause of extreme macrocephaly and neurodevelopmental delay. Arch Dis Child. 2009 Jul;94(7):553-4. doi: 10.1136/adc.2008.155663. Epub 2009 Mar 25.
- Marsh DJ, Coulon V, Lunetta KL, Rocca-Serra P, Dahia PL, Zheng Z, Liaw D, Caron S, Duboue B, Lin AY, Richardson AL, Bonnetblanc JM, Bressieux JM, Cabarrot-Moreau A, Chompret A, Demange L, Eeles RA, Yahanda AM, Fearon ER, Fricker JP, Gorlin RJ, Hodgson SV, Huson S, Lacombe D, Eng C, et al. Mutation spectrum and genotype-phenotype analyses in Cowden disease and Bannayan-Zonana syndrome, two hamartoma syndromes with germline PTEN mutation. Hum Mol Genet. 1998 Mar;7(3):507-15. doi: 10.1093/hmg/7.3.507.
- Marsh DJ, Kum JB, Lunetta KL, Bennett MJ, Gorlin RJ, Ahmed SF, Bodurtha J, Crowe C, Curtis MA, Dasouki M, Dunn T, Feit H, Geraghty MT, Graham JM Jr, Hodgson SV, Hunter A, Korf BR, Manchester D, Miesfeldt S, Murday VA, Nathanson KL, Parisi M, Pober B, Romano C, Eng C, et al. PTEN mutation spectrum and genotype-phenotype correlations in Bannayan-Riley-Ruvalcaba syndrome suggest a single entity with Cowden syndrome. Hum Mol Genet. 1999 Aug;8(8):1461-72. doi: 10.1093/hmg/8.8.1461.
- Parisi MA, Dinulos MB, Leppig KA, Sybert VP, Eng C, Hudgins L. The spectrum and evolution of phenotypic findings in PTEN mutation positive cases of Bannayan-Riley-Ruvalcaba syndrome. J Med Genet. 2001 Jan;38(1):52-8. doi: 10.1136/jmg.38.1.52. No abstract available.
- Tramontana T, Yehia L. PTEN Hamartoma Tumor Syndrome. 2001 Nov 29 [updated 2026 Jul 28]. In: Adam MP, Bick S, Mirzaa GM, Wallace SE, Amemiya A, editors. GeneReviews(R) [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2026. Available from http://www.ncbi.nlm.nih.gov/books/NBK1488/
- Zbuk KM, Eng C. Cancer phenomics: RET and PTEN as illustrative models. Nat Rev Cancer. 2007 Jan;7(1):35-45. doi: 10.1038/nrc2037. Epub 2006 Dec 14.
- Zhou XP, Waite KA, Pilarski R, Hampel H, Fernandez MJ, Bos C, Dasouki M, Feldman GL, Greenberg LA, Ivanovich J, Matloff E, Patterson A, Pierpont ME, Russo D, Nassif NT, Eng C. Germline PTEN promoter mutations and deletions in Cowden/Bannayan-Riley-Ruvalcaba syndrome result in aberrant PTEN protein and dysregulation of the phosphoinositol-3-kinase/Akt pathway. Am J Hum Genet. 2003 Aug;73(2):404-11. doi: 10.1086/377109. Epub 2003 Jul 3.
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