Tuberous sclerosis

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Micrograph showing a renal angiomyolipoma, as may be seen in tuberous sclerosis. H&E stain. (WC/KGH)

Tuberous sclerosis, also tuberous sclerosis complex (abbreviated TSC), is an autosomal dominant syndrome associated with an increased risk of hamartomas and some risk increase for malignant tumours.

Historically described as:[1]

  1. Epilepsy.
  2. Mental retardation.
  3. Adenoma sebaceum (angiofibromas).

Diagnostic consensus criteria published (2012, OpenAcess).

Also called Bourneville-Pringle disease.

General

  • Autosomal dominant with variable penetrance.[2]
  • Majority (60-70%) are de novo mutations.[2]
  • May be treated with a mTOR inhibitor, e.g. everolimus.[3]

Associations

Pathologic:

Note:

  • The same genes (TSC1, TSC2) are implicated in PEComas.
  • Renal lesions are seen in ~60% of patients.[4]

Mnemonic SALSA HEART:[8]

Genes

  • TSC1.[11]
  • TSC2.[12]
    • Some evidence to suggest it is more often implicated in malignant tumours (than TSC1).[13]
    • TSC2 mutations have a higher prevalence (than TSC1 mutations) and are considered more aggressive.[4]

Notes:

  • The proteins (hamartin and tuberin) are expressed in a wide variety of tissues.[14]

Incidence

~1 in 10,000 population.[1][13]

See also

References

  1. 1.0 1.1 URL: http://emedicine.medscape.com/article/1177711-overview. Accessed on: 13 February 2011.
  2. 2.0 2.1 2.2 2.3 2.4 Guo, J.; Tretiakova, MS.; Troxell, ML.; Osunkoya, AO.; Fadare, O.; Sangoi, AR.; Shen, SS.; Lopez-Beltran, A. et al. (Nov 2014). "Tuberous Sclerosis-associated Renal Cell Carcinoma: A Clinicopathologic Study of 57 Separate Carcinomas in 18 Patients.". Am J Surg Pathol 38 (11): 1457-67. doi:10.1097/PAS.0000000000000248. PMID 25093518.
  3. Pirson, Y. (Jul 2013). "Tuberous sclerosis complex-associated kidney angiomyolipoma: from contemplation to action.". Nephrol Dial Transplant 28 (7): 1680-5. doi:10.1093/ndt/gft009. PMID 23413089.
  4. 4.0 4.1 4.2 4.3 4.4 Rakowski SK, Winterkorn EB, Paul E, Steele DJ, Halpern EF, Thiele EA (November 2006). "Renal manifestations of tuberous sclerosis complex: Incidence, prognosis, and predictive factors". Kidney Int. 70 (10): 1777–82. doi:10.1038/sj.ki.5001853. PMID 17003820.
  5. Grajkowska, W.; Kotulska, K.; Jurkiewicz, E.; Roszkowski, M.; Daszkiewicz, P.; Jóźwiak, S.; Matyja, E. (2011). "Subependymal giant cell astrocytomas with atypical histological features mimicking malignant gliomas.". Folia Neuropathol 49 (1): 39-46. PMID 21455842.
  6. Kobayashi, T.; Satoh, K.; Ohkawa, M. (Feb 2005). "Multifocal micronodular pneumocyte hyperplasia associated with tuberous sclerosis.". Acta Radiol 46 (1): 37-40. PMID 15841738.
  7. Kobashi, Y.; Sugiu, T.; Mouri, K.; Irei, T.; Nakata, M.; Oka, M. (Jun 2008). "Multifocal micronodular pneumocyte hyperplasia associated with tuberous sclerosis: differentiation from multiple atypical adenomatous hyperplasia.". Jpn J Clin Oncol 38 (6): 451-4. doi:10.1093/jjco/hyn042. PMID 18535095.
  8. URL: http://www.usmle-forums.com/usmle-step-1-mnemonics/303-tuberous-sclerosis.html. Accessed on: 20 October 2011.
  9. URL: http://dermatology-s10.cdlib.org/1611/articles/3_2009-11-17/batra.html. Accessed on: 18 February 2012.
  10. Jindal, R.; Jain, A.; Gupta, A.; Shirazi, N. (Jun 2013). "Ash-leaf spots or naevus depigmentosus: a diagnostic challenge.". BMJ Case Rep 2013. doi:10.1136/bcr-2012-007008. PMID 23761491.
  11. Online 'Mendelian Inheritance in Man' (OMIM) 605284
  12. Online 'Mendelian Inheritance in Man' (OMIM) 191092
  13. 13.0 13.1 Al-Saleem T, Wessner LL, Scheithauer BW, et al. (November 1998). "Malignant tumors of the kidney, brain, and soft tissues in children and young adults with the tuberous sclerosis complex". Cancer 83 (10): 2208–16. PMID 9827727.
  14. Johnson, MW.; Kerfoot, C.; Bushnell, T.; Li, M.; Vinters, HV. (Mar 2001). "Hamartin and tuberin expression in human tissues.". Mod Pathol 14 (3): 202-10. doi:10.1038/modpathol.3880286. PMID 11266527.