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Articles » Magnetic Resonance Imaging » MRI, Syndromes
2005-10-24-11 MRI, tuberous sclerosis © Werner www.thefetus.net/

Tuberous sclerosis

Heron Werner, MD*,Pedro Daltro,MD*,  Dorothy Bulas, MD #

* Heron Werner, MD
Clínica de Diagnóstico por Imagem (CDPI) & Instituto Fernandes Figueira (IFF) – FIOCRUZ
Rio de Janeiro – Brazil

# Dorothy I. Bulas M.D.
Professor of Radiology and Pediatrics
Children"s National Medical Center
George Washington University Medical Center
111 Michigan Ave, NW,   Washington D.C. 20010

Tuberous sclerosis consists in the development of hamartomatous lesions in several tissues, especially brain, skin, heart and kidneys. It presents an autosomal dominant inheritance, although most cases represents new mutations in non-affected families.

Fetal cardiac tumors (rhabdomyomas) constitute the main abnormality visualized by prenatal ultrasound. Such tumors are echogenic masses in the heart. They are localized in the ventricle walls, protruding into the cardiac cavity. Around 50 percent of fetuses with rhabdomyomas have tuberous sclerosis. The prognosis of cardiac rhabdomyomas is good, mostly with postnatal involution. However, the diagnosis of intrauterine tuberous sclerosis, which is only possible by MRI complementation, changes the fetal prognosis completely. This is due to the increasing frequency of mental retardation and convulsions (80 percent) (Mirlesse, 1992).

Werner et al. (1994) analyzed two cases of fetuses with cardiac rhabdomyoma that were diagnosed by a routine ultrasound examination in the third trimester of gestation. Both fetuses were later examined by MRI, which pinpointed cortical and subependymal hamartomas in the walls of the lateral ventricles of the brain, a suggestion of tuberous sclerosis.


 

 Table 1: Main aspects of Tuberous Sclerosis

Classic triad (< 50% of cases):

  • facial lesions,
  • convulsions and
  • mental retardation

 Central Nervous System

  • cortical hamartomas
  • lesion of white substance*
  • subependymal hamartomas (95%)
  • typical localization: alongside lateral ventricles walls                                     

 Astrocytoma of subependymal giant cells*

  • localization: foramen of Monro
  • obstructive hydrocephaly

 Kidney:

  • cysts
  • angiolipoma

 Cardiovascular:

  • rhabdomyoma
  • aneurysm, stenosis and vascular ectopic

 Liver:

  • leiomyoma
  • adenoma

• There are no reports on intrauterine visualization

 

 

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