questions 3

Tuberous Sclerosis

Topic updated on 06/30/17 2:15pm

  • A 6-month-old infant is brought to the emash leafergency department after the parent noticed symmetric and synchronous spasmodic movement of the neck, trunk, and extremities. Hypopigmented area of the skin is notable on physical examination, which can be better visualized on Wood’s lamp. Hypsarrhythmia is seen on EEG.
  • Tuberous sclerosis
    • neurocutaneous autosomal dominant disease
      • mutation in either TSC1 (encodes hamartin on chromosome 9) and TSC2 (encodes tuberin on chromosome 16) is associated with tuberous sclerosis
        • normally, hamartin and tuberin form a complex that down regulates mTOR signaling
    • characterized by hamartoma and benign neoplasm development in the brain and various tissues
      • cerebral cortex
        • cortical hamartomas (“tubers”)
          • associated with seizures, which are difficult to control with seizure treatment
          • subependymal astrocytic proliferation
      • retina
        • retinal glial hamartomas
      • heart
        • cardiac rhabdomyomas
      • renal
        • renal angiomyolipomas
    • cutaneous manifestations
      • adenoma sebaceum (angiofibromas)
      • hypopigmented macule (ash leaf spot)
      • shagreen patches
        • patches of localized leathery thickenings
      • periungual fibromas
Presentation and Evaluation
  • Depending on where benign tumors develop (i.e., brain, heart, skin, etc.), as mentioned above
    • seizure 
      • a frequent and significant cause of morbidity
      • infantile spasm
        • most common type of seizure at initial diagnosis
        • hypsarrythmia can be seen on EEG
  • Infantile spasms 
    • adrenocorticotropic hormone (ACTH)
      • beneficial in the treatment of infantile spasms in patients with or without tuberous sclerosis
      • how it treats infantile spasm in not fully understood
    • vigabatrin
      • may be effective in the treatment of infantile spasms in patients with tuberous sclerosis
      • believed to irreversibly inhibit GABA transaminase, to increase GABA concentration in the brain
    • ketogenic diet or vagus nerve stimulator
      • can be considered in medically intractable seizures


Qbank (1 Questions)

(M1.NE.72) A one-year-old boy presents to your office accompanied by his father. On examination of the boy, you observe the findings shown in Figure A. The appearance of his father's face is depicted in Figure B.

What is the most likely diagnosis for the boy? Topic Review Topic
FIGURES: A   B        

1. Neurofibromatosis
2. Von Hippel-Lindau disease
3. Familial adenomatous polyposis
4. Tuberous sclerosis
5. Osler-Weber-Rendu disease

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