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Medulloblastoma information


Medulloblastoma
CT scan, showing a tumorous mass in the posterior fossa, giving rise to obstructive hydrocephalus, in a six-year-old girl
Pronunciation
  • /məˌdʌlblæˈstmə/
SpecialtyNeuro-oncology, neurosurgery
SymptomsHeadaches
Nausea
Vomiting
Tiredness
Clumsiness
Dizziness
Change in vision
Handwriting problems[1]
Usual onsetBetween 5 and 9 years old[1]
PrognosisFive-year survival rate: 72.1%[2]
FrequencyAbout 500 children diagnosed annually in the United States[1]

Medulloblastoma is a common type of primary brain cancer in children. It originates in the part of the brain that is towards the back and the bottom, on the floor of the skull, in the cerebellum, or posterior fossa.[3]

The brain is divided into two main parts, the larger cerebrum on top and the smaller cerebellum below towards the back. They are separated by a membrane called the tentorium. Tumors that originate in the cerebellum or the surrounding region below the tentorium are, therefore, called infratentorial.

Historically, medulloblastomas have been classified as a primitive neuroectodermal tumor (PNET), but it is now known that medulloblastoma is distinct from supratentorial PNETs and they are no longer considered similar entities.[4]

Medulloblastomas are invasive, rapidly growing tumors that, unlike most brain tumors, spread through the cerebrospinal fluid and frequently metastasize to different locations along the surface of the brain and spinal cord. Metastasis all the way down to the cauda equina at the base of the spinal cord is termed "drop metastasis".

The cumulative relative survival rate for all age groups and histology follow-up was 60%, 52%, and 47% at 5 years, 10 years, and 20 years, respectively, with children doing better than adults.[5]

  1. ^ a b c "Medulloblastoma". St. Jude Children's Research Hospital. Retrieved March 8, 2023.
  2. ^ "Medulloblastoma Diagnosis and Treatment". National Cancer Institute. 17 September 2018. Retrieved March 8, 2023.
  3. ^ Roussel MF, Hatten ME (2011). "Cerebellum". Cerebellum development and medulloblastoma. Current Topics in Developmental Biology. Vol. 94. pp. 235–82. doi:10.1016/B978-0-12-380916-2.00008-5. ISBN 9780123809162. PMC 3213765. PMID 21295689.
  4. ^ Hinz C, Hesser D (2006). Focusing On Brain Tumors: Medulloblastoma. American Brain Tumor Association. ISBN 0-944093-67-1. Archived from the original on 2008-09-08. Retrieved 2007-03-09.[page needed]
  5. ^ Cite error: The named reference Small was invoked but never defined (see the help page).

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