medical notes

Apr 17th, 2015
Studypool Tutor
Price: $5 USD

Tutor description

Word Count: 1534
Showing Page: 1/5
Posterior Fossa TumorsTumors in the posterior fossa are considered some of the most critical brain lesions. This is due primarily to the limited space within the posterior fossa, as well as the potential involvement of the vital brain stem nuclei. Some patients should undergo operation on an emergency basis, especially if they present with acute symptoms of brain stem involvement or herniation. Occurrence Posterior fossa tumors are more common in children than the adult populations. Between 54% and 70% of all childhood brain tumors originate in the posterior fossa. About 15-20% of brain tumors in adults occur in the posterior fossa. Certain types of posterior fossa tumors, such as medulloblastoma, pineoblastoma, ependymomas, primitive neuroectodermal tumors (PNETs), and astrocytomas of the cerebellum and brain stem, occur more frequently in children. Etiology: No specific causes for posterior fossa tumors exist. However, genetic factors, such as dysfunction of some tumor suppressor genes (p53 gene) and activation of some oncogenes, may play a role in their developmentPathophysiology: Common types of posterior fossa tumors include the following: Cerebellar astrocytoma Cystic cerebellar astrocytoma comprises about 33% of all posterior fossa tumors in children. It represents 25% of all pediatric tumors. Average age of presentation is 9 years. Typically, cerebellar astrocytoma presents as a laterally located cyst with a well-defined solid component. It may be sol

Review from student

Studypool Student
" Outstanding Job!!!! "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1827 tutors are online

Other Documents

04/17/2015
04/17/2015
04/17/2015
04/17/2015
04/17/2015
04/17/2015
04/17/2015
04/17/2015

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors