Skip navigation | ||
|
||
Medical Encyclopedia |
|
Other encyclopedia topics: | A-Ag Ah-Ap Aq-Az B-Bk Bl-Bz C-Cg Ch-Co Cp-Cz D-Di Dj-Dz E-Ep Eq-Ez F G H-Hf Hg-Hz I-In Io-Iz J K L-Ln Lo-Lz M-Mf Mg-Mz N O P-Pl Pm-Pz Q R S-Sh Si-Sp Sq-Sz T-Tn To-Tz U V W X Y Z 0-9 |
Contents of this page: | |
Alternative names
Infratentorial brain tumors; Brainstem gliomaDefinition Return to top
Posterior fossa tumor is an abnormal growth located in or near the posterior fossa (a depression on the interior, back portion of the base of the skull, near the cerebellum part of the brain).Causes, incidence, and risk factors Return to top
Most tumors of the posterior fossa are primary brain cancers, which originate in the brain, rather than spreading from elsewhere in the body.
They have no known cause or risk factors associated with them.
Symptoms Return to top
Symptoms occur very early with posterior fossa tumors. The posterior fossa itself is a small, confined space, and any growth there can block the flow of spinal fluid and cause increased pressure on the brain and spinal cord. The symptoms of increased intracranial pressure include:
Symptoms from posterior fossa tumors also occur when the tumor damages local structures, such as cranial nerves. Symptoms of cranial nerve damage include:
Signs and tests Return to top
Diagnosis is based on thorough history and physical examination, followed by imaging tests. The best way to look at the posterior fossa is with an MRI.
Posterior craniotomy (open brain surgery) or stereotactic biopsy (using special instruments to get a small piece of the tumor) can be used to obtain tissue for diagnosis.
Tumors of the posterior fossa usually require surgical removal, even if they are benign (noncancerous). This is because of the delicate structures in the area which can be compressed by any abnormal growth and the frequency of symptoms associated with the tumors.
Treatment Return to top
Most tumors of the posterior fossa are surgically removed. Occasionally, depending on the type of tumor and the size of it, post-operative radiation treatment is also used.Support Groups Return to top
The stress of illness may be eased by joining a support group whose members share common experiences and problems.Expectations (prognosis) Return to top
Prognosis depends on early detection. Complete obstruction to the flow of spinal fluid causes herniation and death. If tumors are recognized before this point, surgery is associated with good, long-term survival.Complications Return to top
Calling your health care provider Return to top
Call your health care provider if you notice consistent headaches that are accompanied by nausea, vomiting, or visual changes. Update Date: 8/3/2004 Updated by: Marcia S. Brose, M.D., Ph.D., Assistant Professor, Hematology/Oncology, The University of Pennsylvania Cancer Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.
Home | Health Topics | Drug Information | Encyclopedia | Dictionary | News | Directories | Other Resources | |
Copyright | Privacy | Accessibility | Selection Guidelines U.S. National Library of Medicine, 8600 Rockville Pike, Bethesda, MD 20894 National Institutes of Health | Department of Health & Human Services |
Page last updated: 28 October 2004 |