posterior fossa

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posterior fossa

a depression on the posterior surface of the humerus, above the trochlea, that lodges the olecranon of the ulna when the elbow is extended.

Patient discussion about posterior fossa

Q. info on arachnoid cyst in the right posterior fossa

A. Basically it's like a small sac filled with fluid. The problem is that the skull is a rigid closed space, which means that if there's something other than the brain, it'll occupy space, usually on expense of the brains' space. These kinds of problems are often referred to as "space occupying lesion".

It's usually congenital (i.e. develops during pregnancy), and even when it cause symptoms they develop slowly.

YOu can read more here (

More discussions about posterior fossa
References in periodicals archive ?
Sub-occipital or posterior fossa craniotomy: Bone is removed from the back of the base of the skull in order to relieve pressure and to create more room for the cerebellum and brain stem.
My youngest son, Hudson, was diagnosed with a fast-growing, posterior fossa, atypical teratoid rhabdoid tumor (ATRT) of the brain.
A posterior fossa haematoma and further neurological deterioration complicated external ventricular drainage presumably due to sudden intracranial hypotension.
Considering the fact, that the upper anterior third of the posterior fossa is surgically hidden, the narrow passage between the petroclival surface anteriorly and the surface of the brainstem posteriorly may be essential for any surgical approach to the basilar region (2).
Emergency posterior fossa craniectomy and foramen magnum decompression were performed.
He and his colleagues reviewed the records of 46 patients aged 17 years and older who underwent posterior fossa MRA between 2000 and 2003.
There may also be descent of the cerebellar tonsils, obliteration of prepontine, perichiasmatic cisterns, flattening of the optic chiasm, crowding of the posterior fossa, as well as decreased ventricular size, according to Dr.
A posterior fossa craniotomy revealed a solid, reddish fleshy lesion in the cerebellar vermis that blended in with the surrounding cerebellum.
In 1987, a 57-year-old woman was hospitalized for gait ataxia, dysarthria, dizziness, and bilateral hypertonus 43 months following a posterior fossa decompression and cervical vertebrae level 1 laminectomy, which included placement of a LYODURA[R] graft to correct an Arnold-Chiari malformation and syringomyelia.
In June 1985, BC/BS updated its assessment and recommended that MRI be considered" generally accepted medical practice for diagnostic conditions of the posterior fossa (cerebellum and brainstem) and high (C1 through C4) cervical cord and demyelinating diseases of the white matter of the brain.
This comprehensive reference text on cerebellar disorders in children includes chapters on cerebellar development, prenatal cerebellar imaging, imaging of the posterior fossa, with coverage of a broad range of malformations, genetic and metabolic disorders involving the cerebellum, prenatal cerebellar disruptions (as related to prematurity), vascular disorders, tumors and paraneoplastic syndromes, as well as acute ataxia and trauma to the posterior fossa.

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