Posterior fossa decompression


The indications for PFD vary depending on the underlying pathology. Some of the main indications include:

1. Chiari Malformation Type I Symptomatic Chiari I malformation with evidence of brainstem compression or syringomyelia. Progressive neurological deficits such as dysphagia, ataxia, or myelopathy. Severe headache, typically occipital, worsened by Valsalva maneuvers (e.g., coughing, sneezing). Syringomyelia or hydromyelia with progressive symptoms. 2. Chiari Malformation Type II (Arnold-Chiari) Often associated with myelomeningocele and hydrocephalus. Indications for decompression include symptomatic brainstem dysfunction, worsening scoliosis, or syringomyelia. 3. Posterior Fossa Tumors Symptomatic posterior fossa tumors causing obstructive hydrocephalus, brainstem compression, or cerebellar dysfunction. Common tumors include medulloblastoma, ependymoma, pilocytic astrocytoma, hemangioblastoma, and metastatic lesions. 4. Hydrocephalus with Fourth Ventricular Outlet Obstruction When hydrocephalus is caused by compression or obstruction at the level of the foramen of Magendie or Luschka (e.g., Dandy-Walker malformation). As an alternative or adjunct to ventriculoperitoneal (VP) shunting. 5. Cerebellar Stroke or Hemorrhage Life-threatening cerebellar infarcts or hemorrhages leading to brainstem compression, hydrocephalus, or herniation. Indicated in patients with deteriorating neurological status or radiological signs of impending herniation. 6. Basilar Invagination When associated with brainstem compression and significant neurological deficits. Often requires additional stabilization with occipitocervical fusion. 7. Syringomyelia and Syringobulbia Syringomyelia secondary to Chiari malformation, with progressive symptoms unresponsive to conservative management. Syringobulbia with brainstem dysfunction. 8. Dandy-Walker Malformation Indicated in cases where there is progressive hydrocephalus or brainstem compression. PFD may be performed alongside shunting procedures. 9. Skull Base Compression Syndromes Conditions such as platybasia, clival abnormalities, or craniovertebral junction anomalies causing posterior fossa crowding and compression. The decision to perform PFD depends on the severity of symptoms, radiological findings (MRI/CT), and response to conservative management. It is crucial to weigh the benefits of decompression against potential complications such as CSF leaks, pseudomeningocele, and cerebellar slump.

  • posterior_fossa_decompression.txt
  • Last modified: 2025/02/28 08:04
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