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A brain abscess is a focal, intracerebral infection characterized by a localized collection of pus within the brain parenchyma, resulting from microbial invasion and the body’s inflammatory response. It progresses through stages: early and late cerebritis, followed by early and late capsule formation, reflecting tissue destruction, immune response, and eventual encapsulation.Etiology and PathogenesisCausative organisms vary with source and host factors, often involving polymicrobial infections,...
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Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
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Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
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The superior view of the cranium shows the frontal and paired parietal bones.
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Supratentorial PNET in a young child.

Amarendra Narayan Prasad1

  • 1Military Hospital Namkum, Ranchi, 834010 Jharkhand, India. amarendraprasad@rediffmail.com

Indian Journal of Pediatrics
|January 8, 2011
PubMed
Summary
This summary is machine-generated.

Primitive Neuroectodermal Tumors (PNET) are small, malignant embryonal tumors with varied differentiation. These tumors, including medulloblastoma and neuroblastoma, belong to the Ewing family of tumors.

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Area of Science:

  • Oncology
  • Pathology
  • Developmental Biology

Background:

  • Primitive Neuroectodermal Tumors (PNET) are a group of rare, aggressive embryonal neoplasms.
  • PNETs are characterized by small, undifferentiated cells and exhibit divergent differentiation potential.
  • These tumors are classified under the broader category of Ewing tumors.

Observation:

  • PNETs demonstrate variable differentiation into neuronal, glial, or mesenchymal lineages.
  • Common PNETs include medulloblastoma, pineoblastoma, neuroblastoma, and retinoblastoma.
  • Ependymoblastoma is recognized as a specific type or synonym for PNET.

Findings:

  • PNETs represent a spectrum of embryonal tumors with diverse histological features.
  • The classification of PNETs highlights their shared cellular origin and malignant potential.
  • Understanding PNET differentiation is crucial for accurate diagnosis and treatment strategies.

Implications:

  • Accurate classification of PNETs aids in targeted therapeutic approaches.
  • Further research into PNET differentiation may reveal novel therapeutic targets.
  • Improved understanding of PNETs can lead to better patient outcomes in neuro-oncology.