More Related Content Similar to L75- Pathology of CNS Tumors.ppt Similar to L75- Pathology of CNS Tumors.ppt (20) L75- Pathology of CNS Tumors.ppt2. CNS Tumors
Limited space, filled by Delicate vital structure..
Normal brain is semifluid in consistency….!
Highly sensitive to hypoxia, Critical blood supply
Increased pressure – destructive.
Location determines nature than the tumor
itself.
Common site of metastasis.
General Considerations
3. CNS Tumors
General Considerations
Comprise: 10% of all tumors
Most common childhood neoplasms
Peak incidence at 5th decade
Supratentorial tumors in adults
Infratentorial tumors in childhood
Primary tumors infiltrative
Metastasis well-demarcated
Intraneural spread, no extraneural spread
4. CNS Tumors
Simple Classification:
1. Primary Tumors:
Mainly from supporting glia, nerve
sheath, primitive cells, blood
vessel/bone.
2. Secondary Tumors - metastasis from
Ca breast, lung, GIT etc.* Commonest.
“Mature Neurons do not give rise to neoplasms.”
(Permanent cells)
5. CNS Tumors
Primary brain tumors.
Meninges: meningioma
Glia -
Astrocytes - astrocytoma
Oligodendrocytes - oligodendroglioma
Ependyma – ependymoma, choroid plexus
papilloma, colloid cyst (Ventricles).
Primitive cells: “blastoma” e.g. neuroblastoma.
Neuronal * : ganglioglioma, gangliocytoma
Nerve sheath: schwannoma, neurofibroma
Pituitary: adenoma, craniopharyngioma
Vascular & Bone tumors:
6. CNS Tumors
Clinical features:
Raised Intracranial Pressure.
Headache, vomiting, slow pulse,
papilledema.
Local damage:
Nerve & tract deficits, Paralysis,
seizures etc.
7. CNS Tumors
Meningioma:
Arise from arachnoid granulations of
venous sinuses. Attached to dura.
Common sites: parasagittal (falx), sphenoid
ridge, olfactory groove
Females common (2:1)
Well demarcated – Compression - No Invasion
Microscopic: whorls and psammoma bodies
Hyperostosis over the tumor.
Slow growth, well differentiated, no spread
(Benign).
15. CNS Tumors
Glioma:
Gliomas are neoplasms of glial cells.
Astrocytoma – Commonest benign
tumors with malignant behavior.
Ependymoma – Rare, 4th ventricle.
Oligodendroglioma – Benign, adults,
rare.
16. CNS Tumors
Astrocytoma
Astrocytoma – Commonest tumors of
adults. (80%)
Well differentiated, slow growing.
Benign - but malignant behavior.
Infiltrative, poor demarcation
Glioblastoma Multiforme -
Malignant form of Astrocytoma.
18. CNS Tumors
Fibrillary astrocytomas
Grossly solid
Common in cerebral hemispheres
Low grade in young, higher grade in
older
Grading
astrocytoma (low grade)
Anaplastic astocytoma
glioblastoma multiforme (high grade)
20. CNS Tumors Fibrillary astrocytoma:
microscopic
Low grade- hypercellularity, pleomorphism
Anaplastic- as above plus mitosis, vascular
endothelial proliferation
Glioblastoma multiforme- as above plus
necrosis and pseudopalisades. Grossly
variegated appearance (multiforme)
33. CNS Tumors
Pilocytic astrocytoma
Common in childhood
Most slow growing of the gliomas
Sites: cerebellum, around III V., optic nerve
Grossly cystic with mural nodule
Microscopic
elongated hair-like (pilo) elongated cells
Rosenthal fibers
38. CNS Tumors
Neuroectodermal Tumors
Origin from primitive blast cells.
Rosettes - attempted nerve formation.
1. Medulloblastoma – Cerebellum
2. Retinoblastoma - Retina
3. Neuroblastoma – Adrenal glands
4. Ganglioneuroma - Mediastinum
49. CNS Tumors
Nerve Sheath Tumors:
Neurofibroma:
Epi & endoneurial fibroblasts.
Form whorls of fibroblasts
Well differentiated, benign,
Two types:
Classic form - Cutaneous / nerve - Solitary
collagen matrix, spindle cells,
Plexiform - Multiple, infiltrative, myxoid.
50. CNS Tumors
Nerve Sheath Tumors:
Schwannoma:
Schwann cells, form whorls
Nuclear palisading
Antoni A & B pattern.
Verocay bodies.
58. CNS Tumors
Neurofibromatosis:
Type I (common):(AD, 17q, 1:3000)
Plexiform & solitary neurofibromas
Optic nerve gliomas, Lisch nodules, Café au lait
spots.
Type II (rare):(22q, 1:40,000)
Bilateral acoustic schwannoma/osis
Multiple meningioma/osis, ependymoma of
spinal cord
59. CNS Tumors
Phakomatosis (Neurocut. dysplasia)
• Neurologic abnormalities + defects of skin or
retina (ectodermal).
• Neurofibromatosis (von Recklinghausen)
• Tuberous Sclerosis
• Sturge-Weber Sy (Encephalofacial
Angiomatosis)
• von Hippel-Lindau Disease
• Neurocutaneous Melanosis
60. CNS Tumors
Neurofibromatosis - Von Recklinghausen
Dominant inheritance
Multiple neurofibromas
Central - CNS
peripheral nerves
Increased incidence of:
meningioma
glioma
schwannoma - bilateral VIII N.
Cafe-au-lait (melanosis) in skin
Elephantiasis: increased connective
tissue
66. CNS Tumors
Tuberous Sclerosis
1. Dominant inheritance
2. Clinical triad:
seizures
mental retardation
adenoma sebaceum
3. Retinal hamartoma (phakoma)
4. Tubers in cerebral cortex
5. Subependymal giant cell astrocytoma
6. Hamartomas in other organs: heart, kidney
72. CNS Tumors
Peripheral nerve tumors
Schwannoma
Schwann cells
Compress the nerve
trunk
Encapsulated
Easily resectable without
nerve damage
Microscopic:
Antony A and B fibers
Verocay bodies
Neurofibroma
Schwann cells, neurites,
fibroblasts
Fusiform and involves
nerve trunk
Not encapsulated
Not resectable without
sacrificing nerve
Micro- Intermingled cells
with wavy nuclei
73. CNS Tumors
Brain Tumors: Microscopic
Tumor Microscopic
Meningioma Whorls and psammoma
bodies
Glioblastoma Pseudopalisades
Oligodendroglioma Mosaic/poached-egg
Ependymoma Perivascular pseudorosettes
Medulloblastoma Rosettes (Homer-Wright)