Neuro Pathology/Histology Flashcards
This is an example of a [?] hemorrhage
subdural (blood cannot cross midline)
This is an example of a [?] hemorrhage
epidural (blood cannot cross suture lines)
This is an example of a [?] hemorrhage
subarachnoid (blood cannot cross midline)
This is an example of a [?] hemorrhage
intraventricular and intraparenchymal
In T1-weighted MRIs, the [white/grey] matter is darker; while in T2-weight MRIs, the [white/grey] matter is darker.
In T1-weighted MRIs, the grey matter is darker; while in T2-weight MRIs, the white matter is darker.
Pathology?
multiple sclerosis (tan-colored demyelinated plaques in white matter)
Pathology?
Wallerian degeneration
(axon degenerates distal to the point of injury and macrophages ingest debris)
Pathology?
central chromatolysis
(cell body shows swelling, nuclear eccentricity, and dispersal of the Nissl substance to the periphery of the cell)
Pathology?
trick question!!
normal astrocytes stained with GFAP
Pathology?
reactive astrocytes stained with GFAP
Pathology?
Rosenthal fibers
(chronically reactive astrocytic process; lots of proteins, so brightly eosinophilic)
Pathology?
corpora amylacea
(elaboration of astrocytic processes seen in normal aging human brains; contain glucose polymers)
Pathology?
Alzheimer type II astrocyte
(large, comma-shaped vacuolated nuclei; seen in hepatic encephalopathy as a reaction to circulating toxins from liver failure)
Pathology?
trick question!!!
satellitosis
(normal clustering of up to 5-6 oligodendrocytes around neuronal cell bodies)
Pathology?
ependymal granulation
(astrocytic response to ependymal damage in encephalitis or meningitis)
normal ependymal cells shown here for comparison
Pathology?
gitter cells
(lipid-filled macrophages; a microglial response to injury)
Pathology?
rod cells
(elongated nuclei seen in microglia as a response to injury)
name the herniation categories
Pathology?
hydrocephalus ex-vacuo
(compensatory enlargement of the ventricles)
paraneoplastic syndromes can produce antibodies to neural tissue and result in ataxia; common in what cancers?
lung, ovarian, lymphatic, breast
childhood neurological disorder that causes degeneration in the cerebellum and small, widened blood vessels on the skin
ataxis-telangiectasia
inherited disorder that impairs the normal absorption of fats and fat-soluble vitamins from diet
abetalipoproteinemia
very rare inherited form of ataxia
rare inherited disease that causes progressive nervous system damage and movement problems, including ataxia
Friedreich ataxia
pathology of brain infarct: 12-18 hours
microscopic evidence of ischemia with cytoplasmic eosinophilia
pathology of brain infarct: 24 hours
softening macroscopically
pathology of brain infarct: 3 days
PMN response peaks
pathology of brain infarct: 7 days
monocyte/macrophage response peaks; macrophages are filled with fat vacuoles due to myelin
pathology of brain infarct: 2-3 weeks
astrocytosis (astrocytes act like fibroblasts to fill in void) => eventually results in cyst formation
[pathology] are minute aneurysms in small vessels that can rupture and cause hemorrhage; they are usually found in the basal ganglia
Charcot-Bouchard microaneurysms
Pathology?
laminar necrosis
(uneven cortex surface due to laminar necrosis caused by cerebral ischemia)
Pathology?
watershed infarct
(wedge-shaped areas of infarction that occur in regions of the brain and spinal cord that lie at the most distal fields of arterial irrigation; usually seen after hypotensive episodes)
Pathology?
shower embolization
(widespread hemorrhagic lesions involving the white matter seen after fractures)
Pathology?
old MCA infarct leading to cystic cavity
Pathology?
lacunar infarct
cavities due to lost tissue with scattered fat-laden macrophages and surrounding gliosis; may be clinically silent or cause severe neurological impairment
occur in the lenticular nucleus > thalamus > internal capsule > deep white matter > caudate nucleus > pons
Pathology?
brain edema with petechiae seen on autopsy following hypertensive encephalopathy
Pathology?
subarachnoid hemorrhage
usually caused by bleeding from cerebral aneurysms
Pathology?
arteriovenous malformation
Pathology?
cavernous hemangiomas
(greatly distended, loosely organized vascular channels with thin, collagenized walls
localize the stroke:
weakness and sensory loss (arm>leg); if dominant hemisphere, aphasia; eyes looking toward lesion
middle cerebral artery complete occlusion
localize the stroke:
Wernicke’s receptive aphasia
temporoparietal branch occlusion of MCA
localize the stroke:
Broca’s expressive aphasia
frontal branch occlusion of MCA
localize the stroke:
contralateral weakness
frontal motor strip branch occlusion of MCA
localize the stroke:
contralateral sensory loss
parietal sensory strip branch occlusion of MCA
localize the stroke:
hemineglect
nondominant parietal lobe branch occlusion of MCA
localize the stroke:
ideomotor apraxia
dominant parietal lobe branch occlusion of MCA
localize the stroke:
weakness and sensory loss leg>arm
anterior cerebral artery (rarer than MCA)
localize the stroke:
hoarse, difficulty swallowing, Horner’s
PICA occlusion (Wallenberg syndrome), medial part of lateral medulla (nucleus ambiguous, descending sympathetics)
localize the stroke:
ipsilateral loss of pain and temperature for face; contralateral loss of pain and temperature for body; vertigo, nausea, vomiting, nystagmus
PICA occlusion (Wallenberg syndrome), lateral part of medulla (descending trigeminal, spinothalamic tract, vestibular nuclei)
localize the stroke:
ipsilateral ataxia
PICA occlusion (Wallenberg syndrome), far lateral medulla (inferior cerebellar peduncle)
localize the stroke:
Wallenberg + tinnitus and hearing loss
AICA occlusion
localize the stroke:
limited weakness, dysarthria
paramedian pontin infarcts (lacunae)
localize the stroke:
more weakness and dysarthria; eyes looking away from lesion
large hemi-pontine infarct (lagoonar infarct)
eyes look away from lesion if 6th nerve nucleus is hit
localize the stroke:
locked-in syndrome (fully away but quadriplegic except for vertical eye moments and blink)
basilar artery occlusion where whole pons is infarcted
localize the stroke:
diplopia (Weber syndrome)
top of the basilar artery occlusion (top of the basilar syndrome), midline midbrain
localize the stroke: homonomous hemianopsia (loss of the same half of vision in both eyes)
top of the basilar artery occlusion (top of the basilar syndrome), bilateral PCA
warning signs before full basilar occlusion: vestibular nuclei
vertigo
warning signs before full basilar occlusion: corticospinal tract
hemiparesis/bilateral leg weakness
warning signs before full basilar occlusion: corticobulbar tract
dysarthria
warning signs before full basilar occlusion: cerebellar peduncle/cerebellum
ataxia
warning signs before full basilar occlusion: vestibular nucleus
nystagmus
warning signs before full basilar occlusion: lower midbrain reticular activating system
loss of consciousness
posterior circulation stroke signs
dangerous D’s: dizziness, dysphagia, dystaxia, diplopia, dysarthria, drop attacks
nasty N’s: nausea, numbness, nystagmus
picornavirus family viruses are small, [enveloped/non-enveloped], [ss/ds] [RNA/DNA] viruses
picornavirus family viruses are small, non-enveloped, ss RNA viruses
they serve as their own mRNA (do not carry RNA polymerase)
picornaviruses that cause meningitis include [?]
poliovirus types 1, 2, 3; coxsackie virus; echovirus types 1-34
picornaviruses are spread via [?]
fecal-oral route
there are no animal reservoirs, but flies can mechanically transmit viruses
name the pathogen:
paralysis caused by destruction of anterior horn cells in spinal cord and brainstem motor neurons => asymmetric flaccid paralysis with no sensory loss
poliovirus types 1, 2, 3
bulbar polio affects the pharynx, vocal cords, and diaphragm => ventilatory support or death
treatment for picornavirus infection is supportive for immunocompetent and [drug] for infants and immunodeficient
pleconoril
what vaccines exist for poliovirus?
sabin vaccine (live-attenuated organisms from all 3 strains, discontinued in US)
salk vaccine (killed virus)
name the pathogen:
vesicular lesions (hand, foot, and mouth disease) and herpes-like vesicles in buccal mucosa
Group A coxsackie virus
name the pathogen:
meningitis, myocarditis, pericarditis
Group B coxsackie virus
name the pathogen:
leading cause of viral meningitis; also causes a rash (maculopapular, petechial, or vesicular); usually self-limiting
echovirus types 1-34
name the pathogen:
protozoan parasite that accesses host through the nose, travels along olfactory nerve to the brain to cause primary amebic meningoencephalitis
Naegleria fowleri
though usually fatal within 3-6 days, some cases of N. fowleri have been successfully treated with [drug]
amphotericin B + miltefosine
name the pathogen:
long, very thin spirochet with hook on one or both ends; highly motile; transmission via contact with water, food, or soil contaminated with infected urine => entry via ingestion or abrasian
Leptospira interrogans
name the pathogen:
leptospirosis: ranges from subclinical to mild flu-like symptoms, meningitis, or severe system disease (Weil’s disease)
Leptospira interrogans
Dengue virus is [enveloped/non-enveloped], [ss/ds] [RNA/DNA] virus
Dengue virus is an enveloped, ss RNA virus
(genome serves as mRNA)
Dengue virus transmission is via [vector]
urban mosquito Aedes aegypti; common in tropical areas
name the pathogen:
fever, chills, headache, myalgias, bone pain; rash frequently present; typically extremely painful and runs its course in 5-7 days
Dengue virus
Dengue virus immunity is characterized by [?], which cause a more severe secondary infection
enhancing antibodies
infection with a second serotype => formation of immune complexes that are internalized via Fc receptors on macrophages => more efficient infection and increased replication
secondary infection with a different serotype of [virus] can cause [clinical syndrome] due to the action of enhancing antibodies
secondary infection with a different serotype of Dengue virus can cause dengue hemorrhagic fever (DHF) or dengue shock syndrome
[virus family] are enveloped, ambisense RNA
Arenaviruses
Arena viruses are enveloped, ambisense RNA viruses that cause [clinical syndromes]
Lassa, Machupo, Junin
Filoviruses are [enveloped/non-enveloped], [positive/negative] sense [RNA/DNA] viruses that cause [clinical syndromes]
Filoviruses are enveloped, negative sense RNA viruses that cause Marburg and Ebola
minor outbreaks of [virus] in the US have been associated with contact with aerosolized mouse feces/urine
hantaan virus
their vector is the deer mouse, and outbreaks of [virus] coincide with high rainfall
sin nombre virus
name the pathogen:
hemorrhagic fever or pulmonary shock syndrome (coagulopathy, petechial hemorrhage, bleeding from gums/eyes/ears/GI tract, DIC, organ failure, death)
hantaan virus
name the pathogen:
pulmonary shock syndrome (pulmonary edema, respiratory failure, death)
sin nombre virus
[virus] viral particles are bull-shaped
rhabdovirus
rhabdovirus is [enveloped/non-enveloped], [ss/ds] [RNA/DNA] virus
rhabdovirus is an enveloped, ss negative sense RNA virus
[virus] can be identified by the excess nucleocapsid material that accumulates in host cytoplasm (Negri bodies)
rhabdovirus
name the pathogen:
virus remains near bite site and replicates in local tissue, then infects peripheral nerves => retrograde axonal transport to dorsal root ganglia => travels up CNS to brain
rhabdovirus
name the pathogen:
prodromal phase: once virus reaches peripheral nerves; fever, nausea, vomiting, headache, lethargy
neurologic phase: once virus reaches CNS; depression, anxiety, hallucinations, hydrophobia, photophobia, hypersalivation, paralysis, delirium, seizures
rhabdovirus
rhabdovirus infections can be treated with [?]
rabies immune globulin (RIG) from human serum
rhabdovirus vaccine is [?]
inactivated virus prepared from purified virus
Streptococcal agalactiae are gram [positive/negative] cocci in [chains/clusters], [?]-hemolytic, catalase [positive/negative], and [?] resistant
Streptococcal agalactiae are gram positive cocci in chains, B-hemolytic, catalase negative, bacitracin resistant
the number one cause of neonatal sepsis and meningitis is [?]
Streptococcal agalactiae
name the pathogen:
respiratory distress, fever, lethargy, hypotension; pneumonia => bacteremia => meningitis
Streptococcal agalactiae
Streptococcal agalactiae is treated with [?]
penicillin or ampicillin IV, sometimes and aminoglycoside
one of the two most common causes of neonatal sepsis and meningitis, [?] has an antiphagic K1 capsular polysaccharide
Escherichia coli
[?] is the most common cause of non-neonatal meningitis in children <6 years old
Streptococcus pneumoniae
frequent cause of cortical deafness/deficits
unimmunized children <2 years old are at risk for meningitis from [?]
Haemophilus influenzae
Neisseria meningitidis is a gram [positive/negative] [shape] transmitted via [?]
Neisseria meningitidis is a gram negative diplococci transmitted via airborne droplets
name the pathogen:
meningococcemia (skin involvement - petechial rash, may produce purpura); meningitis; fulminating meningitis; Waterhouse-Friedrichsen syndrome (DIC and shock)
Neisseria meningitidis
Neisseria meningitis tests:
[?] is positive for glucose only, while [?] is positive for glucose and maltose
N. gonorrhoeae is positive for glucose only, while N. meningitidis is positive for glucose and maltose
Neisseria meningitidis infection is treated with [?]
penicillin G (alternatives = ceftriaxone, chloramphenicol)
prophylaxis for close contacts of someone infected with Neisseria meningitis includes [?]
rifampin
Pathology?
acute pyogenic meningitis (S. pneumoniae; suppurative inflammation)
Pathology?
H. influenzae meningitis (basal inflammation)
Pathology?
Neisseria meningitidis
last photo is Waterhouse-Frederichson syndrome: overwhelming meningococcemia leads to massive hemorrhage in the adrenal glands
Pathogen?
S. pneumoniae
gram positive cocci arranged in pairs (gram positive diplococci)
Pathogen?
Neisseria fowleri
gram negative cocci arranged in pairs (gram negative diplococci)
Pathogen?
H. influenzae
(gram negative rod)
Pathology?
brain abscess
centrally liquefactive necrosis, surrounded by fibrous capsule, associated cerebral edema
Pathology?
brain abscess
centrally liquefactive necrosis, surrounded by fibrous capsule, associated cerebral edema
Pathology?
tuberculous meningoencephalitis
creamy or gelatinous exudate centered at the base of the brain
Pathology?
caseating granuloma in tuberculous meningoencephalitis
Pathology?
obliterative endarteritis
severe proliferating endarteritis; a complication of tuberculous meningoencephalitis
Pathology?
tuberculoma
inflammation may become localized and form a mass-like lesion; a complication of tuberculous meningoencephalitis
Pathology?
pott disease
vertebral tuberculosis (collapse of vertebral bodies with resultant spinal cord compression); complication of tuberculous meningoencephalitis
HIV is a spherical, [enveloped, non-enveloped], [ss/ds] [RNA/DNA] virus
HIV is a spherical, enveloped, positive sense ss RNA virus
genome elements found in retroviruses:
pol: encodes RT, IN, and protease
env: encodes gp120 and gp41
gag: encodes nucleocapsid, capsid, matrix proteins
long terminal repeat: regulates viral gene expression
genome elements unique to HIV-1:
tat: boosts expression of viral genes
rev: promotes viral RNA transport from nucleus to cytoplasm
[?] is a structural protein that makes up most of the HIV viral core (capsid); measurement provides indication of viral load
p24
HIV viral DNA is detectable [?] after infection, p24 is detectable [?] after RNA
HIV viral DNA is detectable 10 days after infection, p24 is detectable 4-10 days after RNA
Pathogen?
toxoplasma gondii
intracellular tachyzoite within macrophage
Pathogen?
toxoplasma gondii
bradyzoite or cyst in brain tissue
Pathogen?
cryptococcus neoformans
India ink stain
Pathogen?
pneumocystis jirovecii
trophozoites stained with giemsa (can also be visualized with Gomeri stain)
Pathogen?
kaposi’s sarcoma
non-tender, purple-reddish maculopapular skin lesions caused by human herpes virus 8
Pathology?
Primary CNS lymphoma
single lesion; contrast enhancing
Pathology?
toxoplasmosis
multiple ring-enhancing lesions
Pathology?
progressive multifocal leukoencephalopathy
lesions occur int he white matter and DO NOT have an enhancing rim
name the pathogen:
obligate intracellular parasite found within macrophages; main reservoir is the house cat, intermediate hosts include sheep and cattle
toxoplasma gondii
name the pathogen:
reactivation disease in immunocompromised individuals includes encephalitis, cerebral mass lesions, pneumonitis, chorioretinitis, and systemic disease
toxoplasma gondii
in infected pregnant women, newborns, and infants, toxoplasmosis is treated with [?]
pyrimethamine, suladiazine
name the pathogen:
asexual growth as budding yeast at both 25 and 37 degrees (NOT dimorphic); found in the excrete of pigeons (NO person-to-person transmission)
cryptococcus neoformans
name the pathogen:
primary infection occurs in the lung (usually asymptomatic); hematogenous spread => meningitis, disseminated disease (skin and bone lesions, brain abscess), leading cause of fungal meningitis
cryptococcus neoformans
name the pathogen:
primitive fungus that lacks ergosterol; transmitted via droplet inhalation
pneumocystis jirovecii
name the pathogen:
onset usually insidious; bilateral diffuse interstitial pneumonitis (ground glass appearance radiographically) with plasma cell infiltrates
pneumocystis jirovecii
name the pathogen:
identified in tissue specimen or lavage fluids using Gomeri silver stain or Giemsa stain
pneumocystis jirovecii
pneumocystis jirovecii is treated with [?]
TMP/SMX
resistant to antifungal drugs due to absence of ergosterol
cytomegalovirus is a large [enveloped/non-enveloped], [ss/ds] [RNA/DNA] virus
cytomegalovirus is a large, enveloped, linear ds DNA virus
buds from nuclear membrane
name the pathogen:
ubiquitous; transmitted via direct person-to-person contact, sexually, blood transfusions, tissue transplants, and from mother to infant before/during/after birth; can be isolated from tears, saliva, pharynx, semen, cervical secretions, peripheral blood leukocytes, amniotic fluid, and urine
cytomegalovirus
name the pathogen:
usually asymptomatic; reactivation disease in immunocompromised host = interstitial pneumonia, retinitis, esophagitis, GI tract upset
cytomegalovirus
cytomegalovirus treatment
ganciclovir, cidofovir, foscarnet
primary CNS lymphoma is a diffuse, large cell non-Hodgkin lymphoma of B cell origin caused by [?]
Epstein Barr virus
name the pathology:
lethargy, headache, personality changes, memory loss, confusion, weakness, seizures, cranial nerve involvement
primary CNS lymphoma (caused by EBV)
progressive multifocal leukoencephalopathy is caused by [?]
polyoma virus JC
polyoma virus JC is a [enveloped/non-enveloped] [ss/ds] [RNA/DNA] virus that causes [?]
polyoma virus JC is a non-enveloped ds DNA virus that causes progressive multifocal leukoencephalopathy
name the pathology:
EMG:
slow repetitive nerve stimulation => decremental response
fast RNS or exercise => incremental response
Lambert-Eaton myasthenic syndrome (LEMS)
Lambert-Eaton myasthenic syndrome symptoms can be treated with [?]
pyridostigmine (cholinesterase inhibitors)
name the pathology:
EMG:
slow repetitive nerve stimulation => decremental response
fast RNS or exercise => no incremental response
myasthenia gravis
myasthenia gravis is treated with [?]
pyridostigmine
immunosuppressants (steroids, azathioprine, mucophenylate, IVIG, and plasma exchange)
thymectomy
name the neuropathy:
pain, paresthesia, and sensory loss in thumb, index, and lateral half of ring fingers of affected hand; weakness of thumb abduction and atrophy of thenar eminance
median nerve entrapment (carpal tunnel syndrome)
name the neuropathy:
decreased grip and problems with finger dexterity; numbness of little finger and half of ring finger
ulnar neuropathy
name the neuropathy:
wrist drop, finger drop, and weakness of supination; mild elbow flexion weakness
radial neuropathy
name the neuropathy:
weakness of tow and foot dorsiflexion and foot eversion; sensory loss over dorsum of foot and lateral distal lower extremity
peroneal neuropathy
name the neuropathy:
paresthesia of lateral thigh
lateral femoral cutaneous neuropathy
name the radiculopathy:
weakness of shoulder abduction, elbow flexion, wrist flexion/extension; sensory loss of lateral forearm, thumb, and index finger; loss of biceps and brachioradialis reflex
C6 radiculopathy
name the radiculopathy:
weakness of elbow and wrist extension, sensory disturbance of middle finger, pain in neck and dorsum of forearm, loss of triceps reflex
C7 radiculopathy
name the radiculopathy:
acute back pain radiating around the anterior aspect of the thigh down into knee and occasionally down the medial aspect of lower leg as far down as the arch of the foot
L2, 3, 4 radiculopathy
name the radiculopathy:
back pain that radiates down lateral aspect of the leg into the dorsum foot; decreased strength in foot dorsiflexion, toe extension, and foot eversion; leg abduction weakness in severe cases; atrophy of extensor digitorum brevis muscle of foot and tibialis; reflexes are normal
L5 radiculopathy
name the radiculopathy:
pain radiates down posterior aspect of leg into foot from the back; weakness of plantar flexion, leg extension, and knee flexion; sensation reduced on posterior leg and lateral edge of the foot; loss of ankle reflex
S1 radiculopathy
Pathology?
necrotic muscle fiber amid normal ones
Pathology?
increase in inflammatory cells to digest dead myocyte
Pathology?
regenerating muscle (central enlarged nuclei with prominent nucleoli in a basophilic cytoplasm)
Pathology?
fiber type grouping (muscle fiber response to injury/atrophy followed by regeneration)
compare to normal checkerboard pattern (here)
Pathology?
Duchenne muscular dystrophy (dystrophin absent) or Becker muscular dystrophy (dystrophin defective)
myofiber hypertrophy => myofibers degenerate and replaced by adipose tissue and endomysial fibrosis
Pathology?
mitochondrial myopathy
ragged red fibers due to aggregates of abnormal mitochondria
Pathology?
inclusion body myositis
trichrome stain = myofibers containing rimmed vacuoles (inclusions with reddish granular rimming)
autosomal recessive (22q) deficiency in lysosomal enzyme arylsulfatase A
metachromatic leukodystrophy
autosomal recessive (14q31) deficiency in galactocerebroside-b galactosidase
Krabbe globoid cell leukodystrophy
X-linked recessive loss of function mutations in ABCD1, which encodes a protein needed to transport fatty acids into peroxisomes
adrenoleukodystrophy
Pathology?
Krabbe globoid cell leukodystropy
deficiency in galactocerebroside-b galactosidase
CNS and PNS demyelination with yellow/gray discoloration of white matter; globoid cells (large, multinucleated macrophages filled with abnormal lipid breakdown products)
Pathology?
Wernicke Korsakoff
small mamillary bodies; petechiae in mammillary bodies
Pathology?
vitamin B12 deficiency
degeneration of spinal white matter, which is concentrated in the posterior and lateral columns of the spinal cord
Pathology?
degeneration of cerebellar vermis due to chronic ethyl alcohol use
Pathology?
hepatic encephalopathy
liver failure leads to disturbed consciousness, asterixis, and elevated serum ammonia => Alzheimer type II astrocytes in brain (large gray matter astrocytes with intranuclear glycogen)
the only medication currently approved for primary progressive MS is [?]
ocrelizumab
Pathology?
multiple sclerosis plaque
Pathology?
multiple sclerosis plaque
Pathology?
multiple sclerosis plaque showing macrophages and lymphocutes
Pathology?
perivascular lymphocytes in MS plaque
Pathology?
gliosis seen in a healed MS plaque
Pathology? (right image; left is normal comparison)
Parkinson disease
loss of pigmented catecholaminergic neurons
Pathology?
Lewy body in a substantia nigra neuron (Parkinson disease)
Pathology?
Lewy body in a substantia nigra neuron (Parkinson disease)
Pathology?
Huntington’s disease
gross: small brain with severe atrophy of caudate nucleus and putamen
histology: protein aggregates containing huntingtin in neurons of striatum and cerebral cortex
Pathology?
diffuse astrocytoma
increased density of astrocytes without the histological features associated with high grade astrocytomas
Pathology?
glioblastoma
necrosis shows a pseudo-palisaded appearance
Pathology?
glioblastoma
some areas firm and others are soft due to necrosis
primary GBM = de novo in older patients, typically IDH-wildtype; secondary GBM = arise from lower grade precursor lesion in younger patients, IDH mutations
Pathology?
pilocytic astrocytoma
gross: most common in cerebellum; limited infiltration of surrounding brain
histology: long, thin, “hairlike” processes that form dense fibrillary meshworks; rosenthal fibers and eosinophilic granular bodies
DO NOT have IDH mutatations
common in children and young adults
Pathology?
oligodendroglioma
fried egg appearance
IDH mutation and 1p/19q codeletion REQUIRED for diagnosis
Pathology?
ependymoma
micro: rosettes
Pathology?
medulloblastoma
predominantly in children; exclusively in cerebellum
micro: very densely cellular with sheets of anaplastic cells and rosettes
Pathology?
meningioma
predominately benign tumors of adults
Pathology?
meningioma
micro: psammoma bodies
Pathology?
traumatic neuroma
micro: mixture of axons, Schwann cells, and connective tissue
Pathology?
schwannoma
Antoni A: highly ordered cellular component
Antoni B: loose myxoid component
Pathology?
neurofibroma
Pathology?
plexiform neurofibroma
Pathology?
malignant peripheral nerve sheath tumor
Pathology?
lacunar infarcts
Pathology?
lacunar infarcts
fat-laden (foamy) macrophages and gliosis surrounding a cavity
Pathology?
Alzheimer’s
brain atrophy
Pathology?
Alzheimer’s
dystrophic neurites around central amyloid core
Pathology?
Alzheimer’s
neurofibrillary tangle within neuron
Pathology?
frontotemporal degeneration
