HistoPath - General Flashcards
On slide: cell that is 4x RBC size, multi-lobular with lots of granules
Neutrophils
On slide: large cell with lots of cytoplasm
Macrophage
On slide: large cell, purple colour
Lymphocytes
On slide: 4x RBC size, bi-lobed nucleus (blue), red/pink granules
Eosinophils
On slide: 4X RBC size, granules of histamine and heparin
Mast cells
Tumour that produces keratin, has intracellular bridges (prickles), no glands
Squamous cell carcinoma
Tumour that has glandular epithelium and produces mucin
Adenocarcinoma
Tumour found in the bladder, kidney, ureters
Transitional cell carcinoma
Stains Iron in haemochromatosis
Prussian Blue
Stain for amyloid
Congo red → apple green birefringence
Stains melanin
Fontana
Stain used for most histo samples
Haematoxylin (blue nucleus) and eosin (pink/red cytoplasm)
Immunohistochemical marker of the epithelium
Cytokeratin
Immunohistochemical marker of lymphoid tissue
CD45
Immunohistochemical marker of primary bowel cancer
CK20 and CK7
Immunohistochemical marker of neuroendocrine tumours
Chromogranin
70% occlusion of the coronary vessels
Stable angina
> 90% occlusion of the coronary vessels
Unstable angina
Type of flow that predisposes to atheroma
Turbulent
Prinzmetal angina
Coronary artery spasm
Time taken for there to be irreversible damage and myocyte death on MIs
> 20-40mins
Histology for heart tissue <6 hours after MI
No change
Histology for heart tissue 6-24 hours after MI
Myocyte necrotic death
Histology for heart tissue 1-4 days after MI
Inflammatory cell infiltration → macrophages seen
Histology for heart tissues 5-10 days after MI
Removal of debris
Histology for heart tissue 1-2 weeks after MI
Myofibroblasts, new vessels, collagen synthesis, granulation tissue
Histology for heart tissue >2 weeks after MI
Decellularising scarring, strengthening
Heart is pale and oedematous
24h post MI
Heart has haemorrhage, signs of necrosis
3-4 days post MI
Heart is thin an yellow
1-2 weeks post MI
Heart is tough and white
> 3 weeks post MI
complications within 24h of MI
Arrhythmia → VF
Sudden death
cardiogenic shock
Complications of MI 1-3 days after
Fibrinous pericarditis
Complications of MI 3-14 days after
Papillary muscle rupture → mitral regurgitation
LV free wall rupture
Ventricular septal rupture
Complications of MI weeks to months after
Dressler’s syndrome
Heart failure
Reinfarction/recurrence
Aneurysm (atria or ventricles)
Dilated heart, scarring and thinning of the walls with fibrotic replacement of the ventricular myocardium
Heart failure
Boggy and thin heart with systolic dysfunction
Dilated cardiomyopathy
Heart is stiff with a loss of contractility
Restrictive cardiomyopathy
HOCM inheritance
Autosomal dominant
Thickening of valve leaflet, especially along lines of closure and fusion of commissures
Thickening, shortening and fusion of chordae tendineae.
Chronic rheumatic valve disease
mid-systolic click + late systolic murmur in middle aged woman with SOB and chest pain
Mitral valve prolapse
Ejection systolic murmur (+ cause)
Aortic stenosis - calcification, bicuspid
Pansystolic murmur (+ cause)
Mitral regurgitation - post MI, RhF, infective endocarditis, connective tissue disease
Mid-diastolic murmur (+ cause)
Mitral stenosis - RhF
Ejection diastolic murmur (+ cause)
Aortic regurgitation - connective tissue disease. aneurysm, IE
Ejection diastolic murmur (+ cause)
Aortic regurgitation - connective tissue disease. aneurysm, IE
Histo: aschoff bodies (Small giant cell granulomas) and Anitschkov mycoytes (Regenerating)
Rheumatic fever
Warty vegetations on valve leaflet
Rheumatic endocarditis
Large irregular masses on valve cusps that extend to the chordae tendinae
Infective endocarditis
Small, bland vegetation on the valves
Non-bacterial thrombotic endocarditis
small, sterile, platelet-rich plaques
Libman Sacks
Cortex forced under the falx cerebri
Subfalcine
Median temporal lobe forced under the tentorial notch
Uncal (transtentorial)
Cerebellum forced through the foramen magnum
Tonsilar
Most likely area for infarction stroke
Basilar artery
Carotid bifurcation
Middle cerebral artery (Emboli from the heart)
Most likely area for haemorrhagic stroke
Basal ganglia
Closely packed vessels with no parenchyma interposed between vascular spaces under low pressure
Cavernous angioma
Target sign on MRI brain
Cavernous angioma
Most common site of sub arachnoid haemorrhage
Internal carotid bifurcation
Bruising behind the mastoid process and around the eyes
Basilar skull fracture
Coup vs Contrecoup
Coup = damage to area of collision
Contrecoup = damage to opposite side of the brain due to rebound
Pick’s bodies
Fronto temporal dementia with tau
unilateral cerebral atrophy and progranulin mutation
Frontotemporal dementia (Tau negative)
alpha synuclein and ubiquitin
Dementia with lewy bodies
Histology of brain: PAPP-LANTOS bodies, glial cells, tufted astrocytes
Progressive supranuclear palsy
Histology of brain: oligodendrocytes containing alpha-synuclein
multiple system atrophy
Presents with aphasia and “alien limb”
Corticobulbar degeneration
Fronto-temporal atrophy, marked gliosis and neuronal loss, balloon neurons, pick bodies
Pick’s disease - Fronto-temporal dementia with Tau
Western blot: 3 dense bands → dephosphorylated to show 3R and 4R tau
Alzheimer’s dementia
Western blot: 2 dense bands → dephosphorylated to show 4R tau
CBD or PSP
Western blot: 2 dense bands → dephosphorylated to show 3R tau
Pick’s (Tau positive fronto-temporal dementia)
protein deposits with spongiform change (lots of vacuoles in the brain)
Prion disease
Mutation 17q11 (NF1)
Pilocytic astrocytoma
Neurofibroma
Mutation 22q12 (NF2)
Schwanomma
Meningioma
MRI: cerebellar lesion, well-circumscribed
Histo: hairy cells, rosenthal fibres, granular bodies
Pilocytic astrocytoma
MRI: hemispheric lesion, non-enhancing
Genetics: IDH1/2 mutation
negligible/absent mitotic activity, vascular proliferation and necrosis absent
Diffuse astrocytoma
MRI: enhancing lesion, heterogenous
Cytology: microvascular proliferation
Histology: high mitotic activity, high cellularity, blood vessel growth
Glioblastoma
MRI: non-enhancing lesion
Cytology: fried egg cells (lots of cytoplasm)
Histology: IDH1/2 codeletion
Oligodendroma
MRI: enhancing lesion
Histology: attaches to the meninges, does not invade it. Globule seen
Meningioma
Histo: small blue round cells and homer-wright rosettes
medulloblastoma
intrepithelial, intracellular oedema
Spongiotic inflammation
epidermal hyperplasia
psoriasiform inflammation