pathology - unil.ch · pathology in the . robbins textbook. etiology. mechanisms. morphology of...
TRANSCRIPT
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PathologyModule B2.1Practical Class
Maryse Fiche, Audrey Baur-Chaubert, and Dominique Sandmeier
participated in the design of this session.
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Welcometo the Pathology practical
classes program.
Please follow the powerpoint guide!
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Learning ObjectivesAfter this first class
You should be able to:• Define Pathology,• Observe a gross specimen,• Explain the steps to the realization of a tissue
section,• Compare a normal tissue and a diseased tissue,• And find in the textbook information pertaining to
the lesion you observe on gross specimen and tissue sections.
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The pathologists teaching thislaboratory session are :
Drs ..
from the Institut Universitaire de Pathologie
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The Micropolis classes are based on a powerpoint file
that contains empty sections, to be filled inFor example :
. Answer a question (write text)
. Find an illustration :
-a photograph of a tissue section taken using your microscope-A figure, table,.. From the Robbins textbook
or other sources that will be indicated to you.
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This session comprises 4 steps.
The time recommended for each step is indicated
(just follow the power point guide).
You can keep your work at the end of the session.
A corrected file will be available.
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Step 1:Introduction to Pathology
Recommended time : approximately 15 minutes
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Step 1:
DiseasesPathology
The Robbins textbookPathology laboratory classes
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You have known of ill people.From which diseases did they suffer?Find in your small group 4 examples of disease.
- disease 1 :
- disease 2 :
- disease 3 :
- disease 4:
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CompareThe sample of diseases that you
have identified
With this ranking of the diseases sources of death in the USA (in
2002)
FORMAL NAME INFORMAL NAME % ALL DEATHS
(1) Diseases of the heart heart attack (mainly) 28.5%
(2) Malignant neoplasms cancer 22.8%
(3) Cerebrovascular disease stroke 6.7%
(4) Chronic lower respiratory disease emphysema, chronic bronchitis 5.1%
(5) Unintentional injuries accidents 4.4%
(6) Diabetes mellitus diabetes 3.0%
(7) Influenza and pneumonia flu & pneumonia 2.7%
(8) Alzheimer's Disease Alzheimer's senility 2.4%
(9) Nephritis and Nephrosis kidney disease 1.7%
(10) Septicemia systemic infection 1.4%
(11) Intentional self-harm suicide 1.3%
(12) Chronic Liver/Cirrhosis liver disease 1.1%
(13) Essential Hypertension high blood pressure 0.8%
(14) Assault homicide 0.7%
(15) All other causes other 17.4%
Source: National Vital Statistics Report, Volume 53, Number 5 (October 2004)]
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Step 1:
DiseasesPathology
The Robbins textbookPathology laboratory classes
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Pathology:
Etiology Mechanisms Morphology
of lesionsClinic
The study of diseases includes these 4 aspects:
Macroscopy
microscopySee Robbins
7è & 8è Ed. page 4
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Pathology:
Etiology Mecanisms Morphology
of lesionsClinic
The study of diseases includes these 4 aspects:
Macroscopy
microscopy
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pathologists are, like histologists, Are morphologists
Pathology:
Etiology Mecanisms Morphology
of lesionsClinic
The study of diseases includes these 4 aspects:
Macroscopy
microscopy
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Etiology MéchanismsMorphology of Lesions Clinic
Tobacco
example : bronchial cancer
metaplasiaNeoplasia
Gross: bulk in a bronchusMicro:carcinoma
Nothing, silenc
cough
Bloody expectoration
abnormal Imag
Evolution :death
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You can observe the squamous metaplasiaof the bronchial epithelium on section number 2
Your turn :
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Section 2 : insert here two imagesnormal bronchialepithelium
Metaplasia : transformation of a normal tissue (here: a respiratory epithelium: non-stratified, with ciliated cells and mucin secreting cells) into another normal epithelium (here: a squamousepithelium, multi-stratified, with no ciliated nor mucin secreting cells).
metaplastic epithelium
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Step 1:
DiseasesPathology
The Robbins textbookPathology laboratory classes
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Robbinsa reference for medical students and doctors
The Content pages (Xiii et XiV)
show you that the textbook comprises two parts:
. General pathologyand
. Systemic Pathology
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General Pathology is the study of the mechanisms of disease : inflammation, neoplasia,…
Diseases in various organs : liver, heart, .... Involve various mechanisms.
Robbins
during steps 2 and 3 you will be able to use:
Chapters 1 & 2 : cellular adaptation
andchapiter 18 7/8th edition: liver diseases.
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Pathology in the Robbins textbook
Etiology MechanismsMorphology of Lesions
Clinic
Macroscopy
Microscopy
Robbins 1st part
-Cellular death and adaptation
-Thrombosis embolie
-Inflammation reparation
-Neoplasia
« Pathogenesis »
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Pathology in the Robbins textbook
Etiology MechanismsMorphology of Lesions
Clinic
Macroscopy
Microscopy
Robbins 1st part
Robbins 2nd part: by organ
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If you look in the index for « steatosis »
You will find:
-Steatosis as a mechanism of disease (p…)
- steatosis in différent organs (p…)
Example
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Step 1:
DiseasesPathology
The Robbins textbookPathology laboratory classes
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lectures
Etiology Mechanisms Morphology of Lesions Clinic
Gross
Microscopy
Laboratory sessions
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Some assessment questions will address practical class content
S. Lakhani
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Instructors are available for questions
about step 1
You can now start
Step 2.
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Step 2Gross &
Microscopy50 minutes
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Etiology Mechanisms Morphology
of lesionsClinic
Gross
Microscopy
Step 2
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Step 2Gross Micro
You are expected to::
1 . READ the next 6 slides2 . Go to the tables near the windows
3 . Return to your tables and continue.
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You have:
2 clinical histories-Mr Peter S.-Mr Paul H.
4 gross spécimen- No 1 : normal liver, no lesion- No 2, 3 et 4 : livers with lesion
4 histological sections- section A : normal liver- sections B and B’ : one liver, two sections- section C: a liver with a lesion
A textbook: Robbins
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Objectives for step 2: to-Observe
- liver gross specimen
- liver tissue histological sections
- two liver diseases;
-compare normal and diseased liver;
-describe the gross and et microscopic lesions of liver parenchyma associated with the two diseases.
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Etiologie MécanismesMorphologie des Lésions
Clinique
Macroscopie
Microscopie
You will have to
ASSOCIATE, RELATE
1- Each of two clinical histories and
2- one gross specimen : 2, 3, or 4
3- one tissue section : B-B’ or C
1
2
3
I could not correct this but the words are in French
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Mr Peter S.
56-year-old, a real estate agent, shares his time between his job, his motor boat, and his friends. His big belly contrasts with thin arms and legs. He reports an important beer intake.
Mr Paul H.
48-year-old, bank employee, has a tan grey complexion. Recently, he felt tired and had vague abdominal pains. He lost a little weight, but feels as if his belly was enlarged. His doctor discovers diabetes.
2 clinical stories
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Your task: to determine which of the livers you observe could be Peter’s
(and which one could be Paul’s)
and WHY?
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Now: stop with the computers and microscopes and go and observe the gross specimens.
Pathologists study gross lesions on surgical specimens and on autopsy specimens
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4321
4 gross specimens10 cm
Normal
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What we can observe :
• The size of the liver (of the section at least)• Its weight will be indicated.• Its aspect :
– color?– homogeneous or heterogeneous (e.g.:
nodules or no nodules) ?
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1 : normal liver
Weight: 1650 g size: Color: Aspect homogeneous or heterogeneous:
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2
Weight: 2500 g size: Color: Aspect homogeneous or heterogeneous:
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3
Weight: 1200 g size: Color: Aspect homogeneous or heterogeneous:
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4
Weight: 2200 g size: Color: Aspect homogeneous or heterogeneous:
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But …
What color are, for the naked eye :
- bile : …………..- fat : ………………..
- Iron (oxydated): ……………..
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microscopy
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A. Human liver biopsy
The H.E. stain: Hemalun Eosin
nuclei violet
cytoplasm pink
the routine stain in tissue pathology
A
Information on the tissue sections that you are going to observe
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When a liver disease is suspected, the microsocpic examination of a piece of liver tissue is often a useful complement to clinical and serum data.
The lesions observed in the tissue will contribute to a final correct diagnosis.
Do you know the technical steps needed to obtain an observable tissue section?
Fi…….
In…… St…
C……
4 tissue sectionsA few words about the technique
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sample
Technical steps:
Fixation
Inclusion: «block»
Cut
Stainsampling
Tissue sections
Are stained and then mounted between two glass slides.
Non invasive
Surgery or autopsy
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A
This liver sample was obtained through a trans-jugular biopsy.
The sample is fixed in a buffered formalin solution for several hours and then embedded in paraffin, first liquid, hot, then solid (when it gets cold).
It can then be stored as a block, from which numerous 4-microns thick sections can be cut on a microtome.
These sections are then stained in various solutions.
Fixation, Inclusion, cut and stain: these steps require3 to 48 hours.
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After fixation in Formalin, and then dehydration in alcohol, a small piece of tissue is embedded in paraffin (liquid, that then solidifies)
Block
photos : Gilles Weber CEMCAV CHUV Lausanne
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The block is cut using a microtome into 4-microns sections.
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Coupes de 4 microns d’épaisseur
The block is cut, using a microtome, into 4-microns sections.
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4-microns thick sections
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This work is done by professionals, laboratory technicians.
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The sections are laid onto glass slides
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They are stained in different solutions.
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They are stained in different solutions.
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Eventually, the pathologist looks at the sections
Under a microscope.
This is what you will do now!
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B B’. Human liver; surgical specimen(the patient underwent a liver transplantation)
one liver is studied with 2 different stains!
H.E. & Prussian blue : B’
B’: The iron stains in blue after a chemical reaction done on the tissue section
(this is a histochemical technique like many other « special stains » used by pathologists to characterize substances like iron, mucins, … in tissue sections).
C. Human liver, trucut biopsy;H. E. stain.
Information on the tissue sections
B
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Pathologists work with different types of samples :– biopsies
• non invasive (no surgery)• surgical
– Autopsies
Your sections A B C :
How were they obtained?
. A: biopsy? Surgery? Autopsy?
. B: biopsy? Surgery? Autopsy?
.C: biopsy? Surgery? Autopsy?
A
answer
B C
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• Different types of samples :– biopsies
• non invasive (no surgery) 1• surgical 2
– Autopsies 3
Your sections A B C : How were they obtained?
.A : 1: non invasive biopsy
. B: 2 or 3: surgery or autopsy
. C: 1: non invasive biopsy
A B C
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Hepatocytes are arranged in sheets separated by vascular spaces (sinusoids).
To day we focus on the morphology of hepatocytes, in the normal and diseased liver.
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Slides 53-57 : histology of the liver
2
1
3
1 HEPATOCYTES
2 CENTRAL VEIN3 PORTAL space
with 3 elements : artery, vein, and biliary duct.
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Hepatocytes
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Hépatocytes
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Your section 1A
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A. Human liver biopsy
The H.E. stain: Hemalun Eosin
nuclei violet
cytoplasm pink
the routine stain in tissue pathology
A
Information on the tissue sections that ou are going to observe
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Your turn …
Examine sections A, B et B’, C
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Section A: observe and insert images of hepatocytes:
What color is normal liver at gross examination?
Which gross specimen?
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Section B: observe and insert images of hepatocytes:
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Section B’: observe and insert images of hepatocytes:
What color is normal liver at gross examination?
Which gross specimen?
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What color is normal liver at gross examination?
Which gross specimen?
Section C: observe and insert images of hepatocytes:
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Now, you can:
-either : go to slides 63 and 64
-or: go first to next step (step 3 : slides 66 to 70)
As you prefer
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Mr Peter S.
Gross: which liver?
Micro: which liver?
56-year-old, a real estate agent, shares his time between his job, his motor boat, and his friends. His big belly contrasts with thin arms and legs. He reports an important beer intake.
2 or 3 ou 4 ?
BB1 or C ?
Associate!
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Mr Paul H.
Gross: which liver?
Micro: which liver?
48-year-old, bank employee, has a tan grey complexion. Recently, he felt tired and had vague abdominal pains. He lost a little weight, but feels as if his belly was enlarged. His doctor discovers diabetes.
2 or 3 ou 4 ?
BB’ or C ?
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You have observed gross and microsocpic lesions associated with two diseases in two patients.
What is the pathogenesis of these diseases ?
Their causes, mechanisms?
That is what you will define during step 3
Using the Robbins textbook.
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Etiology Mechanisms Morphologyof Lesions Clinic
Macroscopy
microscopy
Step 3Let’s recapitulate ?
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(Robbins index: hemochromatosis )
Etiology MechanismsMorphology
of lesionsClinic
One example of disease: hemochromatosis
gross:Micro:
? ?
Use the Robbins to fill the boxes
?
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Robbins index : « steatosis » « fatty change » « fatty liver »
Etiology MechanismsMorphology Clinic
Another lesion: steatosis
gross:Micro:
? ? ? ?
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a quiz
Step 4 :
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A B
These microscopic images illustrate liver overload.
Picture B is a ……………….. Stain.
The brown (in A) and blue (in B) deposit is …………..
This is :
- an inherited disease?
- an acquired disease?
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Which substance accumulates in the cytoplasm of these hepatocytes ?
- cholesterol - triglycerides
Liver steatosis
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In the two diseases that you have studied, the liver is enlarged (size and weight are increased).Is this :– Hyperplasia ?– Hypertrophy ?
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Besides the liver, in which organs or tissues can these lesions be observed :
• An iron overload:• -…..• -…..• -…..
• fatty changes• -……
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• Define pathology• Observe a gross specimen• Explain how a tissue section is obtained• Compare a normal and diseased
tissue• Find information in Robbins relative to
the observed lesions.
The End for today! you now know how to
Robbins 6è Edition pages 1-2
7è Edition page 4
Pathos maladie Logos : étude
Etiologie
cause
Mécanismes Morphologie des lésions Clinique
L’étude des maladies comprend ces 4 aspects:
Robbins pages .. (index: hemochromatosis )
Etiologie MécanismesMorphologie des Lésions
Clinique
Un exemple de maladie : l’hémochromatose
Macro:Micro:
? ? ? ?
Remplir les cases à l’aide du ROBBINS?
Prenez le À la fin!
Robbins• Les pages Contents (Xiii et XiV après la préface)
vous indiquent que le livre comporte deux parties:
. La pathologie générale : p xiii
. La pathologie par organes : p xiv-XV