1. Acute Inflammation

2. Serofibrinous peritonitis
neutrophils
fibrin
Liver
Fibrin

3. Acute diffuse suppurative appendicitis
Ulcerated
mucosa
Low power
Swollen appendix
intact
mucosa
Purulent exudate
neutrophils
Lymph
follicle
High power
Ulcerated
mucosa
Ulcerated mucosa
glands
neutrophils

4. Lobar pneumonia
Consolidated lobe

5. Lobar pneumonia pleura High power Low power fibrin Exudate in alveoli
Interalveolar septae
neutrophils

6. Chronic Inflammation & Repair

7. Chronic Inflammation
Lymphocytes
Blood vessels
Plasma cells

8. Granulation Tissue capillaries Low power High power Capillary
fibroblast

9. Myocardial scar
scar
myocardium
scar
Left ventricle
scar
myocardium

10. Intra & Extracellular deposits

11. Hyalinosis, Spleen Hyaline change In central arteriole Lymph
Follicle(white
Pulp)

12. Amyloidosis Kidney High power Low power Amyloid in glomeruli
Amyloid in afferent arterioles

13. Amyloidosis , liver Amyloid material (pale pink) Liver cell cords

14. Fatty change , Liver(Steatosis)
High power
Low power
Central vein
Fat vacuole in liver cell
vacuolated liver cells

15. Fatty change, liver(Steatosis)
rounded border
High power
Vacuolated hepatocyte
(signet ring appearance)
Yellow cut section
Portal tract

16. Brown atrophy ,heart
Lipofuscin pigment

17. Disorders of Blood Flow

18. Chronic venous congestion, lung
Low power
High power
anthracosis
Heart failure
cells
Thickened interalveolar
septae

19. Chronic venous congestion,liver
Central vein
Central vein
Low power
Central sinusoidal congestion and necrosis

20. Chronic venous congestion,liver
High power
Notice the similarity of the cut section of the liver to the cut section of the nutmeg (left)
Congested central sinusoids
Dark areas are congested sinusoids
giving the cut section of liver a
nutmeg appearance
central vein

21. Recent Thrombus vessel thrombus Low power High power thrombus
Vessel wall
*In the picture on the right the blood vessel is opened longitudinally. The thrombus appears as red jelly- like material adherent to the intima.
*The lines of Zahn represents the aplatelets, They appear purple in color.
Lines of Zahn
fibrin

22. Infarction, Spleen Recent infarctions Zone of hyperemia
Coagulative necrosis
(infarction)
Splenic tissue
Zone of acute inflammation

23. Infarction,Lung Infarction Lung showing chronic venous congestion
Low Power
High Power
Hemorrhagic infarction