AA	air alveoli
AC	Acini formation
Ad	Tunica adventitia
AG	Adenoma
BC	Blood capillary
Br	bronchiole
BV	Blood vessel (s)
CA	Collapsed air alveoli
CB	Congested blood vessel
CC	and blood capillaries
CF	Collagen fibers
Ch	Chondroclasts
CT	Connective tissue (s)
DA	Dilated air alveoli
Da	Degenerated air alveoli
DB	Dilated bronchiole
Dc	Deciliation in the RE
DE	Degeneration
Df	Deformation in the HC
DH	Diffuse hemorrhage
Di	Increase the diameter HC
DHC	Degenerated hyaline cartilage
Ds	Desquamation
DT	Degenerated thyroid follicles
DV	Dilated blood vessel
EC	Enlarged hyaline cartilage
FD	Fatty degeneration
Em	Emphysema
Epi	Epithelialization
F	Fibrocytes
FC	Foam cells
FE	Flattened epithelium
Fi	Fibroid degeneration
HA	Hypertrophied artery
HC	Hyaline cartilage
HD	Hydropic degeneration
HM	Hypertrophy of tunica media
Hp	Hyperplasia
IA	Inter-alveolar septum
If	Inflammatory cells infiltrations
LA	lung adenoma
LH	Lymphoid hyperplasia
LP	Lamina propria
Lu	Tracheal lumen
M	Monocytic infiltration
MF	Mitotic figure
Mp	Metaplasia
Mu	Mucosal layer
MUl	Mucosal ulceration
Ne	Necrosis
Nc	Necrotic epithelial cells
Oe	Edema
P	Plasma cells
Pa	Perialveolar region
Pb	Peribronchiolar region
PC	Protrusion in HC
Pe	Perichondrium
PF	Polyp’s formation
PeT	Perichondrial thickening
Pv	Perivascular region
RE	Respiratory epithelium
SA	Septal destruction of air alveoli
SD	Septal destruction of air alveoli
SE	Severe emphysema
St	Steatosis
TA	Tracheal adenoma
Ta	Tunica adventitia
Th	Thickening
TI	Tunica intima
TM	Tunica media