mosaic pattern

Mosaic Patternitie

By

Gamal Rabie Agmy , MD , FCCP Professor of Chest Diseases ,Assiut University

Mosiac pattern

Where is the pathology ???????

in the areas with increased density meaning there is ground glass

in the areas with decreased density meaning there is air trapping

Pathology in black areas

Airtrapping: Airway

Disease

Bronchiolitis obliterans (constrictive bronchiolitis) idiopathic, connective tissue diseases, drug reaction,

after transplantation, after infection

Hypersensitivity pneumonitis granulomatous inflammation of bronchiolar wall

Sarcoidosis granulomatous inflammation of bronchiolar wall

Asthma / Bronchiectasis / Airway diseases

Airway Disease

what you see……

In inspiration sharply demarcated areas of seemingly increased

density (normal) and decreased density

demarcation by interlobular septa

In expiration ‘black’ areas remain in volume and density

‘white’ areas decrease in volume and increase in

density

INCREASE IN CONTRAST

DIFFERENCES

AIRTRAPPING

Bronchiolitis

obliterans

Early Sarcoidosis

Chronic EAA

Hypersensitivity pneumonitis

Extr. Allerg. Alveolitis (EAA) HRCT

Morphology

chronic: fibrosis

Intra- / interlobular septal thickening

Irregular interfaces

Traction bronchiectasis

acute - subacute

acinar (centrilobular) unsharp densities

ground glass (patchy - diffuse)

Pathology in white Areas

Alveolitis / Pneumonitis

Ground glass desquamative intertitial pneumoinia (DIP)

nonspecific interstitial pneumonia (NSIP)

organizing pneumonia

In expiration both areas (white and black) decrease in

volume and increase in density

DECREASE IN CONTRAST

DIFFERENCES

DI

P

Cellular

NSIP

Mosaic Perfusion

Chronic pulmonary embolism

LOOK FOR

Pulmonary hypertension

idiopathic, cardiac disease, pulmonary

disease

CTEPH =

Chronic thrombembolic

pulmonary hypertension