Alveolar proteinosis

Acinar Nodules
Difficult to distinguish from interstitial nodules
Varying in size
Indistinct edges
Company they keep (other alveolar densities)

Round pneumonia

Pneumonectomy

Diffuse haziness 

Smaller right hemithorax 

Mediastinal shift to right 

Surgical clips 

Alveolar proteinosis

Bilateral diffuse alveolar disease 

Butterfly pattern 

Medullary distribution 

Air bronchograms 

Consolidations - find the lobe.

Pneumomediastinum

Cavitating mets

Right lower lobe collapse

Right middle lobe collapse

Right upper lobe collapse

Left upper lobe collapse

Left lower lobe collapse

Post pneumonectomy

Pneumatocoele

Asbestosis

Pulmonary edema

Alveolar oedema manifests as ill-defined nodular opacities tending to confluence (see image with arrows). Interstitial oedema can be seen as peripheral septal lines - Kerley B lines (arrowheads). 

Grade	Description	PCWP (mmHg)
0	Normal	8 - 12
1	upper zone diversion	13 - 18
2	interstitial oedema	19 - 25
3	alveolar oedema	>25

Hydatid - water lily

CLE

Congenital cystic adenomatoid malformation

3types:
1)type1- single/multiple cysts2-10 cms in diameter(ciliated respiratory epithelium)
2)type2-multiple cysts <2 cms in diameter(cuboidal to columnar epithelium)
3)type3-essentially solid lesions with microcysts and gland like (adenomatoid)structure

Radiographic findings-

Variable appearance ,depending on the size of cysts

Solid to multicystic mass with variable amounts of air and fluid

May cause mass effect

On ct-

Used for characterization of lesion for pre surgical planning

To identify lesions diagnosed prenatally but not evident on chest x-ray

Cyst walls and solid components demonstrate variable enhancement

mass effect demonstrated as mediastinal shift or adjacent lung compression

Will demonstrate cystic spaces even in solid appearing masses on chest radiograph

No evidence of systemic arterial blood supply

Pulmonary AVM