Stress fracture

Histiocytosis

Osteogenesis imperfecta

Acromegaly

Os odontoideum

Soto's

Conradi Hunerman

Sarcoidosis

Spondyloepiphyseal dysplasia

Hurler's syndrome

Hemivertebra

Osteopetrosis

Medullary infarcts

Morquio's syndrome

Ochronosis

Melorheostosis

Adamantinoma

Leprosy with squamous cell carcinoma

Hemophilia

Epiphyseal dysplasia with scrotal hernia

Thanatophoric dwarfism

Thalassemia

Dissecting aneurysm

Arch of Aorta aneurysm

Alveolar proteinosis

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

Achalasia cardia

Achalasia cardia

Inlet to Outlet Shadow

Inhomogeneous cardiac density: Right half more dense than left 

Density crossing midline (right black arrow) 

Right sided inlet to outlet shadow 

Right para spinal line (left black arrow) 

Barium swallow below: Dilated esophagus 

This is a case of achalasia cardi

Round pneumonia

Pneumonectomy

Diffuse haziness 

Smaller right hemithorax 

Mediastinal shift to right 

Surgical clips 

Dextrocardia

Stomach bubble on left 

Right diaphragm lower 

Position of heart determines which diaphragm is lower, not liver. 

Left lower collapse + pneumo

Pneumomediastinum  

Air around left pulmonary artery 

Air around right pulmonary artery  

Additional findings include:

Left lower lobe atelectasis 

Triangular retrocardiac density