When it is idiopathic it is called cryptogenic (COP). These diseases typically present as multifocal consolidations, but sometimes they may become diffuse. Other examples are organizing pneumonia (OP) and chronic eosinophilic pneumonia. Now it is obvious that some diseases can have more than one pattern.ДЇor instance a lobar pneumonia caused by streptococcus pneumoniae may become diffuse if the patient does not respond to the treatment.

Multiple - usually multiple ill-defined densities.

Diffuse - perihilar (batwing) or peripheral (reversed batwing).

The table summarizes the most common diseases, that present with consolidation.ДЄ way to think of the differential diagnosis is to think of the possible content of the alveoli:ДЄnother way to think of consolidation, is to look at the pattern of distribution:

Fleischner Society recommendations for follow-up of nodules.

In this article we will focus on this four-pattern approach.ДЄt the end we will also discuss diseases that present as areas of decreased density. Lung abnormalities with an increased density - also called opacities - are the most common.ДЄ practical approach is to divide these into four patterns: On a chest x-ray lung abnormalities will either present as areas of increased density or as areas of decreased density.

TI-RADS - Thyroid Imaging Reporting and Data System.

Esophagus II: Strictures, Acute syndromes, Neoplasms and Vascular impressions.

Esophagus I: anatomy, rings, inflammation.

Vascular Anomalies of Aorta, Pulmonary and Systemic vessels.

Contrast-enhanced MRA of peripheral vessels.

Ischemic and non-ischemic cardiomyopathy.

Coronary Artery Disease-Reporting and Data System.

Bi-RADS for Mammography and Ultrasound 2013.

Transvaginal Ultrasound for Non-Gynaecological Conditions.

Acute Abdomen in Gynaecology - Ultrasound.Appendicitis - Pitfalls in US and CT diagnosis.

Cavity obliteration definition