The target sign has been described to be a result of perivascular inflammation and organizing pneumonia. Whether there is also an element of infarction is uncertain. As seen in...

The vascular “tree-in-bud” appearance has been recently described by Brijesh Patel from the Royal Brompton in London and his colleagues. This refers to the presence of...

One major difference between Covid-19 and other inflammatory / infective diseases of the lungs is the presence of a vasculopathy / angiopathy. While there is still debate about...

Ground glass (GG) foci are the commonest manifestation of Covid-19 and in subtle cases, may be difficult to diagnose. This difficulty may then turn a positive into a negative...

None of the findings individually seen in patients with Covid-19 pneumonia are pathognomonic, except for some of the signs of angiopathy / vasculopathy that will be shown in...

Many patients show thin or thick curvilinear bands (purple arrows) usually in the lower lobes in the posterior and lateral basal segments. It is not clear what they represent....

Reticular opacities present as thin short lines that are usually peripheral and subpleural. When the reticular lesions are predominant, resembling an NSIP pattern (blue arrow),...

Unlike ground glass attenuation, which is increased attenuation that does not obscure the underlying vessels, consolidation obscures the underlying vessels and usually shows air...

Ground glass (GG) is the commonest sign. This can be subpleural or bronchocentric, with or without prominent vessels (green arrow), with reticular opacities / septal thickening...

In the earlier days of reading CT scans for suspect Covid-19 cases, an image such as this would have been called suspicious for but not definitive for Covid-19 (CO-RADS 3/4) or...