DANDELION SIGN AND ATOLL SIGN IN 3RD WAVE COVID19 PATIENT (REPORTED TODAY )

DANDELION SIGN AND ATOLL SIGN IN COVID 19 PATIENT 

DANDELION SIGN --Focal GGO with central linear density due to vascular prominence 

 ATOLL SIGN --Focal lucency surrounded by more dense consolidation 

HRCT LUNG

 

Ref--High -resolution CT of Lung (Webb)

HRCT LUNGS --BASIC

 

All are true regarding HRCT of lungs except

a.the bronchus and homologous pulmonary artery are of similar diameter in normal subjects

b.B/A ratio refers to internal diameter( luminal ) of bronchus (B) divided by diameter of adjacent pulmonary artery(A)

c.B/A ratio in normal subjects averages .45 to .60

d.B/A ratio >1 is generally regarded as abnormal

e.B/A ratio >1 in normal subjects has been associated with increasing age

ANS --- c

B/A ratio in normal subjects averages .65 to .70