Novel coronavirus pneumonia on CT, early can have small patchy shadow, ground glass shadow, and may even be multiple ground glass shadow, mainly present in the outer lung field, to the middle stage of pneumonia severe, the ground glass shadow or sheet shadow will expand in scope, will become a large ground glass shadow, and even appear large white lung, due to the inflammatory storm led to the lung is full of exudative state, loss of respiratory function evolved into severe disease, can be observed on CT, in 1 -The progression of lung lesions greater than 50% within 2 days is considered to be in acute progression and requires high attention to prevent the patient from progressing to critical illness and losing the opportunity for treatment. Content source: Dr. You Lai