Cryptogenic organising pneumonia Is characterised by all of the following except
Migratory pulmonary opacities
Obstructive pattern of pulmonary function
Aerial hypoxemia
Good response to coicosteroids
In cryptogenic organizing pneumonia,pulmonary function is impaired with a restrictive defect and aerial hypoxaemia,being most common.Chest X ray shows bilateral,patchy/diffuse,recurrent & migratory pulmonary opacities.These changes are more frequent in the periphery of the lung and in the lower lung zone.Glucocoicoid therapy induces clinical recovery in two-thirds of patients. Reference:Harrison's medicine-18th edition,page no:2166,2167.
Respiratory system