Most patients are cigarette smokers.
HRCT Changes in DIP HRCT at the lung bases shows patchy ground-glass density bilaterally. The reticular pattern represents thickened interlobular and intralobular septa, the latter probably representing bronchiolovascular structures. Note the absence of honeycombing. Contrast this CT with that of UIP . Middle and lower lung zones were involved in all patients and the upper lung zone in 18.