What are the image findings in IPF?

Interstitial infiltrates, Predilection for base and peripheral regions, all lung fields affected in later stages and lung volumes decrease In HRCT: patchy basilar, peripheral and subpleural, honey comb (cystic radiolucencies - cardinal of UIP, absent in AIP and DIP), reticular opacities, ragged pleural surfaces, traction bronchiactasis, occasional ground glass opacities (not feature of UIP) When HRCT are typical for UIP, we may not need a biopsy