The best replacement for infiltrate is atelectasis.

The best alternatives to infiltrate are rated as following:
★★★★★  atelectasis
★★★★  effusion
★★★  consolidation
★★★  pneumonia
★★  pleural effusion
★  edema
★  effusion lungs
  corneal ulcer
  pulmonary edema

Your alternative for infiltrate is not listed? Suggest!
Speaking about infiltrate, one probably shouldn't forget about pleural effusion.

Other search terms related to infiltrate and their ratings are:
★★★★★ pleural effusion
★★ atelectasis
You have in mind a companion for infiltrate and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of infiltrate in all years. Click on graph for more.
infiltrate
atelectasis
effusion