Sirolimus-induced interstitial lung disease and resolution after conversion to everolimus.

Mammalian target of rapamycin inhibitors (mTORi) are used to treat a variety of malignancies and have an established role in organ transplantation. Interstitial lung disease (ILD) is one of the complications of mTORi and is believed to be a class effect. More cases of ILD have been reported with sirolimus than with everolimus in the literature, possibly due to earlier introduction and wider use of sirolimus. We report the case of a kidney transplant recipient who developed ILD secondary to sirolimus and improved rapidly after switching to everolimus.