Common symptoms included cough in 23 patients, fatigue in 20 patients, fever in 16 patients, and shortness of breath in 8 patients. Computed tomography scans of the chest and a test called bronchoalveolar lavage were helpful in making the diagnosis in these patients. Bronchoalveolar lavage involves inserting a special instrument down the throat and into the lungs to obtain samples for examination. All patients required discontinuation of sirolimus therapy before they improved, and all recovered completely within 6 months of withdrawal of the drug.