Adverse drug reactions are appreciably harmful or unpleasant reactions resulting from an intervention related to the use of medical products, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product. Given medical case reports extracted from MEDLINE, the task is to classify whether the case report mentions the presence of any adverse drug reaction. Classify your answers into non-adverse drug event and adverse drug event.

CASE: A 71-year-old man without immunodeficiency developed corneal endotheliitis in the right eye.
non-adverse drug event
The case report does not provide any information about whether the man was taking any medication at the time of developing corneal endotheliitis. Since no adverse drug reaction is mentioned in this case report, we can classify it as "non-adverse drug event"..