Unilateral mydriasis due to scopolamine patch.

Case: We report the case of a patient who presented with unilateral mydriasis after a scopolamine patch application. The specific clinical context (cancer) reported here may have led to the misinterpretation of the etiology of mydriasis.

Conclusion: Our case description warns against diagnostic mistakes related to this side effect and highlights the advantages of pilocarpine test in the differential diagnosis of unilateral mydriasis.