Abstract Patient: Female, 17-year-old Final Diagnosis: Drug toxicity Symptoms: Seizure Medication: — Clinical Procedure: — Specialty: Neurology Objective: Unusual clinical course Background: The electroencephalographic (EEG) findings associated with tetrahydrocannabinol (THC) use, particularly in concentrated form, are not well-described, despite the current widespread availability of these products. There is a lack of prior research describing the EEG findings in adolescent cannabis users, and the effects of THC on the seizure threshold have been variably reported. Case Report: A 17-year-old girl with no prior history of seizures or known seizure risk factors presented to an Emergency Department with acutely abnormal behavior in the setting of daily...