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Background: In childhood and adolescence, cardiac arrhythmias are often benign in the absence of congenital heart defects. Nevertheless, life-threatening inherited arrhythmogenic syndromes can become clinically manifest in early childhood. As early symptoms may be similar in both conditions, thorough workup is fundamental to avoid delayed diagnosis and misdiagnosis., Case Summary: We present the case of a 26-year-old Caucasian female patient who presented with recurrent non-sustained polymorphic wide complex tachycardia. Structural heart disease was excluded by echocardiography as well as cardiac magnetic resonance imaging. Due to wide complex extrasystoles and couplets with alternating QRS axis occurring at low levels of physical exertion, catecholaminergic polymorphic ventricular tachycardia (CPVT) was suspected and further investigated. Epinephrine testing in combination with an electrophysiological (EP) study with placement of a coronary sinus catheter and subsequent programmed stimulation ruled out CPVT and unmasked wide complex tachycardia as varying aberrant conduction of focal atrial tachycardia (FAT). 3D-navigated mapping of FAT revealed a direct parahisian origin. Due to significantly increased risk of atrio-ventricular (AV) block during ablation, the patient refused ablation and preferred medical antiarrhythmic therapy., Discussion: Given the consequences of both, delayed diagnosis and misdiagnosis of CPVT, thorough workup is fundamental. In case of doubt regarding potential aberrant AV conduction in the context of wide complex tachycardia, an invasive EP study may easily and safely prove or rule out aberrancy., Competing Interests: Conflict of interest: None declared., (© The Author(s) 2023. Published by Oxford University Press on behalf of the European Society of Cardiology.)