We present the case of a female patient who previously underwent cardiac surgery for traumatic anterior right atrial perforation after a stabbing attack. Four years later the patient presented with right atrial common type flutter and isthmus ablation was performed subsequently. However, three years after isthmus ablation the patient was readmitted with atypical right atrial flutter. Electrophysiological study revealed persistent bidirectional isthmus block. Three-dimensional mapping (NavX, St. Jude Medical, St. Paul, MN, USA) demonstrated an incisional tachycardia with the critical isthmus at the border of the anterior area of scar in a close proximity to the superior tricuspid annulus. After ablation of this isthmus the patient was arrhythmia free after a follow-up of 9 months. This case illustrates that three-dimensional scar mapping may help to identify unusual isthmus sites that may be simultaneously responsible for both typical and atypical atrial flutter.