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Spontaneous ruptured aneurysm involving an aberrant subclavian artery with a right-sided aortic arch and Kommerell’s diverticulumis a rare life-threatening condition that can be treated successfully if promptly identified. Multidetector Computed Tomography angiography is the first line imaging modality of thoracic vascular anomalies diagnosis. We report the case of a 74-year-old man suffering from this emergency ondition with mediastinal hematoma mostly extending to the left-side extrapleural cavity. The patient underwent successful emergency thoracic endovascular aortic repair and an Amplatzer vascular plug was placed into the first segment of the ALSA. Post-procedural imaging showed complete exclusion of the aneurysm. Emergency endovascular repair can be effective in such cases.