The authors presented a clinical case of left subclavian steal syndrome in a 62-year-old man. The main complaints were dizziness, tinnitus, memory loss and unsteady gait. The patient had severe concomitant pathology: coronary heart disease, hypertension, heart failure. X-ray endovascular technologies (balloon dilatation and stenting) made it possible to completely restore blood flow in the affected segment. After treatment, the above complaints disappeared. Minimally invasive X-ray endovascular techniques have particular benefits in patients with severe comorbid pathology.