[Dynamics of permeability of the blood-brain barrier after FUS thalamotomy according to contrast-enhanced MRI].

Objective: To study the dynamics of permeability of the blood-brain barrier (BBB) after focused ultrasound (FUS) thalamotomy in patients with tremor of different origin through visualization phenomena, assessment of the tendency of contrast accumulation level change at MRI in coagulation necrosis focus over different time intervals.

Material and methods: The study included 10 patients (8 - with Parkinson's disease, 2 - with essential tremor). MRI of the brain was performed before the procedure, MRI of the brain with contrast enhancement («Gadobutrol») was carried out after 2 and 24 hours, 1, 3, 6 and 12 months from FUS thalamotomy. The volume and nature of contrast accumulation in the impact area were evaluated.

Results: Observations show that the performance of FUS thalamotomy leads to a temporary impairment of the BBB permeability. This is confirmed by the data of dynamic accumulation of contrast substance in MRI in the area of coagulation necrosis.

Conclusion: The analysis of the dynamic changes of volume and patterns of accumulation of contrast substance in MRI in the area of coagulation necrosis after FUS thalamotomy was performed during the study. The obtained data demonstrate almost complete absence of contrast enhancement 24 hours after intervention, that may indicate a partial restoration of the structural-functional integrity of BBB after its transient disruption in the early postoperative period.