"dissociation: on (b)(6) 2017: for zone 2 tever, the relay plus graft was deployed.(b)(6) 2018: the patient complained of chest pain.Catheter inspection was performed, but no anomalies were found.On (b)(6) 2018: in follow-up ct scanning, dissociation was found on the wall of brachiocephalic artery neighborhood lesser curvature side anterior of the ascending aorta.On (b)(6) 2018: the bare part of the graft was cut out and ascending arch replacement surgery was performed.The bare part stuck into the intima of the artery and the part torn.On (b)(6) 2018: the patient is still in hospital.The patient is currently recovering but still observed.".
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