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Penetrating carotid injuries occur infrequently in the UK. Without surgical intervention, mortality rates are close to 100%. Whilst vessel repair is the optimal surgical choice, zone III neck injuries or haemodynamic instability in particular often require vessel ligation, which carries higher mortality rates, increased risk of stroke and poorer outcomes overall. We present a young patient who sustained a gunshot wound to the neck. Emergency exploration revealed a penetrating injury to zone III of the left side of the neck and a complete transection of the left internal carotid artery. Due to haemodynamic instability, damage control surgery was mandated, and the internal carotid artery was ligated. The patient was admitted to ITU but had a severe acute neurological deterioration post-operation. CT head imaging revealed a large left frontal-parietal infarct with rightward midline shift, in keeping with malignant MCA syndrome. He underwent an emergency decompressive craniectomy, with resolution of the midline shift seen on subsequent imaging. At 3 months, the patient walked independently out of hospital, with a reduction in his modified Rankin Scale score from 5 to 2 following intensive therapies input. Whilst rare, the importance of timely recognition and intervention of an infrequent complication of carotid ligation is paramount. Decompressive craniectomy is the mainstay of treatment for malignant MCA syndrome, yet outcomes remain poor in all ages, highlighting the patient’s noteworthy recovery. Though emerging evidence suggests novel endovascular repair techniques may provide favourable outcomes and reduced complications in carotid injuries, open surgery remains the treatment of choice.

675 ICA Ligation and Malignant MCA Syndrome Secondary to A Gunshot Wound: A Case Presentation