Acute Leg Ischaemia in a Child due to a Thrombosed Popliteal Aneurysm.

Introduction: The case of an idiopathic thrombosed popliteal aneurysm is described in an otherwise healthy 6 year old child. This is the fourth reported case and the second youngest patient to present with an idiopathic isolated popliteal aneurysm.

Report: A 6 year old boy presented with an acutely ischaemic right foot. Computed tomography angiography confirmed a thrombosed popliteal aneurysm. A femoropopliteal bypass was performed with reversed long saphenous vein and ligation of the aneurysm. Yearly follow up is ongoing with ultrasound surveillance; the child's growth and development is unaffected, and the graft is patent. There was a readmission over six years later with claudication on the right side. There was evidence of thrombus in the graft with associated distal embolisation, which was managed conservatively with anticoagulation.

Discussion: Given the rarity of such presentations in the paediatric population, there is minimal good quality data to guide treatment. There have been three previous cases of idiopathic popliteal aneurysms all managed with a reversed long saphenous vein femoropopliteal bypass with resection of the aneurysm. Management should be guided based on the clinical picture and should be undertaken in specialised tertiary centres if possible. Surgical intervention is the treatment of choice in patients with an ischaemic limb.