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Right Internal Jugular Vein Phlebectasia: A Rare Cause of Neck Swelling. Internal jugular vein (IJV) phlebectasia is a rare condition presenting as a self-reducible soft tissue swelling of the neck due to fusiform dilation of the venous wall. We report the case of a 7-year-old boy who presented with painless soft mass in the side of the neck which appears during coughing and straining and reduces spontaneously. Diagnosis was confirmed by Doppler ultrasonography and magnetic resonance imaging of the neck. Conservative management and regular follow-up were considered. In this case report, we highlight this rare benign condition as an uncommon differential of neck swellings in order to avoid unnecessary diagnostic workup and interventions.