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[Differential diagnosis of malignant neck tumors. Aneurysm of the common carotid artery].

A large atraumatic aneurysm of the common carotid artery is reported that was initially believed clinically to be a malignant tumor of the thyroid. Surgical removal and patch plasty were successful. Subtotal thrombosis of an aneurysm with lack of pulsation may make the diagnosis difficult. In any patient with a rapidly increasing mass in the neck, an aneurysm should be considered in the differential diagnosis.