Swelling of Submandibular Region

Abstract

A man in his 30s with no significant medical history presented with a subtle soft swelling of his right submandibular region for the past 8 months. In the previous 24 hours it had rapidly expanded with painful neck swelling, dysphagia, andmild shortness of breath with supine and intermittent fever. Physical examination revealed a soft and easily compressible neck mass with overlying skin erythemawith no obvious involvement of the floor of themouth. Flexible fiberoptic laryngoscopy revealed no suspicious lesions and symmetric vocal cord movement. Contrast-enhanced computed tomographic (CT) imaging of the neck revealed a 6-cm wellcircumscribed mass with septations within the right sublingual space herniating through the mylohyoid muscle into the right submandibular space as shown in the Figure (A and B, axial; C, sagittal reformatted; and D, coronal reformatted). The patient was taken to the operating room for transcervical excision of the lesion. What is your diagnosis? A B