Answer: Branchial fistula
Step-by-step explanation:
The condition described in the case is called a branchial fistula.
A branchial fistula is a congenital anomaly that occurs during embryonic development. It is characterized by the presence of an abnormal connection or opening between the surface of the neck and the pharynx. In this case, the opening is located on the side of the neck directly anterior to the sternocleidomastoid muscle.
The recurrent infections and mucus discharge on the surface of the neck are common symptoms of a branchial fistula. These openings can allow bacteria or other microorganisms to enter, leading to recurrent infections. The mucus discharge may be a result of the abnormal connection between the pharynx and the surface of the neck.
To address this condition, an endoscopic surgery is recommended. During the surgery, the opening of the branchial fistula would be closed using laser cauterization. This procedure aims to permanently close the abnormal connection and prevent further infections or complications.