Commonest site of branchial cyst is
Branchial cysts are characteristically found anterior and deep to the upper third of the sternocleidomastoid muscle. Branchial fistulas(those derived from 2nd branchial cleft) open externally in the lower third of necic, near the anterior border of sternocleidomastoid. Its internal orifice is located in the tonsillar fossa. Branchial cysts & fistulas are remnants of the branchial apparatus present in fetal life. branchial cysts, fistulas or sinuses are lined by squamous epithelium. Ref : Bailey & Love 25/e p727
Upper one third of SCM
Lower one third of SCM
Upper two third of the SCM
Lower two third of the SCM
Head and neck