Surgery Most frequent site of branchial cyst is at: A Upper third of posterior border of sternocleidomastoid B Lower third of anterior border of sternocleidomastoid C Upper third of anteromedial border of sternocleidomastoid D Supraclavicular fossa 💡 Explanation Most frequent site of branchial cyst is at: ✓ Correct Answer: C. Upper third of anteromedial border of sternocleidomastoid