A branchioma is a benign (non-cancerous) tumor that develops from remnants of the branchial apparatus, which are structures that form in the embryo during fetal development and give rise to parts of the head and neck. Branchiomas are also known as branchial cleft cysts or branchial apparatus remnants.

Branchioma typically occurs in the neck region and can cause a variety of symptoms, such as a painless lump, difficulty swallowing, or breathing problems if the tumor is large enough to compress the airway. Treatment usually involves surgical removal of the tumor.