the differential diagnosis of cystlike swelling in the floor of the mouth should include sialolithiasis , mucous retention phenomenon ( mucocele , ranula ) , dermoid and epidermal inclusion cyst , thyroglossal duct cyst , branchial cleft cyst , hemangioma , lymphangioma , cystic hygroma , lipoma , and occasionally pleomorphic adenoma .
C0024221
lymphangioma
C0206620
cystic hygroma