Mucous extravasaton cyst and Mucous retention cyst

Mucous extravasation cyst(Mucoceles)

· Affect the minor salivary glands,particularly of the lip

· Often form in lower lip,sometimes in floor of the mouth(Ranula)

· They are obviously cystic,hemispherical,fluctuant and bluish.

· Saliva leaking from the damagedducts into the superficial surrounding tissues excitesand inflammatory reaction

· The pools of saliva gradually coalese to form a rounded collection of fluid surrounded by compressed connective tissue without epithelium

Mucous retention cyst

· Mucocele cannot be distinguished from a retention cyst clinically.

· Remnants of the minor mucous salivary glands are visible together with their dilated ducts,the epithelium of which is the epithelial lining of the cyst.