Mucocele

         The mucous extravasation cyst is the most common be benign lesion of the salivary glands, generally conceded to be traumatic origin, is a lesion involving salivary gland and their ducts. This lesion is characterized by pooling of mucous in a cavity within the connective tissue, due to the rupture of salivary duct or in or acini It is not a true cyst since it lack an epithelial lining.

 Also known as:- 
  Mucus extravasation phenomenon

  Mucus retention phenomenon

Aetiology:-

Biting the lips or cheek or pinching the lip by extraction forceps.

Clinic Features:-

    •  History of trauma (lip biting/pinching of lip)

    •  Most frequently occure on lower lip.

    •  Size in millimetres or few centimetres.

    •  Dome shaped mucosal swelling. 

    •  Seen in children and young adults.

    •  Spilled Mucin below the mucusal surface often imparts bluish translucent Swelling; deeper                  mucocele may be normal in colour.

    •  Recurrent swelling seem in lamina propria.

    •  Not A True Cyst. (lake of lining epithelium.)

    •  Other sites:- Floor of mouth, anterior ventral surface of tongue, buccal mucosa, palate,                         retromolar pad.

Histologic features:-

  • Cavity it self not lined up by linning epithelium so it is not a true       cyst.

  • Cricumscribed cavity in connective tissue 

   And submucosa producing elevation of mucosa with thinning of       epithelium.

  • wall made up of compressed fibrous connective tissue &                   Fibroblasts

  • Shows infiltration of inflammatory cells.

  • The flatter epithelium linning has been refrered as "feeder duct".

• The salivary gland, acini which lies adjacent to the mucocele shows alterations in their ducts.

Treatment:-

• Excision of mucocele

• If the lesion is simply incised, then it's contents are evacuated and, but it will rapidly filled when incision heals.

• There is occasional recurrence after excision. (Less likely to occur)



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