Difference between True and Pseudo Cyst

Cyst: It is a pathological cavity containing fluid, semi-fluid or gas, which is usually lined by epithelium and is not formed by the accumulation of pus.

True Cyst: A fluid-filled cavity which is lined by epithelium. A cyst can appear in any type of body tissue and it varies in size from as small as a few centimeters to many inches which can displace organs. There are many types of cysts which can occur in any part of the body. Most of the cysts which are found in the body are Benign of not harmful, but some types of cysts are harmful and are Benign.

Ex:

  • Nasolabial duct cyst
  • Odontogenic cyst
  • Mucous cyst of the oral mucosa
  • Median Palatal Cyst
  • Glandular odontogenic cyst
  • Dentigerous cyst
  • Calcifying odontogenic cyst
  • Periapical cyst
  • Paradental cyst
  • Radicular cyst
  • Globulomaxillary Cyst

Pseudo Cyst: A fluid-filled cavity which is not lined by epithelium. They are similar to True Cysts but lack the Epithelial or Endothelial cells. It appears as a cyst in Scans and other diagnostic procedures. Pseudocysts are usually Asymptomatic when they re small but they start showing symptoms when the cysts increase in size. The common symptoms which are seen later are – nausea, vomiting, loss of appetite, diarrhea, fever, 

Ex:

  • Stafne’s cyst
  • Aneurysmal bone cyst
  • Hemorrhagic bone cyst / Traumatic bone cyst
  • Mucocele-Extravasation cyst

Diagnosis of a Pseudocyst is done usually by a CT Scan and along with it additional diagnostic tests like Blood tests, X-rays etc. The causes of Cysts are many and some of the major causes of Cyst formation are Genetic conditions, Tumors, Infections, Injuries, chronic inflammatory conditions, parasites etc. 

Treatment of a True Cyst or Pseudo Cyst is usually to initially drain the cyst and in most cases is to completely excise or remove the cyst by procedures like – Excision, Marsupialisation etc. 

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