CYSTS BY DR.SYED ALAM ZEB, SURG B KTH DEFINITION CLASSIFICATION
Pathological fluid filled sac bounded by a wall.
Sac is lined by cells of epithelial origin. Examples are thyroglossal cyst, Sebaceous cyst, Branchial cysts.
They are walled-off fluid collections not lined by epithelium. Examples are: Dental or radicular cysts, encysted pleural effusions, pancreatic pseudocysts.
CLASSIFICATION OF CYSTS
CONGENITAL: 1. Persistence of normal vestigial remnants like Thyroglossal, Branchial, urachal & hydatid of morgagni.
2. Ectopia of various tissues like dermoid, epidermoid & enterogenous.
3. Failure of connection of tubular elements like polycystic kidneys .
4.Hamartomas like cystic hygromas .
Acquired Cysts : 1. Retention like mucous cyst of mouth . 2. Implantation like Epidermoid. 3. Parasitic like Hydatid. 4. Hyperplasic like mammary dysplasia. 5. Degenerative like uterine leiomyoma 6. Traumatic e.g. Haematogenous. 7. Neoplastic e.g. Cyst adenoma, cystic teratoma.
Depends on the type of cyst, site and size.
Pain: due to increase in size, haemorrhage, infection, rupture or torsion.
Pressure effect : Haemorrhage in Thyroglossal cyst causes dyspnoea. Pseudocyst of pancreas may compress the CBD, or stomach.
Special features like a punctum on sebaceous cyst, typical location of Thyroglossal cyst.
Mostly found in the liver but can reach to any organ in the body.