Cysts are abnormal, closed sac-like structures within a tissue that contain a liquid, gaseous, or semisolid substance. Cysts can occur anywhere in the body and can vary in size. The outer, or capsular, portion of a cyst is termed the cyst wall.

Abnormal sacs containing gas, fluid, or a semisolid material, with a membranous lining.

Small sacs that form in the body that contain gas, fluids, or partly solid material. Cysts are not normal; the body does not need them to function.

Any fluid-filled closed cavity or sac that is lined by an Epithelium. Cysts can be of normal, abnormal, non-neoplastic, or neoplastic Tissues.

Fibrous Blood-filled Cyst in the bone. Although benign it can be destructive causing Deformity and fractures.

A Tumor derived from branchial Epithelium or branchial Rests. (Dorland, 27th ed)

A fluid-filled closed cavity or sac that is lined by an Epithelium and found in the Breast. It may appear as a single large Cyst in one Breast, multifocal, or bilateral in Fibrocystic Breast Disease.

A usually spherical Cyst, arising as an embryonic out-pouching of the foregut or Trachea. It is generally found in the mediastinum or Lung and is usually asymptomatic unless it becomes infected.

A mixed radiolucent-radiopaque lesion of the Jaws with features of both a Cyst and a solid Neoplasm. It is characterized microscopically by an epithelial lining showing a palisaded layer of columnar b [..]

Congenital or acquired Cysts of the Brain, spinal cord, or Meninges which may remain stable in size or undergo progressive enlargement.

Benign, congenital, neuroepithelial Cysts that are typically filled with a viscous Mucus. They usually arise in the anterior portion of the Third Ventricle between the fornices.

Characterized by the fusiform or saccular Dilatation of the Common Bile Duct.

A congenital anatomic malformation of a Bile Duct, including cystic Dilatation of the Extrahepatic Bile Duct or the large Intrahepatic Bile Duct. Classification is based on the site and type of Dilata [..]

Most common follicular Odontogenic Cyst. Occurs in relation to a partially erupted or Unerupted Tooth with at least the Crown of the Tooth to which the Cyst is attached protruding into the Cystic cavi [..]

A Tumor consisting of displaced ectodermal structures along the lines of embryonic fusion, the wall being formed of Epithelium-lined Connective Tissue, including Skin appendages, and containing Kerati [..]

A cystic dilation of the Epididymis, usually in the head portion (caput Epididymis). The Cyst Fluid contains dead Spermatozoa and can be easily differentiated from Testicular Hydrocele and other testi [..]

Any fluid-filled closed cavity or sac (Cysts) that is lined by an Epithelium and found in the Esophagus region.

Cyst due to the occlusion of the duct of a follicle or small gland.

Liver Disease caused by Infections with parasitic Tapeworms of the genus Echinococcus, such as Echinococcus granulosus or Echinococcus multilocularis. Ingested Echinococcus ova burrow into the Intesti [..]

An Infection caused by the infestation of the larval form of Tapeworms of the genus Echinococcus. The liver, Lungs, and Kidney are the most common areas of infestation.

Characterized by the presence of a singular or multiple intrahepatic Cysts.

Saccular lesions lined with Epithelium and contained within pathologically formed cavities in the jaw; also nonepithelial Cysts (pseudoCysts) as they apply to the jaw, e.g., traumatic or Solitary Cyst [..]

Intracranial or spinal cavities containing a cerebrospinal-like fluid, the wall of which is composed of Arachnoidal Cells. They are most often developmental or related to Trauma. Intracranial Arachnoi [..]

Cystic mass containing Lymph from diseased Lymphatic channels or following surgical Trauma or other injury.

Cysts of one of the parts of the mediastinum: the superior part, containing the Trachea, Esophagus, Thoracic Duct and Thymus organs; the inferior middle part, containing the Pericardium; the inferior [..]

A rare intra-abdominal Tumor in the Mesentery. Mesenteric Cysts are usually benign and can be very large fluid-filled (2000 mL) lesions.

Characterized by the presence of multiple extrahepatic and intrahepatic Cysts.

A disorder characterized by multiple, wide spread cutaneous Cysts that often become inflamed and Rupture. It is caused by the same Mutations in the Gene coding for KRT-17 that are causative Mutations [..]

Nodular Tumor-like lesions or mucoid flesh, arising from Tendon sheaths, Ligaments, or Joint Capsule, especially of the hands, Wrists, or Feet. They are not true Cysts as they lack epithelial wall. Th [..]

Cysts formed from epithelial inclusions in the lines of fusion of the embryonic processes which form the Jaws. They include nasopalatine or incisive canal Cyst, incisive papilla Cyst, globulomaxillary [..]

Cysts found in the Jaws and arising from Epithelium involved in Tooth formation. They include Follicular Cysts (e.g., primordial Cyst, Dentigerous Cyst, multilocular Cyst), lateral Periodontal Cysts, [..]

General term for Cysts and cystic Diseases of the Ovary.

A true Cyst of the Pancreas, distinguished from the much more common Pancreatic Pseudocyst by possessing a lining of mucous Epithelium. Pancreatic Cysts are categorized as congenital, Retention, neopl [..]

A Cyst (Cysts) near the Ovary, derived from anomalies of the Fallopian Tubes or the Broad Ligament. The paramesonephric type consists of ciliated Cells similar to the Oviduct Epithelium. The mesonephr [..]

An Epithelium-lined sac containing fluid; usually found at the apex of a pulp-involved Tooth. The lateral type occurs less frequently along the side of the root.

A Hair-containing Cyst or sinus, occurring chiefly in the coccygeal region.

A Synovial Cyst located in the back of the knee, in the popliteal space arising from the semimembranous bursa or the knee joint.

Helminth Infection of the Lung caused by Echinococcus granulosus or Echinococcus multilocularis.

Slow-growing fluid-filled epithelial sac at the apex of a Tooth with a nonvital pulp or defective root canal filling.

Intradermal or subcutaneous saclike structure, the wall of which is stratified Epithelium containing keratohyalin granules.

Non-neoplastic Tumor-like lesions at joints, developed from the Synovial Membrane of a joint through the Joint Capsule into the periarticular Tissues. They are filled with Synovial Fluid with a smooth [..]

Perineurial Cysts commonly found in the SACRAL REGION. They arise from the PERINEURIUM Membrane within the Spinal Nerve Roots. The distinctive feature of the Cysts is the presence of Spinal Nerve Root [..]

A Cyst in the neck caused by persistence of portions of, or by lack of closure of, the primitive thyroglossal duct. (Dorland, 27th ed)

Cyst occurring in a persistent portion of the Urachus, presenting as an extraperitoneal mass in the umbilical region. It is characterized by Abdominal Pain, and Fever if infected. It may Rupture, lead [..]

Any fluid-filled closed cavity or sac that is lined by an EPITHELIUM. Cysts can be of normal, abnormal, non-neoplastic, or neoplastic tissues.

blocked sebaceous glands on the skin's surface.

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