FACTOID # 19: Cheap sloppy joes: Looking for reduced-price lunches for schoolchildren? Head for Oklahoma!
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Struma ovarii

A teratoma is a type of tumor that derives from pluripotent germ cells. The word comes from a Greek term meaning roughly "monster tumor". Teratomas (more correctly teratomata) usually start from cells in the testes in men, the ovaries in women and in the sacrum in children. Teratomata involve cells from all three embryonic cell layers: ectoderm, mesoderm and endoderm. They can be benign or malignant. See the article about cancer for the main article about malignant tumors. ... In cell biology, a pluripotent cell is one able to differentiate into many cell types. ... Gametes (in Greek: γαμέτες) —also known as sex cells, germ cells, or spores—are the specialized cells that come together during fertilization (conception) in organisms that reproduce sexually. ... Human male anatomy The testicles, known medically as testes (singular testis), are the male generative glands in animals. ... Human female internal reproductive anatomy Ovaries are a part of a female organism that produces eggs. ... Sacrum, pelvic surface The sacrum (os sacrum) is a large, triangular bone at the base of the vertebral column and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. ... The ectoderm is outermost of the three germ layers of the developing embryo, the other two being the mesoderm and the endoderm. ... Mesoderm is one of the three germ layers in the early developing embryo, the other two layers being the ectoderm and the endoderm. ... The endoderm is one of the three germ layers of the developing embryo, the other two being the ectoderm and the mesoderm. ...


Teratomata often contain well-differentiated cells which can result in tissues growing in a teratoma which are quite different to the surrounding tissue—ovarian teratomas have been known to grow hair and teeth. Such a benign cystic teratoma is often termed a dermoid cyst, nowadays more correctly termed a mature teratoma. Some teratomata may contain a mixture of well-differentiated, mature tissues as: respiratory epithelium, hair follicle, fat tissue or mature nervous tissue. Immature teratomata of the ovary have a malignant potential in line with the amount of neuroblastic tissue present. Hair is the filamentous outgrowth of the epidermis found in mammals. ... Types of teeth Molars are used for grinding up foods Carnassials are used for slicing food. ... A dermoid cyst, or benign cystic teratoma, also mature cystic teratoma, is a nonmalignant tumor containing a cyst lined by epidermal cells. ...


Testicular teratomata are generally less well-differentiated, and have a worse prognosis (chances of recovery are not as high).


Some teratomata secrete the "pregnancy hormone" human chorionic gonadotropin (HCG), which can be used in clinical practice to follow-up successful treatment or relapse in patients with a known HCG-secreting teratoma. It is not recommended as a diagnostic marker. Human chorionic gonadotropin (hCG) is a peptide hormone produced in pregnancy, that is made by the embryo soon after conception and later by the trophoblast (part of the placenta). ...


Some teratomata secrete thyroxine, in some cases to such a degree that it can lead to clinical hyperthyroidism in the patient. The thyroid hormones, thyroxine (T4) and triiodothyronine (T3), are tyrosine-based hormones produced by the thyroid gland. ... Hyperthyroidism (thyrotoxicosis or fast thyroid gland) is the clinical syndrome caused by an excess of circulating free thyroxine (T4) and free triiodothyronine (T3), or both. ...


Struma ovarii

Struma ovarii (literally: goiter of the ovary) is a rare specialized type of teratoma present in the ovary that contains benign thyroid tissue. To be classified as a struma ovarii, thyroid tissue must be the predominant histology. Malignant transformation of struma ovarii is rare, occurring in only 5% of cases. Human female internal reproductive anatomy Ovaries are a part of a female organism that produces eggs. ...


External Links

  • A site with pictures of teratoma sections. (http://www.pathologyatlas.ro/Teratoma.html)
  • Wired News: Tetratoma and Stem Cell Research (http://www.wired.com/wired/archive/13.06/stemcells.html?tw=wn_tophead_6)

  Results from FactBites:
 
Thyrotoxicosis from Cancer (1487 words)
Struma ovarii is a rare tumor occurring in a teratoma or dermoid in the ovary.
It is not advised to treat patients with thyrotoxic struma ovarii with radioiodide because of the possibility that the tumor is malignant, which cannot be determined on clinical grounds, and secondly because of the unknown radiation effects on the other elements of the teratoma.
Struma ovarii, in itself a rare tumor occurring in a teratoma or dermoid in the ovarium, rarely causes hyperthyroidism.
Teratoma - Wikipedia, the free encyclopedia (445 words)
Struma ovarii (literally: goiter of the ovary) is a rare specialized type of teratoma present in the ovary that contains benign thyroid tissue.
To be classified as a struma ovarii, thyroid tissue must be the predominant histology.
Malignant transformation of struma ovarii is rare, occurring in only 5% of cases.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m