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    Teratoma from wikipedia, the free encyclopedia jump to: navigation, search     teratoma classification and external resources micrograph of a teratoma showing tissue from all three germ layers: mesoderm (immature cartilage - left-upper corner of image), endoderm (gastrointestinal glands - center-bottom of image) and ectoderm (epidermis - right of image). H&e stain. Icd-10 c62. 9 (ilds c62. 930) icd-o: 9080 diseasesdb 3604 12952 12966 emedicine med/3449 mesh d013724 a teratoma is an encapsulated tumor with tissue or organ components resembling normal derivatives of all three germ layers. The tissues of a teratoma, although normal in themselves, may be quite different from surrounding tissues and may be highly disparate; teratomas have been reported to contain hair, teeth, bone and, very rarely, more complex organs such as eyes, [1] [2] torso, [3] [4] and hands, feet, or other limbs. [5] usually, however, a teratoma will contain no organs but rather one or more tissues normally found in organs such as the brain, thyroid, liver, and lung. Sometimes, the teratoma has within its capsule one or more fluid-filled cysts; when a large cyst occurs, there is a potential for the teratoma to produce a structure within the cyst that resembles a fetus. next day delivery viagra Because they are encapsulated, teratomas are usually benign, although several forms of malignant teratoma are known and some of these are common forms of teratoma. A mature teratoma is typically benign and found more commonly in women, while an immature teratoma is typically malignant and is more often found in men. next day delivery viagra Teratomas are thought to be present at birth (congenital), but small ones are often not discovered until much later in life. Definitive medical diagnosis of a teratoma is based on its histology; this diagnosis is made by a pathologist. Contents 1 etymology 2 pathophysiology 2. cheap viagra overnight 1 hypotheses of origin 2. 2 mature teratoma 2. 3 dermoid cyst 2. 4 fetus in fetu and fetiform teratoma 2. 5 struma ovarii 3 classification 3. 1 malignant transformation 3. 2 extraspinal ependymoma 4 diagnosis 5 time of presentation 6 complications 7 treatment 7. 1 surgery 7. 2 chemotherapy 7. buy female viagra 3 follow-up 8 epidemiology 9 research 10 in other animals 11 other links 12 references 13 external links [edit] etymology there are some differences in terminology in the u. S. buy cheap generic viagra online And u. K. The words "teratoma" (u. S. Terminology) and "mature teratoma" (u. K. Terminology) both may be used to refer to a benign growth, while the word "teratoma" (u. next day delivery viagra K. Terminology) may refer to "immature teratoma", a cancerous growth. It is therefore important to specify whether one is using u. S. Or u. K. Terminology. The term "malignant teratoma" has sometimes been used as a synonym for nonseminomatous germ cell tumor. [6] [edit] pathophysiology main article: germ cell tumor teratomas belong to a class of tumors known as nonseminomatous germ cell tumor (n. S. G. C. T. ). All tumors of this class are the result of abnormal development of pluripotent cells: germ cells and embryonal cells. Teratomas of embryonic origin are congenital; teratomas of germ cell origin may or may not be congenital (this is not known). cheap viagra pills online The kind of pluripotent cell appears to be unimportant, apart from constraining the location of the teratoma in the body. Teratomas derived from germ cells occur in the testes in men and ovaries in women. Teratomas derived from embryonic cells usually occur on the subject's midline: in the brain, elsewhere in the skull, in the nose, in the tongue, under the tongue, and in the neck (cervical teratoma), mediastinum, retroperitoneum, and attached to the coccyx. However, teratomas may also occur elsewhere: very rarely in solid organs (most notably the heart and liver) and hollow organs (such as the stomach and bladder), and more commonly on the skull sutures. buy viagra without prescription [edit] hypotheses of origin concerning the origin of teratomas, there exist numerous hypotheses. [7] these hypotheses are not to be confused with the unrelated hypothesis that fetus in fetu (see below) is not a teratoma at all but rather a parasitic twin. buy generic viagra online overnight [edit] mature teratoma mature teratoma of the mediastinum. A horizontal slice of the resected tumor reveals fibrofatty tissue, calcified areas, and a few cystic spaces lined with smooth membrane and containing a hair. In the left lower corner, the involved b5 bronchus is evident. A mature teratoma is a grade 0 teratoma. Mature teratomas are highly variable in form and histology, and may be solid, cystic, or a combination of solid and cystic. A mature teratoma often contains several different types of tissue such as skin, muscle, and bone. Skin may surround a cyst and grow abundant hair (see dermoid cyst). buying online viagra Mature teratomas generally are benign; malignant mature teratomas are of several distinct types. [edit] dermoid cyst a small (4 cm) dermoid cyst of an ovary, discovered during a c-section a dermoid cyst is a mature cystic teratoma containing hair (sometimes very abundant) and other structures characteristic of normal skin and other tissues derived from the ectoderm. next day delivery viagra The term is most often applied to teratoma on the skull sutures and in the ovaries of females. [edit] fetus in fetu and fetiform teratoma fetus in fetu and fetiform teratoma are rare forms of mature teratoma that include one or more components resembling a malformed fetus. Both forms may contain or appear to contain complete organ systems, even major body parts such as torso or limbs. Fetus in fetu differs from fetiform teratom.

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