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Teratoma

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 germ layers: ectoderm, mesoderm, and endoderm. They can be benign or malignant. more...

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Teratomata often contain well-differentiated cells which can result in tissues growing in a teratoma which are quite different from the surrounding tissue—ovarian teratomata 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.

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.

Some teratomata secrete thyroxine, in some cases to such a degree that it can lead to clinical hyperthyroidism in the patient.

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.

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Nasopharyngeal teratoma in an adult.(RHINOSCOPIC CLINIC) : An article from: Ear, Nose and Throat Journal $5.95 Human Teratomas: Experimental and Clinical Biology (Contemporary Biomedicine) $19.99
Teratoma : An article from: Ear, Nose & Throat Journal $20.00

Teratoma
Teratomas are neoplasms made up of tissues foreign to the site of occurrence. They contain tissue from all three embryonic germ layers (endoderm, mesoderm, ...
Nasopharyngeal teratoma in an adult
A 32-year-old Chinese woman presented to the ENT clinic with a nonhealing ulcer in the oral cavity that had been present for 3 months. Examination revealed ...
Congenital intracranial immature teratoma of the lateral ventricle: a case report and review of the literature
Objective: Congenital intracranial tumors are very rare and only account for 0.5-1.5% of all childhood brain tumors. The most common type of these tumors ...
Mature teratoma of the nasal vestibule: A case report
Abstract Teratomas are rare congenital neoplasms that arise from pluripotent cells. They consist of tissue from all three embryonic germ layers. According ...
Multilocular Thymic Cyst Associated With Mature Mediastinal Teratoma: A Report of 2 Cases
Acquired thymic cysts are multilocular and show florid xanthomatous and myofibroblastic inflammation. They usually occur in association with mediastinal ...
Angiosarcoma masquerading as embryonal carcinoma in the metastasis from a mature testicular teratoma
Sarcoma can arise within a germ cell tumor (GCT) from a malignant transformation of teratomatous elements or as late sequelae to radiation therapy. Angiosarcoma as a malignant component in testicul
Primary carcinoid tumor arising in a mature teratoma of the kidney: A case report and review of the literature
Primary carcinoid tumor, especially that arising in a mature teratoma of the kidney, is extremely rare; only 3 cases have been reported in the world ...
100% mortality when tumor, hydrops present - Sacrococcygeal Teratoma
NEW ORLEANS -- The presence of hydrops is a poor prognostic sign in fetuses diagnosed antenatally with sacrococcygeal teratoma. A retrospective evaluation ...

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