Rhabdomyosarcoma

Rhabdomyosarcoma

-ICDO|8920|3
OMIM =
MedlinePlus = 001429
eMedicineSubj = ent
eMedicineTopic = 641
eMedicine_mult = eMedicine2|ped|2005
MeshID = D012208

A rhabdomyosarcoma is a type of cancer, specifically a sarcoma (cancer of connective tissues), in which the cancer cells are thought to arise from skeletal muscle progenitors. It can also be found attached to muscle tissue, wrapped around intestines, or anywhere, to exclude the neck area.

Presentation

Its two most common forms are embryonal rhabdomyosarcoma and alveolar rhabdomyosarcoma. In the former, which is more common in younger children, the cancer cells resemble those of a typical 6-to-8-week embryo. In the latter, which is more common in older children and teenagers, they resemble those of a typical 10-to-12-week embryo.

Epidemiology

Rhabdomyosarcoma is a relatively rare form of cancer.

It is most common in children ages one to five, and is also found in teens aged 15 to 19, although this is more rare. This cancer is also an adult cancer but it is rare.

St. Jude Children's Research Hospital reports that rhabdomyosarcoma is the most common soft tissue sarcoma in children. Soft tissue sarcomas make up 7 - 8% of childhood cancers.

Diagnosis

When rhabdomyosarcoma is suspected, tests will be run for blood, muscle, and marrow.

Diagnosis of rhabdomyosarcoma depends on recognition of differentiation toward skeletal muscle cells. The protein "myo D1" is a protein normally found in developing skeletal muscle cells which disappears after the muscle matures and becomes innervated by a nerve. Thus, myo D1 is not found in normal skeletal muscle and serves as a useful immunohistochemical marker of rhabdomyosarcoma.Early manifestation can be misdiagnosed as a pseudotumor that is non responsive to steroid treatment.

Treatment

Treatment for rhabdomyosarcoma consists of chemotherapy, radiation therapy and sometimes surgery. Surgery to remove the tumor is often difficult or impossible because the tumor is usually embedded deep within the tissue, leaving it difficult to reach. If a tumor presents itself in the extremities, amputation is often necessary to improve chances of survival.

If there is no evidence of metastasis, surgery combined with chemotherapy and radiation offer the best prognosis. Patients whose tumors have metastasized usually have a poor chance for long-term survival. In patients who began treatment before metastasis, the prognosis is better, although the disease is generally incurable because the tumors that cannot be surgically removed tend to spread.

St Jude's Children's Research Hospital reports that more than 70% of children diagnosed with localized rhabdomyosarcoma have long-term survival.

Tungsten Alloy and RMS

Studies have shown a link between Tungsten alloy and RMS. [http://www.afrri.usuhs.mil/www/outreach/pdf/tungsten_cancer.pdf]

ee also

*Rhabdomyoma
*Sarcoma botryoides

References

External links

* humpath [http://www.humpath.com/spip.php?page=article&id_article=1956 #1956] (Pathology images)
* [http://www.acor.org/ped-onc/diseases/rhabdo.html Ped-Onc Resource Center]
* [http://www.liddyshriversarcomainitiative.org/Newsletters/V01N04/RMS/rms.htm
* [http://www.stjude.org/stjude/v/index.jsp?vgnextoid=64fb061585f70110VgnVCM1000001e0215acRCRD&vgnextchannel=bc4fbfe82e118010VgnVCM1000000e2015acRCRD&SearchUrl=search_results.jsp&QueryText=rhabdomyosarcoma}Rhabdomyosarcoma by Leonard Wexler, MD]
* [http://www.cancer.org/docroot/CRI/content/CRI_2_4_1X_What_is_rhabdomyosarcoma_53.asp?sitearea=]
* [http://www.healthsystem.virginia.edu/uvahealth/peds_oncology/rhabdo.cfm]
* [http://www.stjude.org/stjude/v/index.jsp?vgnextoid=64fb061585f70110VgnVCM1000001e0215acRCRD&vgnextchannel=bc4fbfe82e118010VgnVCM1000000e2015acRCRD&SearchUrl=search_results.jsp&QueryText=rhabdomyosarcoma]


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Look at other dictionaries:

  • Rhabdomyosarcoma — A malignant tumor that starts in muscle. Rhabdomyosarcoma is primarily a childhood tumor and occurs most often in children under 5 years of age. Over 60% of cases show up before age 10. On rare occasions, rhabdomyosarcoma affects adults.… …   Medical dictionary

  • rhabdomyosarcoma — noun a highly malignant neoplasm derived from striated muscle • Syn: ↑rhabdosarcoma • Hypernyms: ↑sarcoma • Hyponyms: ↑embryonal rhabdomyosarcoma, ↑embryonal rhabdosarcoma, ↑alveolar rhabdomyosarcoma, ↑ …   Useful english dictionary

  • rhabdomyosarcoma — noun A cancerous tumor of skeletal muscle. Rhabdomyosarcoma, the most common primary malignant orbital tumor of childhood, has been classified histologically as embryonal, differentiated, or alveolar. Syn: rabdomyo sarcoma …   Wiktionary

  • rhabdomyosarcoma — n. a rare malignant tumour, usually of childhood, originating in, or showing the characteristics of, striated muscle. Pleomorphic rhabdomyosarcoma occurs in late middle age, in the muscles of the limbs. Embryonal rhabdomyosarcomas, affecting… …   The new mediacal dictionary

  • rhabdomyosarcoma — Cancer that forms in the soft tissues in a type of muscle called striated muscle. Rhabdomyosarcoma can occur anywhere in the body …   English dictionary of cancer terms

  • rhabdomyosarcoma — noun Etymology: New Latin, from rhabdo + my + sarcoma Date: 1898 a malignant tumor composed of striated muscle fibers …   New Collegiate Dictionary

  • rhabdomyosarcoma — Malignant tumour (sarcoma) derived from striated muscle …   Dictionary of molecular biology

  • rhabdomyosarcoma — /rab doh muy oh sahr koh meuh/, n., pl. rhabdomyosarcomas, rhabdomyosarcomata / meuh teuh/. Pathol. a malignant tumor made up of striated muscle tissue. [1895 1900; RHABDO + MYO + SARCOMA] * * * …   Universalium

  • rhabdomyosarcoma — rhab·do·myosarcoma …   English syllables

  • rhabdomyosarcoma — rhab•do•my•o•sar•co•ma [[t]ˌræb doʊˌmaɪ oʊ sɑrˈkoʊ mə[/t]] n. pl. mas, ma•ta [[t] mə tə[/t]] pat a malignant tumor made up of striated muscle tissue • Etymology: 1895–1900 …   From formal English to slang

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