Rhabdomyosarcoma is a fast-growing cancer that can develop in soft tissues (such as muscle) almost anywhere in the body.
Rhabdomyosarcomas can develop anywhere, but the head and neck, genital or urinary tract, and limbs are the most common locations.
Symptoms depend on where rhabdomyosarcomas develop.
Diagnosis involves imaging tests and a biopsy.
Treatment consists of chemotherapy, surgery, and sometimes radiation therapy.
(See also Overview of Childhood Cancer.)
About 400 to 500 cases of rhabdomyosarcoma occur in children in the United States each year. This cancer accounts for 3% of all cancers in children. Two thirds of cases of this cancer are diagnosed in children younger than 7 years of age. Rhabdomyosarcomas occur mostly in children.
This cancer develops from cells that would normally develop into muscle cells. The cause of rhabdomyosarcoma is unknown.
Although rhabdomyosarcoma can occur almost anywhere, it tends to occur most often in the following:
Head and neck (in about 35% of cases): Most common among school-aged children
Genital or urinary tract (in about 25% of cases), usually in the bladder, prostate, or vagina: Typically occurring in infants and toddlers
Limbs (in about 20% of cases): Most common among adolescents
Trunk or other miscellaneous sites (in about 20% of cases)
Rhabdomyosarcoma can spread (metastasize) to other parts of the body. But it is usually diagnosed before the cancer has spread. About 15 to 25% of children are diagnosed after the cancer has spread. In these children, the cancer is most commonly located in the lungs. Bones, bone marrow, and the lymph nodes are other locations to which the cancer may spread.
Symptoms of Rhabdomyosarcoma
In most children, the first symptom of the cancer is a firm lump or problems related to an organ affected by the cancer, such as the following:
Eyes: Tearing, eye pain, or a bulging eye
Nose and throat: Nasal congestion, a change in the voice, or a nasal discharge that contains mucus and pus
Genital or urinary tract: Abdominal pain, a lump in the abdomen that can be felt, difficulty urinating, and blood in the urine
Vagina: Discharge that contains mucus and blood or a polyp-like mass that sticks out of the vagina
Limbs: Firm lumps on the arms or legs
Limb cancers frequently spread, especially to the lungs, bone marrow, and lymph nodes. Usually, this spread does not cause symptoms.
Diagnosis of Rhabdomyosarcoma
Computed tomography (CT) or magnetic resonance imaging (MRI)
Biopsy or removal of tumor
If a lump is detected, CT or MRI is done.
The diagnosis of rhabdomyosarcoma is confirmed by taking a sample from the lump and examining it under a microscope (biopsy). Sometimes the entire lump is removed surgically.
To determine whether the cancer has spread, CT of the chest, a bone scan (radionuclide scanning of bones), and another type of radionuclide scanning called positron emission tomography–CT (PET-CT) are done, and a sample of bone marrow is removed from both hip bones and examined.
Treatment of Rhabdomyosarcoma
Chemotherapy and surgery
Sometimes radiation therapy
(See also Cancer Treatment Principles.)
Treatment consists of chemotherapy and surgery, radiation therapy, or a combination of all three treatments.
When surgery is done, the entire cancer is removed if possible.
Radiation therapy is typically used if some cancer remains after surgery or if the cancer is considered intermediate risk or high risk.
Prognosis for Rhabdomyosarcoma
The prognosis is based on several factors:
Where the cancer is located
How much of the cancer can be removed
Whether it has spread
How old the child is
What the cancer cells and tissue look like when examined under a microscope
The prognosis is worse for children who are under 1 year of age or who are over 10 years of age.
Children are considered low risk, intermediate risk, or high risk depending on their combination of factors. More than 90% of children who are considered low risk survive, but less than 50% of children who are considered high risk survive.
More Information
The following English-language resource may be useful. Please note that THE MANUAL is not responsible for the content of this resource.
American Cancer Society: If Your Child Is Diagnosed With Cancer: A resource for parents and loved ones of a child who has cancer that provides information about how to cope with some of the problems and questions that come up just after a child is diagnosed
