Rhabdomyosarcoma, from the CureRays guide library.

Rhabdomyosarcoma is a soft-tissue cancer that most often affects children and is treated with a combination of chemotherapy, radiation, and sometimes surgery — an approach that cures the majority of patients.

What it is.

Rhabdomyosarcoma is a type of soft-tissue sarcoma that arises from cells which would normally develop into skeletal muscle — the muscles we move on purpose. Although it can develop almost anywhere in the body, it most commonly appears in the head and neck (including around the eye and in the sinuses), the urinary and reproductive organs (such as the bladder, prostate, or vagina), and the arms and legs. Rhabdomyosarcoma is primarily a cancer of children and teenagers, though it can occur in adults. Because it can grow in so many locations, the symptoms depend on where it starts — a visible or felt lump, a bulging eye, nasal congestion or bleeding, blood in the urine or trouble urinating, or pain. Rhabdomyosarcoma is treated as a whole-body disease from the start, meaning chemotherapy is always part of the plan to treat both the visible tumor and any microscopic spread, while radiation and sometimes surgery are used to control the original tumor. With this combined, coordinated approach delivered by a specialized pediatric or sarcoma team, the majority of children with rhabdomyosarcoma are cured. Treatment is carefully tailored to balance cure with protecting growth and long-term function, especially in young patients.

How radiation treats it.

Radiation uses focused high-energy beams to damage the DNA inside cancer cells so they can no longer grow and divide. In rhabdomyosarcoma, radiation is a key way to control the original tumor — the place it started — particularly when surgery cannot remove it completely or would damage important structures such as the eye, bladder, or facial growth. Because rhabdomyosarcoma is treated as a whole-body disease, radiation is combined with chemotherapy, which treats microscopic spread and helps shrink the tumor first. Treatment is given as a series of short daily sessions over several weeks, carefully timed around chemotherapy. In children, sparing healthy growing tissue is a top priority, so advanced techniques are used: IMRT shapes the dose around the tumor, proton therapy reduces dose to developing bones and organs, and brachytherapy can deliver a focused dose for certain pelvic tumors while preserving function. The radiation oncologist chooses the technique and dose based on the tumor's size, location, and how well it responded to chemotherapy. Side effects depend on the area treated and are watched closely and managed by the team, with special attention to protecting growth, vision, fertility, and organ function in young patients. The overall plan is designed to cure the cancer while protecting a child's long-term development and quality of life.

The ways we can treat it.

Intensity-modulated radiation therapy (IMRT). IMRT shapes the radiation dose tightly around the tumor while sparing nearby developing tissues, which is especially important in children to protect growth, vision, and organ function.

Proton therapy. Proton beams stop after reaching the tumor, delivering little dose beyond it; in children this can reduce radiation to growing bones, the brain, and other organs, potentially lowering long-term side effects and the risk of second cancers.

Brachytherapy. For selected tumors in sites such as the bladder, prostate, or vagina, placing radioactive sources directly at the tumor delivers a focused dose while sparing surrounding organs and preserving function.

Radiation timed with chemotherapy. Radiation is carefully scheduled around chemotherapy cycles so the two treatments work together to control the tumor while keeping side effects manageable.

Questions we hear often.

Will my child need chemotherapy even if the tumor is removed? Yes. Rhabdomyosarcoma is treated as a whole-body disease, so chemotherapy is given to every patient — even after surgery — to treat any microscopic cancer cells that may have spread. Radiation is often added to control the area where the tumor started.

Is radiation safe for a child? Radiation is used carefully in children, with advanced techniques such as IMRT, proton therapy, and sometimes brachytherapy chosen specifically to spare growing tissue and protect vision, organ function, and development. The team weighs the benefits of curing the cancer against long-term effects and selects the gentlest effective approach.

What are the chances of cure? Most children with rhabdomyosarcoma are cured, especially those in the low- and intermediate-risk groups. The outlook depends on where the tumor started, its size and subtype, whether it has spread, and how it responds to chemotherapy. Your child's team can give a prognosis tailored to their specific situation.

This guide is informational only. It is not medical advice — please confirm anything here with your care team.