Why would oncologists choose not to use any radiation when treating alveolar rhabdomyosarcoma, primary site left leg, amputation ned in amputated leg.

Ask the oncologist: Or get second opinion. These are infrequent tumors most are staged and treated by studied evidence based effective protocols and clinical trials.

No radiation: Generally we use radiation with alveolar rhabdomyosarcoma; however, in the setting where the primary site was amputated there is nothing left to radiate.

Locally controlled: Radiation is used for local control. If wide negative margins were achieved with the amputation, there is no need to do more local therapy: local tissue no long exists. Much of this decision has to be based on the case's specifics.