The number and location of tumors developing in the body determines a diagnosis of stage 1 non-Hodgkin lymphoma. This diagnosis process is called staging and involves tests of one or more of the following: a bone marrow biopsy, CT scan, MRI, ultrasound, spinal tap, or PET scan. Stage 1 indicates a smaller number of tumors than any of the other stages. It can also be classified as "indolent" in medical terms-meaning the disease is very responsive to treatment and those diagnosed with it can expect to survive many years-or aggressive, requiring intensive treatment.
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