 If you completed at least 12 and no more than 24 cycles of treatment with lenalidomide, you will have follow-up visits every 3 months. If you complete 24 or more cycles of treatment with lenalidomide, you will have follow-up visits every 6 months. This will continue until the disease gets worse. At each visit, blood about 1 teaspoon will be drawn to test your thyroid function. The status of your disease will be evaluated and you may have a bone marrow biopsy and aspirate. You will have a chest x-ray and CT scans of the chest, abdomen, and pelvis. If needed, you will also have a CT scan of the neck. If needed, you will have a colonoscopy or endoscopy. You may also have a bone marrow biopsy and aspirate performed. 