I have been diagnosed with MGUS for 8 to 10 years now, male age 77. Recently had a scare when my hematologist ordered a full body bone scan because my kappa (I think) light chains keep going up. The process involved 31 x-rays of my bones, not fun. He said they would look for bone lesions and if they were found it would likely indicate a progression from MGUS to multiple myeloma. Just got the results this morning and hooray, no sign of lytic bone lesions! What a relief!