A long-wave T1 T2 signal with dots in the bone marrow is a high signal in the bone marrow on MRI, which usually suggests a bone marrow lesion and can be caused by a variety of reasons, commonly including osteomyelitis, bone marrow aging, and myeloma. A long-wave T1 T2 signal is a high signal in the bone marrow on MRI, which is usually indicative of a bone marrow lesion. MRI is more accurate in diagnosing bone marrow disorders. 1. Osteomyelitis: If trauma or bacterial infection causes osteomyelitis, the stimulation of inflammation may produce abnormal pathological changes, which may appear as multiple punctate abnormal signals in the bone marrow with long wave T1 T2 on MRI. 2. Bone marrow aging, the volume of fat cells in the bone marrow cavity increases, the number of fat cells increases greatly, especially in the bone marrow of the limbs, most of the bone marrow cavity is occupied by fat cells, the bone marrow may appear punctate signal long wave T1 T2. 3. Myeloma: If there is a tumor in the bone marrow, or if there is a bone marrow metastasis from a tumor in other parts of the body, multiple punctate abnormal T1 T2 signals in the bone may appear when MRI is performed. Punctate signal long wave T1 T2 in bone marrow can also be seen in other causes, which need to be combined with accompanying symptoms and other laboratory imaging tests to make a clear diagnosis, and it is recommended that the patient go to the hospital in time to avoid delaying the condition.