The results of MRT in 41 patients with bone diseases are reported. MRT proved to be a sensitive method in evaluating localised bone lesions. MR provided definite advantages in comparison with computed tomography and plain films in the determination of the intramedullary and extraosseous extent of circumscribed bone lesions. A better characterisation of the nature and histology of bone changes was not possible with MRT. Diffuse bone marrow disease are well demonstrable via MRT.