皮膚悪性腫瘍におけるMRIの診断的意義の検討

抄録

For surgical treatment of malignant tumors, it is important to clarify the depth and area of invasion of tumors and the relation to surrounding normal tissues such as adipose tissue, muscles and bones in addition to the histological diagnosis of the tumors before operation. For this purpose we clinically evaluated a magnetic resonance imaging (MRI) for diagnosing skin tumors. A MRI, SIGNA (GE), whic analyzes the tumors by a spin echo method (TR 1500, TE 20) was used in this study, and 29 slices of MRI in a tumor were accumulated crossing those tumors. The usefulness of three dimensional presentation of skin tumors performed by the MRI data was also discussed. For three dimensional presentation, Voxelflinger^TM was applied and those images were compared with cross section of those tumors during operation and histological specimens. We applied the MRI examination on patients with malignant melanoma, malignant fibrous histiocytoma, fibrosarcoma and squamous cell carcinoma of skin.
The MRI was a very useful tool to clarify the depth and area of invasion of malignant tumors and the relation to surrounding normal tissues. The effects of MRI was most remarkable when applied onpatients with malignant melanoma of soles. Three dimensional presentation obtained from the MRI data was also useful to know three dimensional condition of those tumors but it seems still to have limitation because of the analytical software of the computer. In conclusion, we suggest that MRI should be the imaging modality of choice in evaluating skin tumors especially of the extremities, and three-dimensional analysis will be beneficial as well as that of using slice images in the future.