Objective To present the MRI features of cutaneous malignant melanoma(cMM)of extremities in Tibet.Methods MRI findings were retrospectively evaluated in 10 cases of cMM,a11 of which were confirmed pathologically.10 patients were examined by MRI plain scan.The location of the tumor,the invasion range,signal intensity of each lesion were observed,the size of the tumors were measured.Results 3 cases were located in the hand(2 in the tips of the thumb,1 on the thenar eminence),6 cases on the foot(5 on the planta pedis),1 case on the forearm.10 cases had soft tissue masses.Subcutaneous tissues were invaded in 7 cases,adjacent tendons and bones were invaded in 3 cases.On T1WI,5 lesions showed intermediate and high heterogeneous signal,and 2 lesions presented as intermediate and low hetero-geneous signal,1 showed intermediatesignal,1 showed hyperintense signal,1 demonstrated high and low heterogeneous signal.On PDWI,3 lesions had hyperintense signal;4 lesions were noted as high and low heterogeneous signal,one of which had fluid-fluid levels;3 were seen intermediate and high heterogeneous signal.Conclusion Cutaneous tumor,a soft tissue mass with bone destruction in the tips of the fingers or toes,and intratumoral T,hyperintensity were helpful for the diagnosis of cMM of extremities in Tibet.
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