The diagnosis of dermatomyositis (DM) can be problematic. Serum levels of muscle enzymes are not elevated in every case, electromyography (EMG) presents with sampling errors and even findings of muscle biopsy specimens may be normal due to patchy muscle involvement. Moreover, the classic muscle findings are not present in all patients—the term amyopathic DM has been used to describe patients diagnosed as having DM with skin disease and no muscle findings.1 Particularly difficult is the detection of steroid myopathy in the follow-up of patients with DM. A muscle biopsy is not always helpful since type II atrophy and patches of inflammation may coexist.2- 3
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The T1-weighted image of the lateral compartment of upper thigh muscles does not show an abnormal signal (top). Inversion recovery (short TI inversion recovery) shows a high signal in the lateral compartment of the left upper thigh muscle (bottom).
Country-Specific Mortality and Growth Failure in Infancy and Yound Children and
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