Rhabdomyolysis revisited: magnetic resonance (MR) imaging in detail

초록

urpose: To retrospectively evaluate magnetic resonance (MR) imaging finding of rhabdomyolysis in detail. MethodsandMaterials: Eighteen patients (14 males and 4 women age range, 24 - 88 years; mean age, 49.4 years) were included in this study. Signal intensity on T1- and T2-weighted images, presence of intramuscular haemorrhage, pres- ence of stipple sign, presence of non-enhancing portion in muscle, increased volume of muscle, abnormal signal intensity in subcutaneous fat layer and deep fascia are evaluated. Results: On T1-weighted image, 11 patients (11/18, 61.1%) showed homogeneous iso signal intensity and 7 (11/18, 38.9%) patients showed heterogeneous mixed high and iso signal intensity. On T2-weighted image, 9 (9/18, 50%) patients showed heterogeneous signal intensity combined high and low signal intensity. Ten patients (10/18, 55.6%) had T1 high or T2 dark signal intensity in muscle representing haemorrhage. Twelve patients (12/18, 66.7%) had stippled sign. Seven patients (7/18, 38.9%) had focal or diffuse non-enhancing portion in involved muscle. Fifteen patients (15/18, 83.3%) showed increased volume of muscle. Nine patients (9/18, 50%) had T2 high signal intensity oedema in subcutaneous fat layer. T2 high signal intensity in facial plane is seen 11 patients (11/18, 61.1%). Conclusion: Increased volume of muscle is most common imaging finding in rhabdomyolysis on MRI. Other common imaging findings were stippled sign, T2 high signal intensity in facial plane, intramuscular haemorrhage, T2 high signal intensity oedema in subcutaneous fat layer, and focal or diffuse non-enhancing portion in involved muscle.