Table 1.
The clinical and examination results of the 129 patients with PM / DM.
Table 2.
Characteristics of 105 patients presented with inflammatory lesions on WBMRI.
Fig 1.
WBMRI showed significantly increased signal intensity (white arrow) in both shoulders, upper extremities, pelvic muscles and lumbar muscles. The severity of muscle edema in both thighs was significantly lower than that in the above-mentioned sites.
Table 3.
Extramuscular changes on STIR-WBMRI in 129 patients.
Fig 2.
75-year-old male patient, displaying DM with bilateral lung ILD, bilateral femoral head necrosis.
Follow-up WBMRI showed patchy, reticulonodular and ground glass opacities in bilateral lungs; the most pronounced in the lower right lobe (white arrow). Both femoral heads showed the osteonecrosis area (white arrow) surrounded by curving high signal.
Fig 3.
61-year-old female patient, displaying DM with lung ILD, osteonecrosis in both knees.
WBMRI showed bilateral tibia osteonecrosis (white arrow) and fibrous streaks (white arrow) in the outer lung field, suggesting the presence of ILD.
Table 4.
Comparison of WBMRI and CT on ILD diagnosis in 61patients.
Fig 4.
43-year-old male patient, displaying DM with nasopharyngeal cancer and cervical lymph nodes metastases, multiple bone metastases and bilateral femoral head necrosis.
Figure 4A showed the avascular necrosis at bilateral femoral head (white arrows); and Figure 4B showed swollen lymph node on the left side of the neck (white arrow); Figure 4C showed patchy abnormal high signals in the thoracic and lumbar spine and pelvis (white arrow). Vertebral biopsy confirmed skeletal metastases.
Fig 5.
35-year-old male DM patient, with lung fungal infection and bilateral osteonecrosis of the knee after steroid therapy.
WBMRI showed multiple spherical lesions in bilateral lungs (white arrow), and the osteonecrosis area (white arrow) surrounded by curvy high signal in the upper left tibia.
Fig 6.
60-year-old woman, displaying DM with thyroid cancer.
WBMRI showed enlargement of the left thyroid, in which there were oval-shaped, abnormally high signals (white arrow) that was diagnosed as thyroid cancer by biopsy.