Ultrasound-guided platelet-rich plasma injection improves pain, function and symmetry in lumbar myofascial pain syndrome: A case report

Figure 4 Magnetic resonance imaging. A: Mean difference of the cross-sectional area of the right and left quadratus lumborum measured by magnetic resonance imaging before treatment was 1.3 cm²; B: At 1-month follow-up, the mean difference of the right and left side (MD0 between the left and right was reduced to 0.8 cm²; C: In the last follow-up after 10 month of treatment, the MD between the left and right sides was further reduced to 0.3 cm²; The symmetry of both sides of muscle dimension gradually restored. MD: Mean difference of the right and left side.