Background: Physiotherapeutic scoliosis-specific exercises (PSSE) have demonstrated promising results in patients with adolescent idiopathic scoliosis (AIS). The focus in these studies is often on radiological outcomes, that is, changes in the degrees of curvature of the spine. Asymmetry in AIS involves, besides the spine, other structures of the trunk so changes in trunk symmetry and patient's perceptions of them are important for evaluating the effects of treatment. Aim: To investigate the effect of PSSE on trunk asymmetry and to determine relationship between objective measures and subjective perception in children with AIS. Subjects and methods: Twenty-four subjects with AIS (5 male and 19 female) between 10-18 years (13.6±2.2 years) underwent PSSE treatment according to Barcelona Scoliosis Physical Therapy School (BSPTS) method. The intervention consisted of 15 individual treatments, 5 times a week, 60 minutes per day. Angle of trunk inclination was assessed with scoliometer. Trunk photographs in standing position were taken and analyzed to calculate Posterior Trunk Symmetry Index (POTSI) and Anterior Trunk Symmetry Index (ATSI). All subjects completed Trunk Appearance Perception Scale (TAPS). Results: Objective measures of symmetry, ATSI and POTSI values, showed statistically significant improvement (p<0.001) and large effect size after the intervention. Cohen's d was 0.766 for ATSI, and 1.784 for POTSI. No statistically significant differences were found in the subjective results, TAPS values. No significant correlations were found between subjective and objective indicators of trunk symmetry. Conclusion: Exercises according to the BSPTS method have significant effect on reducing trunk asymmetry, however the correlation between objective measures and subjective perception in children with AIS is poor.