The study will be conducted at a single center with 20 women diagnosed with unilateral upper extremity lymphedema after mastectomy. Participants will be evaluated using the MyotonPRO device by two trained raters to assess intra- and inter-rater reliability. Ultrasonographic grading of subcutaneous echogenicity and echo-free space, as well as circumference and volume measurements, will be conducted to explore correlations with biomechanical tissue properties. Statistical analysis will include intraclass correlation coefficient (ICC) for reliability and Pearson correlation for validity. This study is expected to support the clinical use of MyotonPRO in lymphedema assessment.
