COMPARATIVE ANALYSIS OF PROSTATE VOLUME MEASUREMENT USING TRANSABDOMINAL ULTRASOUND, TRANSRECTAL ULTRASOUND, AND MRI: A RETROSPECTIVE OBSERVATIONAL STUDY Introduction: Prostate volume (PV) measurement is crucial for managing prostate conditions, including benign prostatic hyperplasia (BPH). Its range can be measured using different imaging modalities like transabdominal ultrasound (TAUS), transrectal ultrasound (TRUS), and magnetic resonance imaging (MRI) of the prostate, which were compared in this study. Methods: A single tertiary centre retrospective observational analysis was conducted on PV measurements obtained through TAUS, TRUS, and MRI prostate from the same patients prior to biopsy. The mean of PV from each imaging modality was analysed using the Analysis of Variance (ANOVA) and a Tukey post hoc test, with p < 0.05 was considered statistically significant. Results: Only 311 out of 718 patients who underwent TRUS biopsy from January 2018 until December 2022 were eligible for this study based on the inclusion criteria. The median age and PSA were 71 years old and 7.5 ng/mL, respectively. No significant difference was found across the means of the imaging modality and PV measurement among the imaging modalities (F = 0.713, p = 0.49). The Tukey post hoc test also revealed no significant difference between each modality, namely TAUS-TRUS (p = 0.45), MRI-TRUS (p = 0.79), and TAUS-MRI (p = 0.85). Conclusion: This study demonstrated no statistically significant relationship in prostate volume measurements from the three different imaging modalities, namely TAUS, TRUS, and MRI.