Urinary Bladder Leiomyoma

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30 year old woman presents with urinary symptoms particularly increased frequency and urgency and low volume voids and some urge incontinence. Elena G. Violari M.D. ? Bladder Leiomyoma Right hemi-pelvic lobulated T2 hypo-intense soft tissue mass measuring 3.9 x 5.6 x 7.2 cm. The mass arises from the urinary bladder wall. MRI Coronal T2W MRI Sagittal T2W MRI DWI axial MRI ADC axial MRI axial T1W MRI axial T2W Bladder leiomyoma Epidemiology: • Rare benign tumor predominantly found in women. • Most common benign urinary bladder neoplasm but accounts for only 0.4% of all bladder tumors. Clinical presentation: • Most are small and asymptomatic and are discovered incidentally. Large tumors manifest with symptoms as: – Hesitancy, frequency, dribbling – Hematuria – Pressure from mass effect – Urinary obstruction Pathology: • Non-infiltrative smooth muscle tumor with low mitotic activity, cellular atypia and necrosis. Leiomyoma arises in the submucosa. Growth may be submucosal (7%), intra-vesical (63%) or extra-vesical (30%). Bladder Leiomyoma Radiographic features: • Ultrasound: – Smooth-walled homogeneous hypoechoic solid mass in the bladder with thin echogenic surface. – Determine endo-vesical, intramural, or extra-vesical nature of lesion. – Reveal smooth-walled solid lesion with homogeneous echogenicity. • CT: – Accurate detection and localization of these lesions by presenting it as hypo-dense mass. – Contrast-enhanced CT shows a moderately enhancing mass. • MRI: – T1: Intermediate signal density – T2: Low signal density, Degenerated leiomyomas have more heterogeneous signal characteristics; cystic areas have high signal intensity. – T1 C+ (Gd): Contrast enhancement is variable; degenerated areas lack enhancement. References: • References 1. Wong-you-cheong JJ, Woodward PJ, Manning MA et-al. From the Archives of the AFIP: neoplasms of the urinary bladder: radiologic-pathologic correlation. Radiographics. 26 (2): 553-80. 2. Sudhakar PJ, Malik N, Malik A. Leiomyoma of bladder. Saudi J Kidney Dis Transpl. 2008;19 (2): 232-5. 3. Yung-Wei Lin, Thomas I-Sheng Hwang. 3. Leiomyoma of Urinary Bladder: A Case Report and Literature Review. J Urol Roc Vol.12 No.2, June 2001.

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