## Investigation of Choice for Fibroid Assessment **Key Point:** MRI pelvis is the gold standard for comprehensive fibroid evaluation, especially when surgical intervention is being considered. ### Why MRI is Superior | Feature | MRI | Ultrasound | CT | HSG | |---------|-----|-----------|----|---------| | **Fibroid characterization** | Excellent (T1/T2 signal) | Good (basic) | Limited | Not applicable | | **Number of fibroids** | Accurate count | May miss small fibroids | Fair | Not applicable | | **Junctional zone assessment** | Excellent | Poor | Fair | Not applicable | | **Adenomyosis detection** | Excellent | Poor | Poor | Not applicable | | **Surgical planning** | Optimal (location, depth, vascularity) | Limited | Limited | Not applicable | | **Radiation exposure** | None | None | Yes | Yes | **High-Yield:** MRI provides: 1. Precise fibroid mapping (intramural, submucosal, subserosal) 2. Assessment of junctional zone involvement (predicts hysterectomy need) 3. Detection of concurrent adenomyosis (affects treatment choice) 4. Vascular flow assessment (guides myomectomy planning) **Clinical Pearl:** The junctional zone thickness on MRI (>12 mm) predicts poor outcomes with myomectomy alone and may necessitate hysterectomy. ### Why Other Options Are Suboptimal **Hysterosalpingography (HSG):** - Evaluates only the uterine cavity outline - Cannot assess myometrial fibroids or adenomyosis - Useful for infertility workup, NOT fibroid assessment **CT Abdomen and Pelvis:** - Exposes patient to ionizing radiation - Poor soft tissue contrast for fibroid characterization - Cannot reliably differentiate fibroid subtypes **Diagnostic Laparoscopy:** - Invasive procedure - Cannot assess intramural fibroids adequately - Reserved for therapeutic intervention, not diagnostic assessment [cite:Telner & Ferenczy, SOGC Guidelines on Uterine Fibroids]
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