## Metastatic Spread in Cervical Cancer **Key Point:** Lymph node metastasis (pelvic and para-aortic nodes) is the most common site of spread in cervical cancer, occurring in 15–20% of early-stage disease and up to 60% in advanced stages. ### Pattern of Spread in Cervical Cancer | Site of Metastasis | Frequency | Stage Association | Clinical Significance | | --- | --- | --- | --- | | Pelvic lymph nodes | 15–60% (stage-dependent) | IB–IVA | Determines staging and prognosis | | Para-aortic nodes | 5–20% | IB–IVA | Upstages to IVB if involved | | Distant organs (lung, liver, bone) | 5–15% | IVB | Poor prognosis | | Brain | <2% | Late/terminal | Rare, late manifestation | ### Lymphatic Drainage Pathway 1. **Primary drainage:** Pelvic lymph nodes (internal iliac, external iliac, obturator) 2. **Secondary drainage:** Para-aortic (lumbar) lymph nodes 3. **Tertiary spread:** Distant organs (lungs, liver, bone, brain) **High-Yield:** Pelvic lymph node involvement is the single most important prognostic factor in cervical cancer. Patients with pelvic node metastases have significantly reduced 5-year survival compared to those with node-negative disease. ### Clinical Pearl **Clinical Pearl:** Para-aortic node involvement (even without pelvic node disease) upstages cervical cancer to stage IVB, which carries a 5-year survival of ~10%. This is why imaging (CT, PET-CT, MRI) and sometimes surgical staging (laparoscopic pelvic and para-aortic lymphadenectomy) are critical in treatment planning. ### Hematogenous vs. Lymphatic Spread - **Lymphatic spread (common):** Predictable, orderly progression through pelvic → para-aortic nodes. - **Hematogenous spread (late):** Occurs after lymph node involvement; lungs and liver are the most common distant sites, but this is uncommon in early-stage disease. [cite:Park 26e Ch 20]
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