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[Detection of lateral lymph node metastasis by PET/CT]
Yuichiro Watanabe1, Keiichiro Ishibashi, Satoshi Hatano
1Dept. of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University.
Gan to Kagaku Ryoho. Cancer & Chemotherapy
|March 4, 2015
Summary
Positron emission tomography/computed tomography (PET/CT) showed low sensitivity for detecting lateral lymph node metastasis in locally advanced lower rectal cancer patients. While accurate, PET/CT alone is not sufficient for diagnosing these metastases.
Area of Science:
- Oncology
- Radiology
- Surgical Oncology
Background:
- Preoperative imaging for locally advanced lower rectal cancer lacks a definitive gold standard.
- Accurate staging is crucial for effective treatment planning and surgical intervention.
Purpose of the Study:
- To evaluate the utility of positron emission tomography/computed tomography (PET/CT) in diagnosing lateral lymph node metastasis.
- To determine if PET/CT is a suitable standalone diagnostic tool for this specific patient group.
Main Methods:
- Retrospective analysis of 45 patients with locally advanced lower rectal cancer.
- Patients underwent curative surgery and lateral lymph node dissection without neoadjuvant chemotherapy.
- Preoperative PET/CT scans were analyzed for metastasis in 180 specific lymph node regions.
Main Results:
- Lateral lymph node metastasis was identified in 10 cases (13 regions).
- PET/CT demonstrated high specificity (98.8%) and accuracy (93.3%).
- However, sensitivity (23.1%) and positive predictive value (60.0%) were notably low.
Conclusions:
- PET/CT alone is insufficient for diagnosing lateral lymph node metastasis in locally advanced lower rectal cancer.
- The low sensitivity of PET/CT limits its standalone diagnostic capability despite high accuracy.
