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Timing and Clinical Features of Spontaneous Decrease in Size of Small Pancreatic Cystic Lesions without High-Risk
Hyun Woo Lee1, Sung Koo Lee2, Jae Hyuck Jun2
1Digestive Disease Center and Research Institute, Department of Internal Medicine, Soonchunhyang University School of Medicine, Bucheon, Korea.
Gut and Liver
|May 7, 2019
Summary
Small pancreatic cystic lesions (PCLs) without high-risk features can spontaneously decrease in size over approximately 3 years. Complete resolution is possible, especially when underlying malignancy is absent, suggesting a safe follow-up strategy.
Area of Science:
- Gastroenterology and Hepatology
- Oncology
- Radiology
Background:
- Investigating the natural history of spontaneous size decrease in pancreatic cystic lesions (PCLs).
- Focusing on PCLs lacking high-risk stigmata.
- Understanding factors influencing PCL resolution.
Purpose of the Study:
- Determine the timeline for spontaneous size reduction in PCLs.
- Identify characteristics predicting complete resolution of PCLs.
- Evaluate the role of imaging in assessing PCLs.
Main Methods:
- Retrospective analysis of 78 patients with PCLs showing size decrease on CT/MRI.
- Minimum 1-year follow-up data from 2000-2016.
- Utilized CT, MRI, and Endoscopic Ultrasound (EUS) for detailed characterization.
Main Results:
- Average follow-up of 55.7 months; 37.2% achieved complete resolution.
- Average time to initial decrease was 32.1 months; complete resolution averaged 41.5 months.
- Underlying malignancy was linked to partial PCL resolution (HR 0.51). EUS detected key features like septa, calcifications, and lobulations.
Conclusions:
- Asymptomatic PCLs without high-risk stigmata can resolve spontaneously within ~3 years.
- Absence of malignancy is associated with complete PCL resolution.
- A ~3-year follow-up strategy using EUS is a safe alternative for managing small PCLs.
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