A 64-year-old woman comes to the clinic for follow-up after an incidental finding on a recent imaging study. Three weeks ago, she presented to the emergency department with a 1-day history of left flank pain and gross hematuria. A non-contrast CT scan of the abdomen and pelvis at that time demonstrated a 4-mm obstructing calculus in the left distal ureter, which she passed spontaneously. The patient currently has no abdominal pain, nausea, vomiting, or weight loss. Her past medical history is unremarkable, and she takes no medications. She does not use tobacco or consume alcohol. Physical examination shows a soft, non-tender abdomen with no palpable masses.
Laboratory studies from today are as follows:
Hemoglobin: 13.8 g/dL
Leukocyte count: 6,500/mm³
Platelet count: 250,000/mm³
Aspartate aminotransferase (AST): 22 U/L
Alanine aminotransferase (ALT): 25 U/L
Alkaline phosphatase: 138 U/L (Normal: 40-120 U/L)
Total bilirubin: 0.8 mg/dL
Lipase: 35 U/L
Review of the emergency department CT scan reveals an incidental 3.8-cm cystic lesion in the body of the pancreas. A dedicated multiphasic, contrast-enhanced abdominal MRI is performed to further characterize the lesion. The MRI demonstrates a well-circumscribed, multilocular cystic mass consisting of numerous small cysts, each measuring less than 1 cm in diameter, creating a "honeycomb" appearance. A prominent central, star-shaped fibrotic scar with central calcification is also visualized. The main pancreatic duct is not dilated, and there is no visible communication between the cysts and the ductal system.
Based on the interpretation of these specific imaging findings, which of the following is the most appropriate next step in management?
- ALaparoscopic distal pancreatectomy
- BEndoscopic ultrasound with fine-needle aspiration of the cyst fluid
- Reassurance and routine clinical observationCevap
- DSerum CA 19-9 measurement and positron emission tomography scan
- EMagnetic resonance cholangiopancreatography
Cevap
This patient's MRI reveals a pathognomonic imaging pattern for a serous cystadenoma (SCA) of the pancreas. The accurate interpretation of pancreatic cystic lesions is critical, as they vary widely in their malignant potential.
The key distinguishing radiologic features are:
| Cyst Type | Classic Imaging Features | Malignant Potential | Management |
|---|---|---|---|
| Serous Cystadenoma (SCA) | Microcystic (honeycomb), central stellate scar with calcification | Extremely rare (<1%) | Observation (unless symptomatic) |
| Mucinous Cystic Neoplasm (MCN) | Macrocystic, peripheral (eggshell) calcification, primarily in females | High | Surgical resection |
| Intraductal Papillary Mucinous Neoplasm (IPMN) | Communicates with the pancreatic duct; main duct dilation | High (especially main-duct) | Resection for main-duct or high-risk branch-duct |
| Pancreatic Pseudocyst | Unilocular, history of acute/chronic pancreatitis, high fluid amylase | None | Drainage only if symptomatic |