Gastrinoma: the predictive value of preoperative localization

Area of Science:

• Endocrinology
• Surgical Oncology
• Diagnostic Imaging

Background:

• Gastrinoma management often involves preoperative tumor localization tests.
• The predictive value of these preoperative tests for surgical outcomes is not well-established.
• Accurate localization is critical for planning curative surgical resection.

Purpose of the Study:

• To assess the predictive value of preoperative gastrinoma localization tests.
• To evaluate the efficacy of various imaging modalities in detecting primary and metastatic gastrinoma.
• To correlate preoperative findings with operative outcomes and surgical cure rates.

Main Methods:

• Retrospective review of preoperative investigations and operative outcomes in 23 gastrinoma patients.
• Analysis of computed tomography, angiography, ultrasonography, and magnetic resonance imaging efficacy.
• Laparotomy results served as the reference standard for tumor detection.

Main Results:

• Individual imaging modalities showed poor sensitivity (20-29%) for primary gastrinoma detection.
• Combined imaging sensitivity for primary tumors was 53% with a low negative predictive value (38%).
• Imaging was more accurate for metastatic disease (83% combined accuracy); laparotomy identified tumors in 83% of patients.

Conclusions:

• Preoperative localization of primary gastrinoma is unreliable.
• A negative preoperative workup does not exclude the possibility of primary gastrinoma or cure.
• Laparotomy with curative resection in mind is recommended for most gastrinoma patients, excluding those with MEN1 or metastasis.