Abstract
This study evaluates the diagnostic and therapeutic implications of somatostatin-receptor scintigraphy in the management of patients with proven or high clinical suspicion of gastroenteropancreatic endocrine tumors. Forty-one patients were studied by planar and tomographic imaging at 4 h and 24 h after 111In-pentetreotide injection. Scintigraphic findings were compared with computed tomography, and in several patients also with ultrasound, angiography, biopsy, and/or surgery, when performed. Among 23 patients with carcinoid tumor, three of nine primary tumors were initially identified by scintigraphy. Unsuspected mesenteric metastases found on scintigraphy in three patients led to octreotide treatment. Scintigraphic detection of multiple metastases in a patient with thyroid metastasis of bronchial carcinoid spared her an unnecessary total thyroidectomy. Among 18 patients with 19 islet-cell tumors, scintigraphy detected three of five insulinomas, whereas computed tomography identified only one. Receptor positivity in an islet-cell tumor (vipoma?) with no metastases on the scan led to surgical removal of the primary tumor. Receptor-positive metastases of gastrinoma (two of three patients), glucagonoma (two of three patients), and...Continue Reading
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