Somatostatin Receptor Scintigraphy Aiding the Exclusion of Cardiac Sarcoidosis in a Patient with Duodenal Neuroendocrine Tumor who Developed Complete Atrioventricular Block.

Authors

Keisho Kurokawa, Akinori Higaki, Motohira Yoshida, Rikako Horie, Ryo Miyabe, Amane Otoi, Hiroshi Kawakami, Osamu Yamaguchi

Published in

Internal medicine (Tokyo, Japan). Jul 11, 2026. Epub Jul 11, 2026.

Abstract

Cardiac sarcoidosis is a major cause of complete atrioventricular block. Although fluorodeoxyglucose-positron emission tomography (FDG PET/CT) is valuable for the diagnosis, inadequate fasting may result in a physiological myocardial uptake, making interpretation difficult. Somatostatin receptor scintigraphy (SRS), which does not require fasting, has been reported to detect myocardial inflammation in patients with DCM. We herein report the case of a 72-year-old man who developed complete atrioventricular block after surgery for a duodenal neuroendocrine tumor. In this patient, FDG PET/CT showed a marked cardiac uptake, while SRS findings suggested a low likelihood of cardiac sarcoidosis. In patients with malignancies and cardiovascular diseases, SRS may be useful for excluding cardiac sarcoidosis.

PMID:
42438019
Bibliographic data and abstract were imported from PubMed on 13 Jul 2026.

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