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Sarcoidosis has an active inflammatory phase and an inactive fibrotic phase. 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) and gallium (67Ga) scintigraphy are known to be useful for detecting its active phase1 but not its inactive phase. Delayed enhancement with gadolinium during cardiac MRI is a useful modality for detecting cardiac sarcoidosis2 and can reveal inactive fibrotic lesions.3 In this case, a 66-year-old woman had gradually decreased her ejection fraction (<50%) with regional dyskinesia on echocardiography after her initial heart failure. Cardiac sarcoidosis had been suspected, but ACE assays were negative at follow-up visits. Her admission was for another episode of heart failure. ACE, FDG-PET and 67Ga scintigraphy results were negative. On cardiac MRI, however, she had characteristic findings of cardiac sarcoidosis, including transmural-delayed anteroseptal enhancement, midwall-delayed inferoseptal enhancement and subepicardial-delayed anterior and lateral wall enhancement (figure 1), with septal dyskinesia. Bilateral lymphadenopathy, purified protein derivative skin test and superficial cervical lymphadenopathy confirmed the presence of cardiac sarcoidosis. For differential diagnoses, dilated cardiomyopathy is not commonly associated with delayed subepicardial and lateral wall enhancement. Myocardial infarction and myocarditis are less likely. Subendocardial sparing is not seen in myocardial infarction, and the affected areas do not correspond with coronary territories. There were no inflammatory findings such as fever or elevated C reactive protein. Earlier cardiac MRI might have led to earlier treatment and prevention of disease progression. We conclude that once cardiac sarcoidosis is suspected, cardiac MRI should be considered, as it has a sensitivity of nearly 100%.2
Cardiac MRI is a useful modality for detecting the inactive phase of cardiac sarcoidosis.
Patients with positive results require careful follow-up.
Negative results for common tests such as an ACE assay and gallium scintigraphy should not be allowed to rule out cardiac sarcoidosis.
We would like to thank Dr Nanae Sato, Dr Hiroki Suzuki, Dr Kazutoshi Sato and Dr Atsushi Kuno for their kind advice and encouragement in the preparation of this manuscript.
Contributors YSH wrote the manuscript, and SK, HO and JK critically reviewed it.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.