Cardiac sarcoidosis presenting as multiple right intra-atrial masses mimicking cardiac tumor.

Background: Cardiac sarcoidosis though in itself, a rare entity, very rarely presents primarily with conduction abnormalities as the primary manifestation in the spectrum of presentations accounted by this chronic granulomatous systemic disease. Sarcoidosis presenting as intra-atrial masses is virtually unheard of.

Case: A middle aged female presented with progressive conduction system disease was found to have right atrial masses of unclear etiologic on relevant imaging. Over the course of 3 months she underwent a dual-chamber ICD implant for her eventual complete heart block and a surgical resection following an inconclusive biopsy of the right atrial free wall mass. She was then diagnosed with cardiac sarcoidosis and started on immunosupressants almost instantaneously as a part of her treatment.

Conclusion: This is an entirely new and unreported presentation of cardiac sarcoidosis as an intra-atrial mass. Through this case we bring light to cardiac sarcoidosis as a potential differential for intra-cardiac masses and how with available data do we go about treating it.