Incidentally Detected Subclinical Limbic Encephalitis on 18F-Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography in a Patient with Myasthenia Gravis and Sarcoidosis: A Rare Immunological Triad?

Limbic encephalitis is the inflammation of the medial temporal lobe structures due to direct infectious or indirect autoimmune etiology. Sarcoidosis is a rare cause of limbic encephalitis, has been reported by some authors. Association has also been reported between sarcoidosis, myasthenia gravis, and limbic encephalitis. We report an interesting case of 18F-fluorodeoxyglucose positron emission tomography/computed tomography demonstrating limbic encephalitis and sarcoidosis in a known case of myasthenia gravis.