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It was diagnosed by accident. I was scheduled for a routing blood checkup and they found it. I believe the best test that they can do is a PET scan. A Pet scan takes a look on how your body consume sugars (energy). Sarcoidosis are little granulomas (grain size tumors) that resides on and in any organ in the body. Like all tumors, they consume more sugar than normal cells and show up as bright spots on an MRI. For me, my liver, spleen, and lymph nodes all showed up as big bright spots.