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Achilles tendonitis detected by FDG-PET.

Increased metabolic activity in the region of the Achilles tendon is occasionally noted when the lower extremities are studied with PET scans. Although tendonitis has been a possible explanation for the uptake, corroborative evidence from other imaging modalities is usually absent. We report a case of abnormally increased FDG uptake in the Achilles tendon correlated with a diagnosis of tendonitis and MRI imaging abnormalities.