Sarcoidosis is a systemic disease with many localizations. Thyroid involvement has been often described but rarely confirmed histologically. A common immune mechanism appears to be the cause. Thyroid sarcoidosis should be envisaged in patients with a thyroid nodule and mediastino-pulmonary involvement. We report the case of a 63-year-old woman with no past history who was hospitalized for dyspnea. Explorations evidenced a cold thyroid nodule associated with diffuse interstitial lung disease and mediastinal node enlargement. Pathology examination disclosed the sarcoid nature of the thyroid nodule and the lung lesions.
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