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The differential diagnosis of nodules in a perilymphatic distribution is limited :
- the most common cause is sarcoidosis (typically symmetrical and upper lobes)
- also common is lymphangitis carcinomatosis (often asymmetrical and lower lobe)
- coal workers' pneumoconiosis uncommonly give this appearance
- rare causes include amyloidosis and lymphocytic interstitial pneumonitis
In this case the diagnosis was sarcoidosis.
- Webb WR, Higgins CB. Thoracic Imaging: Pulmonary and Cardiovascular Radiology. Lippincott, Williams & Wilkins 2005