A: Early stage sarcoidosis (H&E stain, 20x) with a discrete perivascular granuloma (yellow arrows) comprised of epithelioid histiocytes, multinucleated giant cells, sparse lymphocytes and a lack of dense hyalinized collagen fibrosis. B: Late stage sarcoidosis (H&E stain, 20x) with a subpleural hyalinized nodule containing abundant dense eosinophilic hypocellular collagen fibrosis surrounding and bridging discrete granulomas (black arrows) with sparse lymphocytes. There prominent concentric lamellar fibrosis surrounding the granulomas, a finding characteristic of sarcoid granulomas association with scarring. Curtesy of Dr. M. A. Judson.