Fig. 2
From: Laryngeal chondritis as a differential for upper airway diseases in German sheep
Larynx, sheep, Case 2. a Cross section of the larynx shows a large central defect within the arytenoid cartilage (C) with an inflammatory cell infiltration within the cavitation (insert) and surrounding tissue and loss of cartilage (asterisk). H&E. Bar: 1 mm. b Loss of cartilage is confirmed by loss of stainability (asterisk). Safranin-O. c Numerous filamentous PAS-positive bacilli were present at the cartilaginous surface (arrowhead). PAS reaction. d Pre-existing cartilage (C) is replaced by highly vascularized granulation tissue (G) surrounding large areas of necrotic cartilage (asterisk). H&E