Gross pathology of select lung specimens on necropsy. Panel A & B represent non-sensitized rabbits B1 and AF5, respectively. Neither display a discernable cavitary lesion but complete effacement of the right lower lung parenchyma by a tuberculoid pneumonia is present. Both had numerous bilateral granulomas of the visceral surface of the lung. Panel C & D include sensitized rabbits Bo(S)1 and AF1, respectively. Both rabbits display cavitary formation in the site of bronchoscopic infection of the right lower lobe. Similar gross pathology exists in the contralateral lungs in sensitized and non-sensitized rabbits.