Fig. 5From: Anatomic, histopathologic, and echocardiographic features in a dog with an atypical pulmonary valve stenosis with a fibrous band of tissue and a patent ductus arteriosusA normal pulmonary valve and an abnormal dysplastic valve with a fibrous band of tissue. a Opening of normal pulmonary valve in systole. b Closing of normal pulmonary valve in diastole. c Incomplete opening of dysplastic pulmonary valve with fibrous band of tissue in systole. d Incomplete closing of dysplastic pulmonary valve with fibrous band of tissue in diastole. Asterisk indicate a fibrous band of tissueBack to article page