- Congenital Heart Defects: These include structural abnormalities such as ventricular septal defect, which can be identified histologically by examining the heart muscle and septum for irregularities. - Cystic Fibrosis: This genetic disorder affects epithelial tissue, particularly in the lungs and digestive system. Histology can reveal thick mucus secretions and tissue scarring. - Down Syndrome: A chromosomal disorder that can be identified through histological examination of tissues showing characteristic cellular morphology and the presence of an extra chromosome 21.