Tetralogy of Fallot is a birth defect that affects normal blood flow through the heart. It happens when a babyâs heart does not form correctly as the baby grows and develops in the motherâs womb during pregnancy. It is a congenital defect, meaning the baby is born with it.Tetralogy of Fallot is made up of the following four defects of the heart and its blood vessels: 1  A hole in the wall between the two lower chambersâor ventricles âof the heart. 2  This condition also is called a ventricular septal defect.t is a congenital defect, meaning the baby is born with it. Tetralogy of Fallot is made up of the following four defects of the heart and its blood vessels: 1  A hole in the wall between the two lower chambersâor ventricles âof the heart. 2  This condition also is called a ventricular septal defect.
A drey â or dray â is a nest of a tree squirrel or a flying squirrel. Dreys are usually built of twigs, dry leaves, and grass, and typically assembled in the forks of a tall tree.They are sometimes referred to as âdrey nestsâ to distinguish them from squirrel âcavity nestsâ (also termed âdensâ).quirrels may also nest in attics or exterior walls of buildings, where a drey may be regarded as a fire hazard, as some squirrels have a habit of gnawing on electrical cables. At other times, squirrels may inhabit a permanent tree den in the hollow of a trunk or large branch.
LoeysâDietz syndrome (LDS) is an autosomal dominant genetic connective tissue disorder.The disorder is marked by aneurysms in the aorta, often in children. The aorta may also undergo sudden dissection in the weakened layers of the wall of aorta.Aneurysms and dissections also can occur in arteries other than the aorta.oeysâDietz syndrome (LDS) is an autosomal dominant genetic connective tissue disorder.