The main stem of the Bay itself is about 189 miles (304 km) long, from the Susquehanna River in the north to the Atlantic Ocean in the south. At its narrowest point near Annapolis, Maryland, the Bay is 4 miles (6.4 km) wide; at its widest point, near the mouth of the Potomac River, it is 30 miles (50 km) wide.
Patau syndrome. Patau syndrome is a syndrome caused by a chromosomal abnormality, in which some or all of the cells of the body contain extra genetic material from chromosome 13. The extra genetic material disrupts normal development, causing multiple and complex organ defects.
Blood clot (thrombus) formation that causes superior vena cava syndrome is a complication of pacemaker wires,dialysis, and other intravenous catheters that are threaded into the superior vena cava. Historically, and in other parts of the world, infection (syphilis and tuberculosis) is another cause of superior vena cava syndrome.