If left untreated, thrombosis in these structures in the leg can lead to pulmonary embolism.
One of these structures malfunctions in the Nutcracker phenomenon and these structures are studied in the field of phlebology. An object named after these structures connects digestive organs to the liver, and that structure is the "hepatic portal" type of these. If left untreated, thrombosis in these structures in the leg can lead to pulmonary embolism. Wearing compression socks can correct the "spider" and "varicose" types of these structures. The pulmonary type of these structures are anomalous in that they carry oxygenated blood. For 10 points, name these vessels that, unlike arteries, carry blood from capillaries towards the heart.
One of these structures malfunctions in the Nutcracker phenomenon and these structures are studied in the field of phlebology.
veins [prompt on blood vessels] &lt;AG&gt;