Final answer:
In lower extremities, phlebitis may present as Deep Vein Thrombosis (DVT), which is a formation of a blood clot in a deep vein, commonly in the leg.
Step-by-step explanation:
Phlebitis is defined as inflammation of the veins. In lower extremities, it may present as Deep Vein Thrombosis (DVT). This condition is depicted as a blood clot forming in a deep vein of the leg. Varicose veins, described in Figure 20.8, are also commonly found in the lower limbs and arise when defective valves allow blood to accumulate, causing the veins to become distended and twisted. While varicose veins can increase the risk of developing clots, they are not the same as DVT. Peripheral artery disease (PAD) involves the narrowing of arteries and is distinct from vein inflammation, presenting typically with pain during walking that resolves with rest. Cellulitis is an infection of the skin and underlying tissues and is not directly related to vein inflammation.