• Incontinence: Loss of bladder or bowel control; the accidental loss of urine or feces.
• Infection: A condition resulting from the presence of bacteria or other microorganisms.
• Inferior vein cavography: X-rays are used to image the inferior vein and venous pressure measurements are taken above, below and within the organ.
• Inferior vena cava: A large vein that receives blood from the lower extremities, pelvis and abdomen and empties it into the right atrium of the heart.
• Infertility: The diminished ability or the inability to conceive and have offspring.
• Inflammatory: Characterized or caused by swelling, redness, heat and/or pain produced in an area of the body as a result of irritation, injury or infection.
• Intestine: The part of the digestive system between the stomach and the anus that digests and absorbs food and water.
• Intratesticular: Inside the testicle.
• Intravenous: Also referred to as IV. Existing or occurring inside a vein.
• Intravenous pyelography: A succession of X-ray films of the urinary tract following the injection into a vein of a contrast medium. An IVP tests kidney function and reveals the presence of stones, tumors, or obstruction in the urinary tract.
• Invasive: Having or showing a tendency to spread from the point of origin to adjacent tissue, as some cancers do. Involving cutting or puncturing the skin or inserting instruments into the body.
• Ionizing radiation: Electromagnetic radiation that produces ionization in a medium through which it passes.
• Ions: Electrically charged atoms.
• IV: Also referred to as intravenous. Existing or occurring inside a vein.
• IVP: Also referred to as intravenous pyelogram, intravenous urography or excretory urogram. An X-ray of the urinary tract. A dye is injected to make urine visible on the X-ray and show any blockage in the urinary tract.

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