Category: R
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Rhabdomyoma
A nonmalignant tumor of skeletal muscle tissue. A rare benign tumor of skeletal muscle or heart muscle. A malignant tumor originating in, or showing the characteristics of, striated muscle. Pleomorphic rhabdomyosarcoma occurs in late middle age, in the muscles of the limbs. Embryonal rhabdomyosarcomas, affecting infants, children, and young adults, are classified as botryoid (in…
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Rhabdomyolysis
Acute and fulminating destruction of muscle tissue; it is possibly fatal. A skeletal muscle injury that can result in kidney damage. The condition is caused by toxic effects from the pigment myoglobin when it is released by muscle cells damaged by trauma or other events. When damaged muscle tissue releases myoglobin into the bloodstream, it…
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Retinoschisis
A split or tear in the retina of the eye. A splitting of the retina into two layers with cyst formation between the layers.
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Retinopexy
Surgical procedure used to re-attach a detached retina using cryotherapy to freeze the tissue and fix all three layers (sclera, choroid, retina) together. A procedure involving diathermy, used in the treatment of retinal detachment to create the formation of adhesions between the detached portion and the underlying tissue.
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Retained placenta
Failure to deliver the placenta within 30 minutes after childbirth. A placenta that is not expelled by the uterus after birth. To remove the placenta, the doctor usually administers an anesthetic to the mother, reaches inside the uterus, and removes the placenta. The mother is then given a drug to encourage the uterus to contract…
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Restless leg syndrome
Condition of unknown etiology where the patient has the urge to move the legs to such a degree that it prevents rest and/or sleep. Also known as RLS, a condition characterized by unpleasant, restless sensations in the legs and an irresistible impulse to move them. People with RLS may experience tingling, twitching, fidgeting, aching, prickling,…
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Renal vein
Paired blood vessels of the kidneys that return deoxygenated blood from the kidneys, suprarenal glands, and ureters. A vein that drains blood from the kidney and joins the inferior vena cava. Blood clots may form in the renal veins in the nephrotic syndrome.
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Renal transplantation
The process of placing a donor kidney into a patient. The grafting of a kidney from a living donor or from a cadaver to an individual with renal failure. It is used as the definitive form of renal replacement for patients with kidney failure. Tissue typing for HLA antigens as well as ABO blood groups…
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Renal pyramid
The cone-shaped structures forming the kidney medulia. The inner mass of the kidney consisting of 5 to 11 conical renal pyramids separated by renal columns. The renal pyramids contain the loops of Henle and the collecting ducts. The renal columns contain interlobar arteries and veins.
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Renal ptosis
Kidney drop resulting from loss of supporting adipose tissue.