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- $Unique_ID{BRK03985}
- $Pretitle{}
- $Title{Medullary Sponge Kidney}
- $Subject{Medullary Sponge Kidney Sponge Kidney Tubular Ectasia }
- $Volume{}
- $Log{}
-
- Copyright (C) 1986, 1989, 1990 National Organization for Rare Disorders, Inc.
-
- 223:
- Medullary Sponge Kidney
-
- ** IMPORTANT **
- It is possible the main title of the article (Medullary Sponge Kidney) is
- not the name you expected. Please check the SYNONYMS listing to find the
- alternate names and disorder subdivisions covered by this article.
-
- Synonyms
-
- Sponge Kidney
- Tubular Ectasia
-
- General Discussion
-
- ** REMINDER **
- The information contained in the Rare Disease Database is provided for
- educational purposes only. It should not be used for diagnostic or treatment
- purposes. If you wish to obtain more information about this disorder, please
- contact your personal physician and/or the agencies listed in the "Resources"
- section of this report.
-
-
- Medullary Sponge Kidney is a hereditary congenital defect characterized
- by dilation of the terminal collecting ducts in the kidneys. Often small
- calcium oxalate stones (calculi) appear in these ducts. This condition may
- affect one or both kidneys.
-
- Symptoms
-
- One or both kidneys may be affected in Medullary Sponge Kidney. Some of the
- papillary collecting ducts in the kidneys are dilated. This disorder is
- commonly associated with blood in the urine (hematuria) which can be
- recurrent.
-
- Infections of the urinary tract often are the first sign of an underlying
- abnormality. Kidney stones (nephrolithiasis) with renal colic, loin pain,
- and the excretion of small stones is one of the more prominent features of
- Medullary Sponge Kidney. The stones form in the dilated portions of the
- collecting ducts. They may consist of calcium oxalate, calcium phosphate and
- other types of calcium salts. The disease seldom progresses to end stage
- renal failure, although reduced glomurular filtration rates have been
- observed.
-
- The most common functional abnormalities include the inability of the
- kidney to concentrate the salts that are excreted as urine, and acidity of
- the body tissues (systemic acidosis) secondary to renal tubular acidosis.
- Kidney stones (nephrolithiasis) are a common clinical problem for patients
- with this disorder; it has been observed that 13% of patients who develop
- kidney stones have Medullary Sponge Kidney.
-
- Causes
-
- Medullary Sponge Kidney is an autosomal dominant hereditary disorder. (Human
- traits including the classic genetic diseases, are the product of the
- interaction of two genes for that condition, one received from the father and
- one from the mother. In dominant disorders, a single copy of the disease
- gene (received from either the mother or father) will be expressed
- "dominating" the normal gene and resulting in appearance of the disease. The
- risk of transmitting the disorder from affected parent to offspring is 50%
- for each pregnancy regardless of the sex of the resulting child.)
-
- A possible relationship between hyperparathyroidism and Medullary Sponge
- Kidney has been suggested.
-
- Affected Population
-
- Medullary Sponge Kidney is more common in males than in females.
-
- Therapies: Standard
-
- Patients with Medullary Sponge Kidney should take sufficient fluids in order
- to excrete about 2 liters of urine each day. Patients with too much calcium
- in the urine (hypercalciuria) may benefit from long-term therapy with
- thiazide diuretics as well as a high fluid intake. For patients with calcium
- urolithiasis and normal calcium excretion, oral phosphate therapy may be
- useful. A low calcium diet may prevent stone formation and thereby reduce
- obstruction complications. Patients should visit a physician at least yearly
- for routine urinalysis.
-
- Therapies: Investigational
-
- Calcium Acetate is a new orphan drug being used in the treatment of
- hyperphosphatemia in end stage renal disease (ESRD). It is manufactured by
- Pharmedic Co., 130 Exmoor Ct., Deerfield, IL 60015.
-
- This disease entry is based upon medical information available through
- January 1990. Since NORD's resources are limited, it is not possible to keep
- every entry in the Rare Disease Database completely current and accurate.
- Please check with the agencies listed in the Resources section for the most
- current information about this disorder.
-
- Resources
-
- For more information on Medullary Sponge Kidney, please contact:
-
- National Organization for Rare Disorders (NORD)
- P.O. Box 8923
- New Fairfield, CT 06812-1783
- (203) 746-6518
-
- National Kidney and Urologic Diseases Information Clearinghouse
- Box NKUDIC
- Bethesda, MD 20892
- (301) 468-6345
-
- The National Kidney Foundation
- 30 East 33rd St.
- New York, NY 10016
- (212) 889-2210
- (800) 622-9010
-
- American Kidney Fund
- 6110 Executive Blvd., Suite 1010
- Rockville, MD 20852
- (301) 881-3052
- (800) 638-8299
- (800) 492-8361 (MD)
-
-
- For information on genetics and genetic counseling referrals, please
- contact:
-
- March of Dimes Birth Defects Foundation
- 1275 Mamaroneck Avenue
- White Plains, NY 10605
- (914) 428-7100
-
- Alliance of Genetic Support Groups
- 35 Wisconsin Circle, Suite 440
- Chevy Chase, MD 20815
- (800) 336-GENE
- (301) 652-5553
-
- References
-
- THE MERCK MANUAL 15th ed: R. Berkow, et al: eds; Merck, Sharp & Dohme
- Research Laboratories, 1987. P. 1631.
-
- CECIL TEXTBOOK OF MEDICINE, 18th ed.: James B. Wyngaarden, and Lloyd H.
- Smith, Jr., Eds.: W. B. Saunders Co., 1988. Pp. 645-8.
-
-