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Definition:

Aase syndrome is a rare disorder that involves anemia and certain joint and skeletal deformities.



Alternative Names:

Aase-Smith syndrome; Hypoplastic anemia/Triphalangeal thumb syndrome



Causes, incidence, and risk factors:

Most cases of Aase syndrome occur without a known reason and are not passed down through families (inherited). However, some cases have been shown to be inherited.

The anemia in Aase syndrome is caused by poor development of the bone marrow, which is where blood cells are formed.



Symptoms:
  • Absent or small knuckles
  • Cleft palate
  • Decreased skin creases at finger joints
  • Deformed ears
  • Droopy eyelids
  • Inability to fully extend the joints from birth (contracture deformity )
  • Narrow shoulders
  • Pale skin
  • Triple-jointed thumbs


Signs and tests:

Signs may include:

  • Delayed closure of soft spots (fontanelles )
  • Mildly slowed growth

Tests that may be done include:



Treatment:

Blood transfusions are given in the first year of life to treat anemia. Prednisone has also been used to treat anemia associated with Aase syndrome. However, it should only be used after reviewing the benefits and risks with a doctor who has experience treating anemias.

A bone marrow transplant may be necessary if other treatment fails.



Support Groups:



Expectations (prognosis):

The anemia tends to improve with age.



Complications:

Complications related to anemia include:

  • Fatigue
  • Decreased oxygen in the blood
  • Weakness

Heart problems can lead to a variety of complications, depending on the specific defect.

Severe cases of Aase syndrome have been associated with stillbirth or early death.



Calling your health care provider:

Call your health care provider if you notice possible signs of Aase syndrome in your child. Genetic counseling is recommended if you have a family history of Aase syndrome. Genetic counseling can help families understand issues such as how the disease is inherited, and the care, treatment, and possible outcome of the patient.



Prevention:

There is no known prevention.




Review Date: 8/11/2009
Reviewed By: Diana Chambers, MS, EdD, Certified Genetics Counselor (ABMG), Charter Member of the ABGC, University of Tennessee, Memphis, TN. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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