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Imaging in alkaptonuria

N Misson1, C Van Ruyssevelt, J Mullier

  • 1Department of Radiology, Clinique Saint Pierre, Ottignies, Belgium.

Journal Belge De Radiologie
|April 1, 1996
PubMed
Summary
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Alcaptonuria causes homogentisic acid buildup, leading to ochronotic arthropathy. This report details the specific radiologic signs of this rare amino acid metabolism disorder.

Area of Science:

  • Biochemistry
  • Genetics
  • Radiology

Background:

  • Alcaptonuria is an inherited disorder of amino acid metabolism.
  • Characterized by the deficiency of the enzyme homogentisate 1,2-dioxygenase.
  • Leads to the accumulation of homogentisic acid (HGA) in various body tissues.

Observation:

  • Homogentisic acid deposits in connective tissues, including cartilage and tendons.
  • These deposits cause a progressive, degenerative arthropathy known as ochronotic arthropathy.
  • The condition affects joints, leading to pain, stiffness, and reduced mobility.

Findings:

  • Radiologic manifestations of ochronotic arthropathy are described.
  • Imaging findings include joint space narrowing, subchondral sclerosis, and erosions.

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  • Characteristic "whirl-like" calcifications may be observed in affected joints.

    • Implications:

    • Early recognition of radiologic findings aids in diagnosis.
    • Understanding the progression of ochronotic arthropathy is crucial for patient management.
    • Further research into therapeutic strategies for alcaptonuria and its complications is warranted.