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Adventitial cystic disease: a unifying hypothesis
1Department of Surgery, University of the Witwatersrand, Johannesburg, South Africa.
Insights
Adventitial cystic disease is a rare condition affecting nonaxial arteries. This study supports a developmental hypothesis, suggesting cell rests from developing joints contribute to its formation in these specific blood vessels.
Area of Science:
- Vascular biology
- Developmental biology
- Medical case studies
Background:
- Adventitial cystic disease (ACD) is a rare condition affecting arteries and veins.
- Existing theories on ACD etiology are diverse, necessitating further investigation into its origins.
- Understanding ACD's pathogenesis is crucial for effective diagnosis and treatment.
Purpose of the Study:
- To investigate the etiology of adventitial cystic disease (ACD).
- To review existing theories and present evidence for a developmental hypothesis of ACD.
- To explain the specific sites of occurrence of this rare condition.
Main Methods:
- Review of 323 documented cases of adventitial cystic disease.
- Analysis of the embryological origin of affected vessels.
- Inclusion of six clinical cases (four popliteal, one femoral, one radial artery) detailing features, treatment, and outcomes.
Main Results:
- All reported ACD cases occur in nonaxial arteries, which develop later during limb differentiation.
- A hypothesis is proposed: mesenchymal cell rests from developing joints (knee, hip, wrist, ankle) are incorporated into adjacent nonaxial vessels during weeks 15-22 of gestation.
- These incorporated cell rests are postulated to cause ACD later in life through mucoid material secretion.
Conclusions:
- Adventitial cystic disease is a developmental condition.
- The proposed hypothesis provides evidence for ACD occurring in nonaxial blood vessels.
- The specific localization of ACD is linked to embryological incorporation of joint-related cell rests into vessels.
Purpose:
Six cases of adventitial cystic disease were studied, and the existing theories of the aetiology of adventitial cystic disease were reviewed to present evidence in support of a variation of the developmental hypothesis that might explain the sites of occurrence of this rare condition.
Methods:
Cases of adventitial cystic disease were collected by interrogation of the records of a group of vascular surgeons in the Johannesburg area. After reviewing the relevant literature, the sites of occurrence of 323 cases of adventitial cystic disease were documented, and the theories of the formation of adventitial cystic disease were reviewed. The embryological origin of those vessels in which adventitial cystic disease occurs was investigated. Clinical cases were collected in private practice vascular referral centers. The clinical features, treatment, and subsequent course of six cases of adventitial cystic disease (four related to the popliteal artery, one in the femoral artery, and one in the radial artery) are included.
Results:
All cases of adventitial cystic disease reported have occurred in the nonaxial arteries, which form at a later stage than the axial vessels during limb differentiation and development. It is therefore postulated that during limb bud development cell rests derived from condensations of mesenchymal tissue destined to form the knee, hip, wrist, or ankle joints are incorporated into the nearby and adjacent nonaxial vessels during development of these vessels in the 15-22-week stage. These newly forming nonaxial vessels develop from vascular plexuses during the same stage of development, and in close proximity to the adjacent condensing joint structures. It is further postulated that these cell rests are then responsible for the formation of adventitial cystic disease later in life, when the mucoid material secreted results in a mass lesion within the arterial or venous wall.
Conclusion:
There is evidence supporting the hypothesis that adventitial cystic disease is a developmental condition occurring in the nonaxial blood vessels.