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Egg-shell like Calcification as a Protective Factor for Splenic Artery Aneurysm Dilatation
Masaya Sano1, Katsuyuki Hoshina1, Takuya Kawahara2
1Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku Tokyo, Japan.
Annals of Vascular Surgery
|October 19, 2019
Summary
Egg-shell appearance in splenic artery aneurysms (SAA) independently slows dilatation. This calcification pattern limits growth in larger aneurysms and those with portal hypertension, suggesting a protective role.
Area of Science:
- Vascular Surgery
- Radiology
- Gastroenterology
Background:
- Splenic artery aneurysms (SAA) are rare vascular malformations.
- Asymptomatic SAAs require evaluation for factors influencing their progression.
- Understanding dilatation factors is crucial for patient management.
Purpose of the Study:
- To identify factors associated with the dilatation of asymptomatic splenic artery aneurysms.
- To analyze the impact of comorbidities and anatomical features on SAA growth.
- To determine predictors of SAA dilatation rate.
Main Methods:
- Retrospective analysis of 70 SAA lesions in 59 patients (2001-2018).
- Measurement of SAA dilatation rate (mm/year).
- Evaluation of factors including egg-shell appearance, portal hypertension (PHT), and aneurysm diameter using regression models.
Main Results:
- Mean dilatation rate was 0.26 mm/year over a 4.6-year follow-up.
- Univariate analysis showed PHT, egg-shell appearance, and diameter >20 mm were associated with dilatation.
- Multivariate analysis identified egg-shell appearance as an independent inverse risk factor for dilatation.
Conclusions:
- Egg-shell appearance in SAA is an independent inverse predictor of dilatation rate.
- The presence of egg-shell appearance attenuates the effect of PHT and large diameter on SAA growth.
- Calcification patterns significantly influence SAA progression dynamics.
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