Abstract
Purpose: To assess the prevalence, significance, and practical value of two recently described CT signs of instable aneurysm: The crescent sign (a curvilinear high-attenuating density within the thrombus) and the periluminal halo (a low-attenuating internal layer of the thrombus around the patent lumen). Material and methods: Among the CT examination performed in the last 5 years, we retrospectively selected the nonruptured aneurysms with a diameter exceeding 4 cm (no. = 93, average diameter 5.1 cm, unenhanced images in 28 cases and enhanced in 84) and the ruptured aneurysms (no. = 16, average diameter 6.7 cm, unenhanced images in 9 cases and enhanced in 9). We studied the prevalence of the crescent and halo sign, their relationship with the aneurysm diameter, and the effect of contrast enhancement Results: The crescent sign was identified with a statistically significant prevalence in ruptured (37.5% of cases) over asymptomatic aneurysms (5.5%); the halo, instead, had the same frequency in the 2 groups (12.5% and 9.5%, respectively). Both signs were more frequent in bigger aneurysms and were recognizable without differences in unenhanced and enhanced images. Conclusions: The crescent sign, though not exclusive of aneurysmal rupture, indicates instability and its detection should lead to careful follow-up or surgical repair. The halo seems to have no real value as risk factor.
| Original language | Italian |
|---|---|
| Pages (from-to) | 392-395 |
| Number of pages | 4 |
| Journal | Radiologia Medica |
| Volume | 93 |
| Issue number | 4 |
| Publication status | Published - Apr 1997 |
Fingerprint
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
Cite this
La semiluna e l'alone periluminale : Due segni con Tomografia Computerizzata di aneurisma aortico a rischio di rottura? / Catalano, Orlando; Cusati, Bianca; Rotondo, Antonio.
In: Radiologia Medica, Vol. 93, No. 4, 04.1997, p. 392-395.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - La semiluna e l'alone periluminale
T2 - Due segni con Tomografia Computerizzata di aneurisma aortico a rischio di rottura?
AU - Catalano, Orlando
AU - Cusati, Bianca
AU - Rotondo, Antonio
PY - 1997/4
Y1 - 1997/4
N2 - Purpose: To assess the prevalence, significance, and practical value of two recently described CT signs of instable aneurysm: The crescent sign (a curvilinear high-attenuating density within the thrombus) and the periluminal halo (a low-attenuating internal layer of the thrombus around the patent lumen). Material and methods: Among the CT examination performed in the last 5 years, we retrospectively selected the nonruptured aneurysms with a diameter exceeding 4 cm (no. = 93, average diameter 5.1 cm, unenhanced images in 28 cases and enhanced in 84) and the ruptured aneurysms (no. = 16, average diameter 6.7 cm, unenhanced images in 9 cases and enhanced in 9). We studied the prevalence of the crescent and halo sign, their relationship with the aneurysm diameter, and the effect of contrast enhancement Results: The crescent sign was identified with a statistically significant prevalence in ruptured (37.5% of cases) over asymptomatic aneurysms (5.5%); the halo, instead, had the same frequency in the 2 groups (12.5% and 9.5%, respectively). Both signs were more frequent in bigger aneurysms and were recognizable without differences in unenhanced and enhanced images. Conclusions: The crescent sign, though not exclusive of aneurysmal rupture, indicates instability and its detection should lead to careful follow-up or surgical repair. The halo seems to have no real value as risk factor.
AB - Purpose: To assess the prevalence, significance, and practical value of two recently described CT signs of instable aneurysm: The crescent sign (a curvilinear high-attenuating density within the thrombus) and the periluminal halo (a low-attenuating internal layer of the thrombus around the patent lumen). Material and methods: Among the CT examination performed in the last 5 years, we retrospectively selected the nonruptured aneurysms with a diameter exceeding 4 cm (no. = 93, average diameter 5.1 cm, unenhanced images in 28 cases and enhanced in 84) and the ruptured aneurysms (no. = 16, average diameter 6.7 cm, unenhanced images in 9 cases and enhanced in 9). We studied the prevalence of the crescent and halo sign, their relationship with the aneurysm diameter, and the effect of contrast enhancement Results: The crescent sign was identified with a statistically significant prevalence in ruptured (37.5% of cases) over asymptomatic aneurysms (5.5%); the halo, instead, had the same frequency in the 2 groups (12.5% and 9.5%, respectively). Both signs were more frequent in bigger aneurysms and were recognizable without differences in unenhanced and enhanced images. Conclusions: The crescent sign, though not exclusive of aneurysmal rupture, indicates instability and its detection should lead to careful follow-up or surgical repair. The halo seems to have no real value as risk factor.
KW - Aneurysms - Aortic aneurysms
KW - Aorta
KW - CT
KW - Rupture - Aortic aneurysms
UR - http://www.scopus.com/inward/record.url?scp=0031114457&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031114457&partnerID=8YFLogxK
M3 - Articolo
VL - 93
SP - 392
EP - 395
JO - Radiologia Medica
JF - Radiologia Medica
SN - 0033-8362
IS - 4
ER -