Enhancement patterns of adrenal nodules on magnetic resonance imaging
Int. braz. j. urol
;
48(2): 294-302, March-Apr. 2022. tab, graf
Article
in English
| LILACS
| ID: biblio-1364942
ABSTRACT
ABSTRACT Objective:
To compare enhancement patterns of typical adrenal adenomas, lipid-poor adenomas, and non-adenomas on magnetic resonance imaging (MRI). Materials andMethods:
Evaluation of adrenal nodules larger than 1.0 cm, with at least 2-year follow-up, evaluated on MRI in January 2007 and December 2016. Two different protocols were included - upper abdomen MRI (delayed phase after 3 minutes) and abdomen and pelvis MRI (delayed phase after 7 minutes) - and nodules were divided in typical adenomas (characterized on out-of-phase MRI sequence), lipid-poor adenomas (based on follow-up imaging stability) and non-adenomas (based on pathological finding or follow-up imaging). T2-weighted and enhancement features were analyzed (absolute and relative washout and enhancement curve pattern), similarly to classic computed tomography equations.Results:
Final cohort was composed of 123 nodules in 116 patients (mean diameter of 1.8 cm and mean follow up time of 4 years and 3 months). Of them, 98 (79%) nodules had features of typical adenomas by quantitative chemical shift imaging, and demonstrated type 3 curve pattern in 77%, mean absolute and relative washout of 29% and 16%, respectively. Size, oncologic history and T2-weighted features showed statistically significant differences among groups. Also, a threshold greater than 11.75% for absolute washout on MRI achieved sensitivity of 71.4% and specificity of 70.0%, in differentiating typical adenomas from non-adenomas.Conclusion:
Calculating absolute washout of adrenal nodules on MRI may help identifying proportion of non-adenomas.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Adrenal Gland Neoplasms
Type of study:
Diagnostic study
/
Observational study
/
Prognostic study
Limits:
Humans
Language:
English
Journal:
Int. braz. j. urol
Journal subject:
Urology
Year:
2022
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Hospital Israelita Albert Einstein/BR
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