Enhancement patterns of adrenal nodules on magnetic resonance imaging
AUTOR(ES)
Yamauchi, Fernando Ide; Lemos, George Ramos; Dubinco, André; Paiva, Omir Antunes; Mussi, Thais Caldara; Baroni, Ronaldo Hueb
FONTE
International braz j urol
DATA DE PUBLICAÇÃO
2022
RESUMO
ABSTRACT Objective: To compare enhancement patterns of typical adrenal adenomas, lipid-poor adenomas, and non-adenomas on magnetic resonance imaging (MRI). Materials and Methods: 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.
Documentos Relacionados
- Frequency of lipid-poor adrenal adenomas in magnetic resonance imaging examinations of the abdomen
- Evaluation of pulmonary nodules by magnetic resonance imaging sequences: which sequence will replace computed tomography?
- Magnetic resonance imaging.
- Basics of Magnetic Resonance Imaging
- Nuclear magnetic resonance imaging