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The value of MRI gray scale ratio in the differential diagnosis of adrenal pheochromocytoma and lipid-poor adrenal adenoma
YAN Chunlong  MA Jinfeng  QI Xianlong  ZHENG Ning 

Cite this article as: Yan CL, Ma JF, Qi XL, et al. The value of MRI gray scale ratio in the differential diagnosis of adrenal pheochromocytoma and lipidpoor adrenal adenoma. Chin J Magn Reson Imaging, 2020, 11(3): 216-218. DOI:10.12015/issn.1674-8034.2020.03.011.


[Abstract] Objective: To investigate the value of MRI gray scale ratio in the differential diagnosis of adrenal pheochromocytoma (PHEO) and lipid-poor adrenal adenoma (LPAA).Materials and Methods: The MRI enhancement data of 15 cases of adrenal PHEO and 10 cases of LPAA confirmed by operation and pathology were retrospectively analyzed. The solid part of the pre-enhanced lesion and the gray level of the same position were measured. The MRI gray scale ratios of each stage of enhancement were defined and calculated as (post-enhancement-pre-enhancement)/pre-enhancement ratios. The two groups were analyzed by independent sample t test, and the diagnostic efficiency was evaluated by ROC curve.Results: The grayscale ratios of MRI in the cortical, medullary and delayed phases of 15 PHEO groups and 10 LPAA groups were (2.686±0.506)/(3.828±4.452), respectively (t=-0.992, P=0.331), 2.479±0.390)/(1.412±0.483) (t=6.228, P<0.001), (2.105±0.402)/(1.074±0.380) (t=6.607, P<0.001), adrenal PHEO is rapid-lowering type strengthened, LPAA is a speed-up-down type enhancement. There was a statistically significant difference between the two groups in the medullary and delayed MR gray scale ratios. The area under the curve and the optimal threshold value for differentiating PHEO from LPAA were 0.976 and 2.045, 0.982 and 1.526, respectively. The corresponding sensitivity and specificity were 93.3% and 90.9%, 100.0% and 90.9%, respectively.Conclusions: The gray scale ratio of MRI has high clinical value in differential diagnosis of adrenal PHEO and LPAA, and can be used as an effective supplement for routine MR examination.
[Keywords] gray scale ratio；pheochromocytoma；lipid-poor adrenal adenoma

YAN Chunlong Department of Radiology, The first people's Hospital of Jining City, Shandong Province, Jining 272000, China

MA Jinfeng* Department of Hematology, The first people's Hospital of Jining City, Shandong Province, Jining 272000, China

QI Xianlong Department of Radiology, The first people's Hospital of Jining City, Shandong Province, Jining 272000, China

ZHENG Ning Department of Radiology, The first people's Hospital of Jining City, Shandong Province, Jining 272000, China

*Correspondence to: Ma JF, E-mail: yclky2012@126.com

Conflicts of interest   None.

Received  2019-11-05
Accepted  2020-02-12
DOI: 10.12015/issn.1674-8034.2020.03.011
Cite this article as: Yan CL, Ma JF, Qi XL, et al. The value of MRI gray scale ratio in the differential diagnosis of adrenal pheochromocytoma and lipidpoor adrenal adenoma. Chin J Magn Reson Imaging, 2020, 11(3): 216-218. DOI:10.12015/issn.1674-8034.2020.03.011.

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