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Adrenal masses: characterization with T1-weighted MR imaging.
J L Chezmar1, S M Robbins, R C Nelson
1Department of Radiology, Emory University School of Medicine, Atlanta, GA 30322.
Radiology
|February 1, 1988
Summary
T1-weighted magnetic resonance (MR) imaging can help differentiate adrenal masses. However, overlap exists, meaning biopsy is still essential for definitive diagnosis of benign versus malignant adrenal tumors.
Area of Science:
- Radiology and Imaging
- Oncology
- Endocrinology
Background:
- Adrenal masses are common, requiring accurate differentiation between benign and malignant types.
- Magnetic resonance (MR) imaging is a key modality for evaluating adrenal lesions.
Purpose of the Study:
- To investigate the efficacy of T1-weighted spin-echo MR sequences at 0.5 Tesla for distinguishing benign from malignant adrenal masses.
- To assess the diagnostic performance of adrenal mass-to-liver and adrenal mass-to-fat signal intensity ratios.
Main Methods:
- Retrospective analysis of 35 adrenal masses in 28 patients using T1-weighted spin-echo MR imaging at 0.5 T.
- Calculation of adrenal mass-to-liver and adrenal mass-to-fat signal intensity ratios.
- Correlation of signal intensity ratios with histopathological diagnoses (adenoma, metastasis, pheochromocytoma, neuroblastoma).
Main Results:
- Specific adrenal mass-to-liver signal intensity ratios effectively differentiated metastases (≤0.71) from adenomas (≥0.78), with overlap in 31% of cases.
- Specific adrenal mass-to-fat signal intensity ratios differentiated metastases (≤0.35) from benign lesions (≥0.42), with overlap in 31% of cases.
- T1-weighted MR imaging showed specificity similar to T2-weighted imaging, but significant overlap necessitates further investigation.
Conclusions:
- T1-weighted spin-echo MR imaging can aid in differentiating benign from malignant adrenal masses, particularly when signal intensity ratios are extreme.
- Significant overlap in signal intensity ratios between benign and malignant adrenal masses limits definitive diagnosis.
- Histopathological confirmation via biopsy remains essential for accurate diagnosis when clinical management depends on distinguishing benign from malignant adrenal lesions.