Abstract
Purpose
Pituitary adenomas are common CNS tumors that can cause endocrine dysfunction due to hormone oversecretion and by mass effect on the normal gland. The study of pituitary adenomas and adjacent sellar anatomy with high-resolution 7 T MRI may further characterize endocrine dysfunction. The purpose of this study was to determine the efficacy of 7 T MRI in identifying radiological markers for endocrine function.
Methods
MR images obtained in 23 patients with pituitary adenomas were reviewed by consensus between three neuroradiologists. Landmarks and criteria were devised to measure radiological features of stalk, tumor, and normal gland. Fischer’s exact tests and nominal logistic regression were performed.
Results
Mean cross-sectional area of the stalk just below the infundibular recess was 6.3 ± 3.7 mm2. Mean curvature and deviation angles were 34.2° ± 23.2° and 29.7° ± 17.3°, respectively. Knosp scores obtained differed between 7 T and lower field strength scans (P < 0.0001 [right] and P = 0.0006 [left]). Ability to characterize tumor was rated higher at 7 T compared with lower field MRI, P = 0.05. Confidence in visualizing normal gland was also higher using 7 T MRI, P = 0.036. The six hormone-secreting tumors had higher corrected T2 mean SI than non-secreting tumors (2.54 vs. − 0.38, P = 0.0196). Seven patients had preoperative hypopituitarism and had significantly greater stalk curvature angles than patients without hypopituitarism (71.7° vs. 36.55°, P = 0.027).
Conclusion
Radiological characterization of pituitary adenomas and adjacent native pituitary tissue may benefit with the use of 7 T MRI. Corrected T2 SI of tumor may be a sensitive predictor of hormonal secretion and may be useful in the diagnostic work-up for pituitary adenoma.
Summary statement
7 T MRI may be valuable in identifying markers of endocrine function in patients with pituitary adenomas. Our results indicate that hormone-secreting tumors have higher T2-weighted SI and tumors associated with preoperative hypopituitarism have greater stalk curvature angles.
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Abbreviations
- ROI :
-
Region of interest
- SI:
-
Signal intensity
- SNR:
-
Signal-to-noise ratio
- T :
-
Tesla
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Funding
The following funding was received for this study: NIH R01 CA202911 and the Icahn School of Medicine Capital Campaign, Translational and Molecular Imaging Institute, and Department of Radiology, Icahn School of Medicine at Mount Sinai. No other sources of funding were received for this study.
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PB (the Principal Investigator in this study) is a named inventor on patents relating to magnetic resonance imaging (MRI) and RF pulse design. The patents have been licensed to GE Healthcare, Siemens AG, and Philips International and PB receives royalty payments relating to these patents. PB is a named inventor on patents relating to Slice-selective adiabatic magnetization T2-preparation (SAMPA) for efficient T2-weighted imaging at ultrahigh field strengths, methods for producing a semi-adiabatic spectral-spatial spectroscopic imaging sequence and devices thereof, and semi-adiabatic spectral-spatial spectroscopic imaging. These patents have been filed through MSIP; they remain unlicensed, there is no discussion to license them in the near future, and there are consequently no royalties revolving around them. The remaining authors declare no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.
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Key points
-7 T MRI yielded Knosp scores that were significantly different than those derived using lower field strength imaging.
-Secreting tumors had higher average T2-weighted SI than non-secreting tumors.
-Tumors associated with preoperative hypopituitarism had greater stalk curvature angles.
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Rutland, J.W., Pawha, P., Belani, P. et al. Tumor T2 signal intensity and stalk angulation correlates with endocrine status in pituitary adenoma patients: a quantitative 7 tesla MRI study. Neuroradiology 62, 473–482 (2020). https://doi.org/10.1007/s00234-019-02352-4
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DOI: https://doi.org/10.1007/s00234-019-02352-4