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Radiologically defined lipid-poor adrenal adenomas: histopathological characteristics

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Abstract

Background

Adrenal lipid-poor adenomas (LPA) are defined by high unenhanced density (≥ 10 HU), and absolute and relative contrast medium washout > 60% and > 40%, respectively, at computerized tomography (CT). To date, no thorough histopathological characterization has been performed in those frequent lesions (one-third of adrenal adenomas). Our aim was to analyze the histopathological characteristics of adrenal LPA.

Methods

Patients with LPA (n = 57) were selected among consecutive subjects referred for an adrenal incidentaloma or ACTH-independent Cushing syndrome. FluoroDeoxyGlucose-Positron Emission Tomography (FDG-PET) was performed in 37 patients. In patients treated by adrenalectomy (n = 17), Weiss score and Lin–Weiss–Bisceglia score (in tumors composed entirely or predominantly of oncocytes) were calculated.

Results

Radiological parameters did not differ among patients with ACTH-independent Cushing syndrome (n = 6) and those with adrenal incidentalomas associated with primary aldosteronism (n = 2), autonomous cortisol secretion (n = 14), or non-functioning (n = 35). Patients treated by adrenalectomy had larger tumors (28.9 ± 11.2 vs 17.3 ± 8.4 mm, P < 0.001), higher CT unenhanced density (29.1 ± 11.0 vs 23.1 ± 9.0 HU, P = 0.043), and FDG-PET adrenal uptake (9.0 ± 6.4 vs 4.4 ± 2.3 SUV, P = 0.003) than non-operated ones. Oncocytic features > 75% of the tumor were detected in 12/17 cases (70.6%). Five of those showed borderline-malignant histopathological characteristics by Lin–Weiss–Bisceglia score. Among remaining non-oncocytic tumors, 1/5 had a Weiss score ≥ 3. Overall, 6/17 tumors (35.3%) had borderline-malignant potential. Radiological parameters were similar between patients with benign and borderline-malignant tumors.

Conclusions

Adrenal LPA are a heterogeneous group of tumors, mostly composed of oncocytomas. Up to 1/3 of those tumors may have a borderline-malignant potential at histopathology.

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Acknowledgements

The Multidisciplinary Adrenal Team-Bologna (MAT-BO) includes the following medical specialists: VV, UP, GDiD, GZ, BB (Division of Endocrinology, Department of Medical and Surgical Sciences, University of Bologna), CM, CB, RG (Division of Radiology, S. Orsola-Malpighi Hospital, Bologna), ERC, CB (Hypertension Unit, Department of Medical and Surgical Sciences, University of Bologna), CN (Metropolitan Nuclear Medicine, S. Orsola-Malpighi Hospital, Bologna), SS, FM (General Surgery, Department of Medical and Surgical Sciences, University of Bologna), ADeL, DS (Pathology Unit, University of Bologna), MAP, MS, MN (Department of Experimental, Diagnostic and Specialty Medicine, Sant’Orsola-Malpighi Hospital, and “G. Prodi” Interdepartmental Center for Cancer Research, University of Bologna).

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This research did not receive any specific grant from any funding agency in the public, commercial, or not-for-profit sector.

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Correspondence to G. Di Dalmazi.

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The study was approved by the local ethics committee of the S. Orsola-Malpighi Hospital (CE-AVEC).

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De Leo, A., Mosconi, C., Zavatta, G. et al. Radiologically defined lipid-poor adrenal adenomas: histopathological characteristics. J Endocrinol Invest 43, 1197–1204 (2020). https://doi.org/10.1007/s40618-020-01198-5

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  • DOI: https://doi.org/10.1007/s40618-020-01198-5

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