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01.05.2014 | Urogenital

Routinely performed multiparametric magnetic resonance imaging helps to differentiate common subtypes of renal tumours

verfasst von: F. Cornelis, E. Tricaud, A. S. Lasserre, F. Petitpierre, J. C. Bernhard, Y. Le Bras, M. Yacoub, M. Bouzgarrou, A. Ravaud, N. Grenier

Erschienen in: European Radiology | Ausgabe 5/2014

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Abstract

Objectives

To retrospectively evaluate the ability of multiparametric magnetic resonance (MR) imaging to differentiate renal tumours.

Methods

MR images from 100 consecutive pathologically proven solid renal tumours without macroscopic fat [57 clear cell, 16 papillary and 7 chromophobe renal cell carcinomas (RCCs), 16 oncocytomas and 4 minimal fat angiomyolipomas (AMLs)] between 2009 and 2012 were evaluated. Two radiologists blinded to pathology results independently reviewed double-echo chemical shift, dynamic contrast-enhanced T1- and T2-weighted images and apparent diffusion coefficient (ADC) maps. Signal intensity index (SII), tumour-to-spleen SI ratio (TSR), ADC ratio, wash-in (WiI) and wash-out indices (WoI) between different phases were calculated.

Results

There were significant differences between papillary RCCs and other renal tumours for arterial WiI (P < 0.001), initial WoI (P = 0.006) and ADC ratio (P < 0.001); between chromophobe RCCs and oncocytomas for TSR (P = 0.02), parenchymal WiI (P = 0.03), late WiI (P = 0.02), initial WoI (P = 0.03) and late WoI (P = 0.04); and between clear cell RCCs and oncocytomas for SII (P = 0.01) and parenchymal WiI (P = 0.01). Papillary RCCs were distinguished from other tumours (sensitivity 37.5 %, specificity 100 %) and oncocytomas from chromophobe RCCs (sensitivity 25 %, specificity 100 %) and clear cell RCCs (sensitivity 100 %, specificity 94.2 %).

Conclusion

MR imaging provides criteria able to accurately distinguish papillary RCCs from other tumours and oncocytomas from chromophobe and clear cell RCCs.

Key Points

• Multiparametric MR parameters accurately distinguish papillary RCCs with high specificity (100 %).

• Oncocytomas can be distinguished from chromophobe RCCs with high specificity (100 %).

• Oncocytomas can be distinguished from clear cell RCCs with high specificity (94.2 %).

• In oncocytomatosis, imaging follow-up with such parameters analysis could be promoted.

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Titel: Routinely performed multiparametric magnetic resonance imaging helps to differentiate common subtypes of renal tumours
verfasst von: F. Cornelis
E. Tricaud
A. S. Lasserre
F. Petitpierre
J. C. Bernhard
Y. Le Bras
M. Yacoub
M. Bouzgarrou
A. Ravaud
N. Grenier
Publikationsdatum: 01.05.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: European Radiology / Ausgabe 5/2014
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-014-3107-z

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Routinely performed multiparametric magnetic resonance imaging helps to differentiate common subtypes of renal tumours