Diagnostic and Interventional Imaging (2014) 95, 1055—1063 ORIGINAL ARTICLE / Genito-urinary imaging Renal papillary carcinoma: CT and MRI features C. Couvidat a , D. Eiss a,* , V. Verkarre b , S. Merran c , J.-M. Corréas a , A. Méjean d,e , O. Hélénon a a Department of Adult Radiology, Necker Hospitals, Paris Public Hospitals Health Service, 149, rue de Sèvres, 75015 Paris, France b Department of Pathological Anatomy, Necker Hospitals, Paris Public Hospitals Health Service, 149, rue de Sèvres, 75015 Paris, France c Léonard-de-Vinci Medical Imaging, 43, rue Cortambert, 75016 Paris, France d Department of Urology, Necker Hospitals, Paris Public Hospitals Health Service, 149, rue de Sèvres, 75015 Paris, France e Georges-Pompidou European Hospital, Paris Public Hospitals Health Service, 20, rue Leblanc, 75015 Paris, France KEYWORDS Kidney; Papillary renal cell carcinoma; Renal cancer; CT; MRI Abstract Purpose: To describe the CT and MRI appearances of papillary renal cell carcinoma. Materials and methods: Retrospective study of 102 papillary carcinomas in 79 patients, 81 tumors examined by CT and 56 by MRI. Tumor size, homogeneity and contrast enhancement were recorded. Results: The most common presentation of papillary renal cell carcinoma was a small homoge- neous hypovascular tumor both on CT and MRI. Eighty-nine percent of lesions were hypointense on T2 weighted images compared to the renal parenchyma. Seventeen percent of the lesions did not significantly enhance with contrast on CT. All of the lesions examined on MRI had a significant enhancement percentage. Calcifications were rare and only seen in 7% of cases (CT). The second most common presentation was a bulky necrotic tumor. In addition, atypical types of disease were found which were difficult to diagnose, including infiltrating tumors and tumors with a fatty component. Conclusion: A homogeneous hypovascular renal tumor which is hypointense on T2 weighted images should suggest a diagnosis of papillary carcinoma. Some papillary carcinomas do not enhance significantly on CT. MRI is then required to diagnose the renal tumor. © 2014 Published by Elsevier Masson SAS on behalf of the Éditions françaises de radiologie. Abbreviations: PC, Papillary carcinoma; CCC, Clear cell carcinoma; CT, Computed tomography; MRI, Magnetic resonance imaging; PACS, Picture Archiving and Communication System; HU, Hounsfield unit; ROI, Region of interest; PI/OP, In phase/out of phase; AML, Angiomyolipoma. ∗ Corresponding author. E-mail address: david.eiss@nck.aphp.fr (D. Eiss). http://dx.doi.org/10.1016/j.diii.2014.03.013 2211-5684/© 2014 Published by Elsevier Masson SAS on behalf of the Éditions françaises de radiologie. © 2021 Elsevier Masson SAS. Tous droits réservés. - Document téléchargé le 14/12/2021 Il est interdit et illégal de diffuser ce document.