PMID- 33245481 OWN - NLM STAT- MEDLINE DCOM- 20210413 LR - 20210417 IS - 1826-6983 (Electronic) IS - 0033-8362 (Print) IS - 0033-8362 (Linking) VI - 126 IP - 4 DP - 2021 Apr TI - Complicated pyelonephritis associated with chronic renal stone disease. PG - 505-516 LID - 10.1007/s11547-020-01315-7 [doi] AB - PURPOSE: This article reviews imaging manifestations of complicated pyelonephritis associated with chronic renal stones disease, in particular xanthogranulomatous pyelonephritis (XGP) and emphysematous pyelonephritis (EPN), as potential mimics of other renal diseases and malignances and provides helpful tips and differentiating features that may alert the radiologist to suspect a diagnosis of infection. MATERIALS AND METHODS: A retrospective review of the records from 6 adult patients (5 females and 1 male, mean age 72,3 years) with diagnosis of XGP associated with chronic nephrolithiasis and 7 adult patients (6 females and 1 male, mean age 59,3 years) with diagnosis of EPN associated with chronic nephrolithiasis from January 2010 to January 2020 was carried out. Computed tomography urography (CTU) with at least an unenhanced scan, and the parenchymal and excretory phases after contrast medium administration performed at our Teaching Hospital were included. When available images related to conventional radiography, ultrasound (US) and magnetic resonance imaging of the same patients, the comparison with CTU images was carried out. CONCLUSION: A possible diagnosis of XGP or EPN must always be taken into account when a pyelonephritis is associated with untreated kidney stones, especially whenever clinical presentation is atypical, current therapy is not effective and imaging shows features of dubious interpretation. Due to their rarity and atypical presentation, a multidisciplinary approach is required and an expert radiologist represents a key figure in the multidisciplinary team as he can help to differentiate between benign and malignant lesions and thus avoid unnecessary radical surgical procedures. FAU - Ciccarese, Federica AU - Ciccarese F AD - Department of Radiology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, Bologna, Italy. FAU - Brandi, Nicolo AU - Brandi N AUID- ORCID: 0000-0003-0574-3455 AD - Department of Radiology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, Bologna, Italy. nicolo.brandi@studio.unibo.it. FAU - Corcioni, Beniamino AU - Corcioni B AD - Department of Radiology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, Bologna, Italy. FAU - Golfieri, Rita AU - Golfieri R AD - Department of Radiology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, Bologna, Italy. FAU - Gaudiano, Caterina AU - Gaudiano C AD - Department of Radiology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, Bologna, Italy. LA - eng PT - Journal Article PT - Review DEP - 20201127 PL - Italy TA - Radiol Med JT - La Radiologia medica JID - 0177625 RN - 0 (Contrast Media) SB - IM MH - Aged MH - Chronic Disease MH - Contrast Media MH - Diagnosis, Differential MH - Female MH - Humans MH - Kidney Calculi/complications/*diagnostic imaging MH - Kidney Neoplasms/*diagnostic imaging MH - Magnetic Resonance Imaging MH - Male MH - Middle Aged MH - Pyelonephritis/complications/*diagnostic imaging MH - Retrospective Studies MH - Ultrasonography MH - *Urography PMC - PMC8007507 OTO - NOTNLM OT - Complicated pyelonephritis OT - Emphysematous pyelonephritis OT - Nephrolithiasis OT - Renal stone disease OT - Xanthogranulomatous pyelonephritis COIS- All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript. EDAT- 2020/11/28 06:00 MHDA- 2021/04/14 06:00 PMCR- 2020/11/27 CRDT- 2020/11/27 12:08 PHST- 2020/07/02 00:00 [received] PHST- 2020/11/16 00:00 [accepted] PHST- 2020/11/28 06:00 [pubmed] PHST- 2021/04/14 06:00 [medline] PHST- 2020/11/27 12:08 [entrez] PHST- 2020/11/27 00:00 [pmc-release] AID - 10.1007/s11547-020-01315-7 [pii] AID - 1315 [pii] AID - 10.1007/s11547-020-01315-7 [doi] PST - ppublish SO - Radiol Med. 2021 Apr;126(4):505-516. doi: 10.1007/s11547-020-01315-7. Epub 2020 Nov 27.