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Clinical experience with white blood cell‐PET/CT in autosomal dominant polycystic kidney disease patients with suspected cyst infection: A prospective case series
Author(s) -
Kim Hyunsuk,
Oh Yun Kyu,
Park Hayne Cho,
Park Seokwoo,
Lee Soojin,
Lee Hoyoung,
Hwang YoungHwan,
Ahn Curie
Publication year - 2018
Publication title -
nephrology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 61
eISSN - 1440-1797
pISSN - 1320-5358
DOI - 10.1111/nep.13080
Subject(s) - medicine , autosomal dominant polycystic kidney disease , white blood cell , cyst , prospective cohort study , polycystic kidney disease , kidney , kidney disease , pathology , gastroenterology , radiology
Aims Cyst infection (CI) is a common problem in patients with autosomal dominant polycystic kidney disease (ADPKD). Localization is of great importance in CI. We describe the clinical experience with [18F] FDG‐labelled white‐blood cell (WBC) PET/CT in detecting CI in ADPKD. Methods Nineteen ADPKD patients (M:F = 7:12) suspected of having CI were enrolled in this prospective study. All underwent WBC‐PET/CT and MRI or CT. The degree of their WBC accumulation was evaluated from the maximal standardized uptake value of cystic wall. Results Cyst infection was diagnosed in 14 cases [definite ( n = 6), probable ( n = 1), or possible ( n = 7); kidney ( n = 11), or liver ( n = 3)]. There was no difference in fever or laboratory findings (White blood cell count, C‐reactive protein, culture results, and eGFR). The blood culture was positive only in a subset of CI patients ( n = 4). Cyst fluid culture yielded bacterial growth in 80% of aspirates. WBC‐PET/CT detected 64% of CI cases, whereas conventional imaging, 50%. WBC‐PET/CT showed false‐positive results in two of five cases with no CI. The reasons for false negatives with WBC‐PET/CT were poor host immune reaction, low virulence, or prior antibiotic therapy. Haemorrhagic cysts were the most common cause of false positivity in WBC‐PET/CT. However, WBC‐PET/CT detected CI in three cases, in which the conventional imaging failed to find CI. Conclusions Clinical information may play little role in the diagnosis of CI. WBC‐PET/CT can be used to detect CI with better sensitivity in ADPKD patients, circumventing the exposure to contrast media.

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