Highlights
- •The high rate of IRF relapse led to prolonged therapy in most patients
- •Persistent retroperitoneal fibrosis FDG uptake is an independent factor associated with IRF relapse
- •FDG/PET CT may help clinicians to better target therapy in IRF.
Abstract
Background
The aim of this study was to evaluate the prognostic value of persistent retroperitoneal
fibrosis FDG uptake using FDG/PET CT in patients with idiopathic retroperitoneal fibrosis
(IRF).
Methods
In this monocentric retrospective cohort study, all patients admitted for IRF from
January 2009 to December 2017 underwent a FDG/PET CT at diagnosis and during follow
up. Metabolic activity of IRF was assessed by retroperitoneal fibrosis FDG uptake
measured as maximal standardized uptake value (SUVmax). The primary outcome was IRF
relapse rate during follow-up.
Results
23 consecutive patients (54.7 [36.9–89] years, 73.9% of men) diagnosed with IRF had
FDG/PET CT imaging performed at diagnosis, 3.1 [1–8.7] months (i.e 1st evaluation)
and 10.4 [4.9–17.5] months (i.e 2nd evaluation) after diagnosis. High FDG retroperitoneal
fibrosis uptake was present in all patients at diagnosis (SUVmax 6.5 [3.8–11.9]) and
persisted in 16 (69.6%; SUVmax 3.65 [2.1–5.4]) and 12 (52.2%; SUVmax 3.75 [2.7–7.8])
patients, at 1st and 2nd evaluation respectively. All but one patient had received
steroids at IRF diagnosis and 21 (91.3%) were in complete remission at both 1st and
2nd evaluation. During a median follow-up period of 38.7 [3–106.9] months, 6 (26.1%)
patients suffered IRF relapse that occurred 15.7 [9.2–42.8] months after diagnosis.
Multivariate analysis showed that only persistent retroperitoneal fibrosis FDG uptake
at 2nd evaluation was associated with IRF relapse (p = .046).
Conclusions
In IRF, persistent retroperitoneal fibrosis FDG uptake during follow up is associated
with clinical outcome. FDG/PET CT may help to better stratify the risk of relapse
and target therapy in IRF.
Keywords
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Article info
Publication history
Published online: January 31, 2019
Accepted:
January 30,
2019
Received in revised form:
January 10,
2019
Received:
November 26,
2018
Footnotes
☆This work was supported by the Département Hospitalo-Universitaire DHU “FIRE
Identification
Copyright
© 2019 European Federation of Internal Medicine. Published by Elsevier B.V. All rights reserved.