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Peer-reviewedCC BY-NCIJU case reports

Refractory Retroperitoneal Abscess Caused by Hypermucoviscous Klebsiella pneumoniae Requiring Open Surgical Drainage.

  • Shota Kikuchi1
  • Yoshihiro Nakagami1
  • Kanji Hirota1
  • Takuya Yashima1
  • Toshiki Mugita1
  • Sho Okada1
  • Motoki Yamagishi1
  • Masakazu Nagata1
  • Kazuhiko Oshinomi1
  • Takashi Fukagai1
  1. 1Department of Urology Showa Medical University School of Medicine Tokyo Japan.
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Abstract

Introduction

Klebsiella pneumoniae is broadly classified into classical and hypervirulent pathotypes, with the latter associated with invasive infections and hematogenous dissemination.Case presentation

An 89-year-old woman presented with fever and fatigue. Imaging revealed a large retroperitoneal abscess. Klebsiella pneumoniae was isolated from both pus and urine cultures, and the string test was positive. The clinical response to nonsurgical treatment was poor; however, definitive infection control was achieved after open surgical drainage.Conclusion

This case highlights serial reassessment and kidney-preserving open drainage for string test-positive infection refractory to percutaneous source control.

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Cite

BibTeXRIS
BibTeX
@article{kikuchi2026refractory,
  title = {{Refractory Retroperitoneal Abscess Caused by Hypermucoviscous Klebsiella pneumoniae Requiring Open Surgical Drainage.}},
  author = {Shota Kikuchi and Yoshihiro Nakagami and Kanji Hirota and Takuya Yashima and Toshiki Mugita and Sho Okada and Motoki Yamagishi and Masakazu Nagata and Kazuhiko Oshinomi and Takashi Fukagai},
  journal = {IJU case reports},
  year = {2026},
  month = nov,
  doi = {10.1002/iju5.70287},
  url = {https://europepmc.org/article/MED/43011449},
  note = {CC BY-NC},
}
RIS
TY  - JOUR
TI  - Refractory Retroperitoneal Abscess Caused by Hypermucoviscous Klebsiella pneumoniae Requiring Open Surgical Drainage.
AU  - Shota Kikuchi
AU  - Yoshihiro Nakagami
AU  - Kanji Hirota
AU  - Takuya Yashima
AU  - Toshiki Mugita
AU  - Sho Okada
AU  - Motoki Yamagishi
AU  - Masakazu Nagata
AU  - Kazuhiko Oshinomi
AU  - Takashi Fukagai
PY  - 2026
DA  - 2026/11/09
JO  - IJU case reports
DO  - 10.1002/iju5.70287
UR  - https://europepmc.org/article/MED/43011449
AB  - Introduction  Klebsiella pneumoniae is broadly classified into classical and hypervirulent pathotypes, with the latter associated with invasive infections and hematogenous dissemination.Case presentation  An 89-year-old woman presented with fever and fatigue. Imaging revealed a large retroperitoneal abscess. Klebsiella pneumoniae was isolated from both pus and urine cultures, and the string test was positive. The clinical response to nonsurgical treatment was poor; however, definitive infection control was achieved after open surgical drainage.Conclusion  This case highlights serial reassessment and kidney-preserving open drainage for string test-positive infection refractory to percutaneous source control.
SN  - 2577-171X
ER  -