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CT detection of fat retention in the bladder after partial nephrectomy

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Abstract

Purpose

This study aimed to investigate the frequency of fat retention in the bladder using postoperative computed tomography (CT) and the associated imaging or clinical findings in patients who underwent renal tumor surgery.

Methods

We retrospectively reviewed postoperative CT images from 123 patients who underwent surgery for renal tumors (92 patients after partial nephrectomy and 31 after total nephrectomy). Furthermore, we evaluated preoperative tumor characteristics per an established standardized nephrometry scoring system (the R.E.N.A.L Nephrometry Score) for patients with partial nephrectomy. We also investigated whether collecting system repair occurred during surgery.

Results

Fat retention in the bladder was found in 5 patients (5.4%) after partial nephrectomy, but was not observed in any patients after total nephrectomy. No fat retention was seen immediately after partial nephrectomy (4–8 days), but occurred 2–15 months after the surgery. Subsequently, intravesical fat retention disappeared in 3 patients (8, 24, and 16 months later), and it persisted from 19–22 months after surgery in the remaining 2 patients. Collecting system repair occurred in 25 patients (27%) with partial nephrectomy. There was no statistically significant association between fat retention in the bladder and intraoperative collecting system repair (p = 0.12). The association with intravesical fat retention was not significant for either tumor size, distance to the collecting system, or the R.E.N.A.L. Nephrometry Score.

Conclusion

Fat retention in the bladder after partial nephrectomy can be observed using CT, although it is relatively rare. It is clinically asymptomatic and disappears spontaneously in most cases.

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Author information

Authors and Affiliations

  1. Department of Radiology, NTT Medical Center Tokyo, 5-9-22, Higashigotanda, Shinagawa-ku, Tokyo, 141-8625, Japan

    Junichi Kazaoka, Masashi Kusakabe & Masaaki Akahane

  2. Department of Radiology, Japanese Red Cross Saitama Hospital, 1-5, Shintoshin, Chuoh-ku, Saitama, 330-8553, Japan

    Junichi Kazaoka

  3. Department of Urology, Tokyo Nephro Urology Center Yamato Hospital, 36-3, Honcho, Itabashi-ku, Tokyo, 173-0001, Japan

    Taro Ottomo

Authors
  1. Junichi Kazaoka
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  2. Masashi Kusakabe
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  3. Taro Ottomo
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  4. Masaaki Akahane
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Corresponding author

Correspondence to Junichi Kazaoka.

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Funding

No funding was received for this study

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in this study were in accordance with the ethical standards of our institutional ethics committee and with the 1964 Helsinki declaration and its later amendments.

Informed consent

For the retrospective nature of this study, written informed consent for individual case was waived under the approval of our institutional review board.

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Kazaoka, J., Kusakabe, M., Ottomo, T. et al. CT detection of fat retention in the bladder after partial nephrectomy. Abdom Radiol 42, 1819–1824 (2017). https://doi.org/10.1007/s00261-017-1117-4

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  • DOI: https://doi.org/10.1007/s00261-017-1117-4

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