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Peer-reviewedCC BYCase reports in urology

Hybrid Open and Robot-Assisted Excision of a Giant Multilocular Prostatic Cystadenoma With Unusual Dorsal Growth: A Case Report.

  • Toshiki Kenuka1
  • Yuki Kyoda1
  • Manabu Okada2
  • Fumiyasu Takei3
  • Tetsuya Shindo1
  • Kohei Hashimoto1
  • Ko Kobayashi1
  • Toshiaki Tanaka1
  • Reiko Watanabe4
  • Naoya Masumori1
4 affiliations
  1. 1Department of Urology School of Medicine Sapporo Medical University Sapporo Japan sapmed.ac.jp.
  2. 2Department of Urology Hokkaido Social Work Association Obihiro Hospital Obihiro Japan dlut.edu.cn.
  3. 3Tokachi Urological Clinic Otofuke Japan.
  4. 4Department of Surgical Pathology School of Medicine Sapporo Medical University Sapporo Japan sapmed.ac.jp.
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Abstract

Large prostatic tumors are rare conditions that may present with atypical morphology on imaging studies and can pose substantial challenges in preoperative diagnosis. We encountered a case of giant multilocular prostatic cystadenoma (GMPC) with dorsal growth in which malignancy could not be excluded despite multiple biopsies demonstrating stromal hyperplasia. A 71-year-old man presented with lower abdominal pain associated with defecation, and imaging revealed a large pelvic mass with increased uptake on positron emission tomography. Because malignancy could not be excluded, radical prostatectomy was performed. The procedure was initiated robotically but required conversion to an open approach due to intraoperative difficulty. Histopathological examination of the 500-g resected mass revealed stromal hyperplasia with multilocular cystic architecture, consistent with GMPC. Postoperatively, urinary function remained satisfactory, and no recurrence has been observed to date. This case highlights the diagnostic challenges associated with GMPC presenting with atypical growth patterns and demonstrates that complete excision is feasible with an appropriate surgical approach.

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Cite

BibTeXRIS
BibTeX
@article{kenuka2026hybrid,
  title = {{Hybrid Open and Robot-Assisted Excision of a Giant Multilocular Prostatic Cystadenoma With Unusual Dorsal Growth: A Case Report.}},
  author = {Toshiki Kenuka and Yuki Kyoda and Manabu Okada and Fumiyasu Takei and Tetsuya Shindo and Kohei Hashimoto and Ko Kobayashi and Toshiaki Tanaka and Reiko Watanabe and Naoya Masumori},
  journal = {Case reports in urology},
  year = {2026},
  month = oct,
  doi = {10.1155/criu/5630511},
  url = {https://europepmc.org/article/MED/42959211},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Hybrid Open and Robot-Assisted Excision of a Giant Multilocular Prostatic Cystadenoma With Unusual Dorsal Growth: A Case Report.
AU  - Toshiki Kenuka
AU  - Yuki Kyoda
AU  - Manabu Okada
AU  - Fumiyasu Takei
AU  - Tetsuya Shindo
AU  - Kohei Hashimoto
AU  - Ko Kobayashi
AU  - Toshiaki Tanaka
AU  - Reiko Watanabe
AU  - Naoya Masumori
PY  - 2026
DA  - 2026/10/28
JO  - Case reports in urology
DO  - 10.1155/criu/5630511
UR  - https://europepmc.org/article/MED/42959211
AB  - Large prostatic tumors are rare conditions that may present with atypical morphology on imaging studies and can pose substantial challenges in preoperative diagnosis. We encountered a case of giant multilocular prostatic cystadenoma (GMPC) with dorsal growth in which malignancy could not be excluded despite multiple biopsies demonstrating stromal hyperplasia. A 71-year-old man presented with lower abdominal pain associated with defecation, and imaging revealed a large pelvic mass with increased uptake on positron emission tomography. Because malignancy could not be excluded, radical prostatectomy was performed. The procedure was initiated robotically but required conversion to an open approach due to intraoperative difficulty. Histopathological examination of the 500-g resected mass revealed stromal hyperplasia with multilocular cystic architecture, consistent with GMPC. Postoperatively, urinary function remained satisfactory, and no recurrence has been observed to date. This case highlights the diagnostic challenges associated with GMPC presenting with atypical growth patterns and demonstrates that complete excision is feasible with an appropriate surgical approach.
SN  - 2090-696X
SN  - 2090-6978
ER  -