Abstract
Background
Pseudomyxoma peritonei (PMP) is a rare locoregional disease characterized by disseminated intraperitoneal mucinous tumors. However, little is known about PMP from urachal neoplasm as a result of its rarity.
Methods
A total of 9 patients with PMP of urachal origin were treated by cytoreductive surgery (CRS) plus hyperthermic intraperitoneal chemotherapy (HIPEC) in our institution. All specimens of surgeries were submitted for pathologic examination. Representative slides of tumors and normal urachus were submitted for immunohistochemical staining.
Results
Four patients were men; the median age was 48 years (range 27–65 years). Initial radiologic examination of all patients showed a cystic tumor located between posterior aspect of umbilicus and the dome of urinary bladder, with or without leaking mucin. Complete CRS and HIPEC were performed in all patients. Until the latest follow-up, local recurrence occurred in 1 patient. Other 8 patients had a median disease-free survival of 27.5 months. Primary urachal tumors of 9 cases were all mucinous adenocarcinoma. Six patients had low-grade mucinous carcinoma peritonei, and 3 patients had high-grade mucinous carcinoma peritonei. Signet ring cells were noted in 4 patients. All tumor specimens of 9 patients were diffuse positive for CK-20, CDX-2, MUC-2, and MUC-5AC, and were variant positive for CK-7.
Conclusions
PMP arising from urachus comes from neoplastic cells with development of intestinal-type mucinous neoplasm. It shares a similar pathophysiology as PMP from appendix. CRS including total urethrectomy, partial cystectomy, and peritonectomy plus HIPEC can be considered as a new option of treatment for PMP originating from urachus.
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DISCLOSURE
Yang Liu, Haruaki Ishibashi, Masamitsu Hirano, Kazuyoshi Takeshita, Akiyoshi Mizumoto, Masumi Ichinose, Eisei Nishino, Ippei Kashu, Yoshihiro Yamamoto, Paul H. Sugarbaker, Yutaka Yonemura there is no conflict of interest to disclose.
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Supplementary Fig. 1
immunohistochemical staining results of mucinous tumor in patients with pseudomyxoma peritoneifrom urachus. (a) CDX2, (b) CK7, (c) CK20, (d) MUC2, (e) MUC5AC, (f) Ki-67 (TIFF 4658 kb)
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Liu, Y., Ishibashi, H., Hirano, M. et al. Cytoreductive Surgery Plus Hyperthermic Intraperitoneal Chemotherapy for Pseudomyxoma Peritonei Arising from Urachus. Ann Surg Oncol 22, 2799–2805 (2015). https://doi.org/10.1245/s10434-014-4336-8
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DOI: https://doi.org/10.1245/s10434-014-4336-8