1
|
Aoyama S, Inoue A, Kagawa Y, Komori T, Ozato Y, Nishizawa Y, Sugimoto T, Komatsu H, Hirota M, Miyazaki Y, Tomokuni A, Motoori M, Fushimi H, Yamamoto G, Akagi K, Iwase K, Fujitani K. Curative resection via right hemicolectomy and regional lymph node dissection for colonic adenomatous polyposis of unknown etiology with adenocarcinomas localized in the right side of the colon: a case report. Surg Case Rep 2024; 10:93. [PMID: 38647838 PMCID: PMC11035501 DOI: 10.1186/s40792-024-01890-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 04/05/2024] [Indexed: 04/25/2024] Open
Abstract
BACKGROUND APC and MUTYH are both well-known colorectal polyposis causative genes. However, 30-50% of colorectal adenomatous polyposis cases are classified as colonic adenomatous polyposis of unknown etiology and lack identifiable pathogenic variants. Although guidelines recommend total proctocolectomy for colonic adenomatous polyposis of unknown etiology with over 100 adenomas, evidence is lacking. This study presents a unique case of localized colonic adenomatous polyposis of unknown etiology with multiple adenocarcinomas, treated with hemicolectomy and regional lymph node dissection. CASE PRESENTATION The patient was a 72-year-old woman whose colonoscopy revealed numerous polyps and two adenocarcinomas localized in the right side of the colon, with no lesions in the left side. The patient had no family history of polyposis or colorectal cancer. No extracolonic lesions, enlarged lymph nodes, or distant metastases were found. Considering the patient's age and lesion localization, laparoscopic right hemicolectomy with regional lymph node dissection was performed. Histopathological diagnosis revealed three adenocarcinoma lesions with no lymph node metastasis. The most advanced pathological stage was T2N0M0 Stage I (UICC 8th edition). The patient was alive 5 years postoperatively, without recurrence of cancer or polyposis in the remaining colon and rectum. To diagnose hereditary colorectal cancer/polyposis, a germline multigene panel testing for APC, EPCAM, MBD4, MLH1, MLH3, MSH2, MSH3, MSH6, MUTYH, NTHL1, PMS2, POLD1, POLE, and TP53 was performed using DNA extracted from blood samples: however, no pathogenic variant was detected. Therefore, the patient was diagnosed with colonic adenomatous polyposis of unknown etiology. CONCLUSIONS In this rare case, colonic adenomatous polyposis of unknown etiology, with numerous adenomatous polyps and multiple adenocarcinomas localized in the right side of the colon, was successfully treated with right hemicolectomy and regional lymph node dissection. Despite genetic analysis, no causative germline variants were identified. Segmental colectomy according to the distribution of polyps might be a curative approach.
Collapse
Affiliation(s)
- Shu Aoyama
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Akira Inoue
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan.
| | - Yoshinori Kagawa
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Takamichi Komori
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
- Department of Surgery, Hyogo Prefectural Nishinomiya Hospital, Nishinomiya, Japan
| | - Yuki Ozato
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Yujiro Nishizawa
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Tomoki Sugimoto
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Hisateru Komatsu
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Masashi Hirota
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Yasuhiro Miyazaki
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Akira Tomokuni
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Masaaki Motoori
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Hiroaki Fushimi
- Department of Pathology, Osaka General Medical Center, Osaka, Japan
| | - Gou Yamamoto
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Kitaadachi-gun, Japan
| | - Kiwamu Akagi
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Kitaadachi-gun, Japan
| | - Kazuhiro Iwase
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| | - Kazumasa Fujitani
- Department of Gastroenterological Surgery, Osaka General Medical Center, 3-1-56 Bandaihigashi, Sumiyoshi-Ku, Osaka, Japan
| |
Collapse
|