title: [A Case of Pelvic Schwannoma, Mimicking Metastasis of Rectal Carcinoma].
abstract: BACKGROUND
  Schwannoma in the lateral lymph node region is extremely rare; however, this tumor has been reported to have relatively high SUV on PET-CT, suggestive of malignancy.
  
  
  METHODS
  A 67-year-old man with advanced lower rectal cancer had a small nodule with FDG accumulation (SUVmax 2.6) near the left internal iliac artery. His preoperative diagnosis was rectal cancer with lateral lymph node metastasis. He underwent super-low anterior resection with lateral lymph node dissection. Histopathological examination was conclusive for pT3 (A), with an Rt263D lymph node metastasis. Interestingly, a schwannoma was detected among the harvested lymph nodes.
  
  
  CONCLUSIONS
  Although rectal cancer is known to involve pelvic lymph nodes, the role of preoperative diagnosis with FDG-PET is unclear. We should consider that schwannoma is associated with slight elevation of SUVmax and it may mimic lymph node metastasis.
authors.affiliation: Dept. of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Baba
authors.forename: Takeaki
authors.initials: T
authors.lastname: Matsuzawa
authors.forename: Minoru
authors.initials: M
authors.lastname: Fukuchi
authors.forename: Youichi
authors.initials: Y
authors.lastname: Kumagai
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Ishibashi
authors.forename: Erito
authors.initials: E
authors.lastname: Mochiki
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Ishida
mesh_terms: D000230:Adenocarcinoma / Q000601:surgery; D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D008197:Lymph Node Excision; D008198:Lymph Nodes / Q000473:pathology*; D008207:Lymphatic Metastasis; D008297:Male; D009442:Neurilemmoma / Q000175:diagnosis* / Q000601:surgery; D011379:Prognosis; D012004:Rectal Neoplasms / Q000473:pathology* / Q000601:surgery