title: Natural history of superficial depressed colorectal cancer: retrospective radiographic and histologic analysis.
abstract: OBJECTIVE
  To characterize the growth and developmental changes of superficial depressed colon cancer by using retrospective radiographic and histologic data.
  
  
  METHODS
  In a retrospective study, the radiographs in patients with nine superficial depressed and those with 12 elevated (sessile or semipedunculated) colon cancers were analyzed.
  
  
  RESULTS
  The initial superficial depressed lesions were 11.7 mm (mean) in diameter and took an average of 32.3 months to double in size. The initial elevated lesions were 15.7 mm (mean) in diameter and took an average of 8.6 months to double in size. The initial size of the former was not statistically significantly different from that of the latter; however, the doubling time of the superficial depressed cancers was statistically significantly slower than that of the elevated cancers. Superficial depressed cancers did not have concomitant adenomatous components, did not develop rapidly into advanced cancer, and did not change greatly from their original configuration; their growth rate was rather slow. Histologically, superficial depressed cancers showed a nonpolypoid growth pattern.
  
  
  CONCLUSIONS
  Superficial depressed cancer develops more slowly than does elevated cancer, and this development follows a nonpolypoid growth pattern.
authors.affiliation: Department of Gastroenterology, Fukuoka University Chikushi Hospital, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Matsui
authors.forename: T
authors.initials: T
authors.lastname: Yao
authors.forename: K
authors.initials: K
authors.lastname: Yao
authors.forename: K
authors.initials: K
authors.lastname: Takenaka
authors.forename: T
authors.initials: T
authors.lastname: Sakurai
authors.forename: A
authors.initials: A
authors.lastname: Iwashita
authors.forename: T
authors.initials: T
authors.lastname: Fuchigami
authors.forename: K
authors.initials: K
authors.lastname: Aoyagi
authors.forename: H
authors.initials: H
authors.lastname: Date
mesh_terms: D000230:Adenocarcinoma / Q000000981:diagnostic imaging* / Q000473:pathology*; D000368:Aged; D001466:Barium Sulfate; D003106:Colon / Q000000981:diagnostic imaging / Q000473:pathology; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology*; D003287:Contrast Media; D005260:Female; D006801:Humans; D008297:Male; D009361:Neoplasm Invasiveness; D011859:Radiography; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology*; D012007:Rectum / Q000000981:diagnostic imaging / Q000473:pathology; D012189:Retrospective Studies; D013997:Time Factors
chemical_list: D003287:Contrast Media; D001466:Barium Sulfate