title: Granulocytic sarcoma of bowel: CT findings.
abstract: OBJECTIVE
  To evaluate retrospectively the computed tomographic (CT) findings of granulocytic sarcoma of the bowel.
  
  
  METHODS
  The institutional review boards of all participating institutions approved this study and waived the requirement for informed consent. CT scans were retrospectively reviewed in eight patients (seven men, one woman; age range, 23-71 years; mean age, 46 years) with pathologically proved granulocytic sarcoma of the small and/or large bowel. CT findings were evaluated with regard to the sites, morphologic characteristics, and contrast material enhancement patterns of the lesions, along with other ancillary findings (ie, peritoneal and mesenteric infiltration, ascites, lymphadenopathy, bowel perforation, and obstruction).
  
  
  RESULTS
  Eight patients had a total of 13 lesions in the bowel (of which eight were pathologically proved), involving the duodenum (n=1), jejunum (n=2), ileum (n=5), sigmoid colon (n=1), and rectum (n=4); multifocal bowel lesions were noted in four patients. The lesion varied in shape, with wall thickening alone in three of 13 lesions, an intraluminal polypoid mass in four, an exophytic mass in one, and a combination of findings in five. Contrast material enhancement, relative to the back musculature, showed isoattenuation in seven lesions, hyperattenuation in four, and hypoattenuation in two. Five of eight patients had multiple peritoneal masses with diffuse mesenteric or peritoneal infiltration. Ascites was present in six of eight patients; lymphadenopathy (especially in the mesentery), in five; bowel perforation, in two; and bowel obstruction, in one.
  
  
  CONCLUSIONS
  Granulocytic sarcoma of the bowel is characterized by variability in shape and contrast enhancement and has a high predilection for mesenteric and peritoneal spread.
authors: Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 388-1 Pungnap-2 Dong, Songpa-gu, Seoul 138-736, Korea.
authors: Eugene K
authors: EK
authors: Choi
authors: Hyun Kwon
authors: HK
authors: Ha
authors: Seong Ho
authors: SH
authors: Park
authors: Soon Jin
authors: SJ
authors: Lee
authors: Seung Eun
authors: SE
authors: Jung
authors: Kyoung Won
authors: KW
authors: Kim
authors: Seung Soo
authors: SS
authors: Lee
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007414:Intestinal Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D008643:Mesentery / Q000000981:diagnostic imaging*; D008875:Middle Aged; D010534:Peritoneal Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary*; D015203:Reproducibility of Results; D012189:Retrospective Studies; D023981:Sarcoma, Myeloid / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*