A case of planar-type GIST of the sigmoid colon showing diverticular structure with perforation

Autor: Yuka Shintaku, Yuya Asano, Takahiro Watanabe, Takako Kihara, Eri Ishikawa, Yuan Jiayin, Neinei Kimura, Koji Kinoshita, Seiichi Hirota
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: World Journal of Surgical Oncology, Vol 18, Iss 1, Pp 1-5 (2020)
Druh dokumentu: article
ISSN: 1477-7819
38255243
DOI: 10.1186/s12957-020-01906-8
Popis: Abstract Background Gastrointestinal stromal tumors (GISTs) generally form well-defined mass lesions. However, some cases of the flatly distributed and muscularis propria-replacing GISTs have been reported so far. We experienced an additional case of planar-type GIST of the sigmoid colon accompanied by a diverticulum with perforation. Case presentation A 68-year-old Japanese male with sudden onset of abdominal pain was clinically diagnosed with gastrointestinal perforation, and an emergency abdominal operation was performed. A diverticulum with rupture was found in the sigmoid colon, but no apparent tumor was observed. Histological examination revealed bland spindle cells flatly proliferating and diffusely replacing the muscularis propria at the diverticular structure. The spindle cells were positive for KIT, DOG1, and CD34. Mutational analysis of the c-kit gene revealed that the lesion had a heterozygous deletion of 2 amino acids at codons 557 and 558 of exon 11. The mutation was not observed in the normal mucosa of the surrounding tissue. Conclusion We diagnosed this case as an unusual planar-type GIST. Some similar cases have been reported in the sigmoid colon and other sites. We discuss the mechanism of development of the planar-type GISTs associated with the diverticulum.
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