"Cat scratch colon" is a gross finding characterized by hemorrhagic mucosal scratches on colonoscopy. It is usually associated with a normal colon and is rarely associated with collagenous colitis. In a previous report, cat scratch colon was noted in the cecum and ascending colon, but has also been observed in the distal transverse colon. The patient in this study was also diagnosed with ischemic colitis that may have played a role in the development of cat scratch colon.

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• “Cat scratch colon” causing cecal perforation as a rare complication due to barotrauma during colonoscopy: A case report and literature review
  Hitoshi Hara, Yasuhide Muto, Tomoki Kido, Ryohei Miyata, Moe Tokuda, Tomohiro Maesono, Takahiro Ajihara, Takuma Naritomi, Michio Itabashi
  DEN Open.2026;[Epub]     CrossRef
• Cat Scratch Colon: A Case Report and Review of the Literature
  Tareq Alsaleh, Swotantra Gautam, Nouman Shafique, Prachi Mann, Eduardo Lorenzo, Baha Aldeen Bani Fawwaz, Abu Hurairah
  Cureus.2025;[Epub]     CrossRef
• An unexpected finding of cat scratch colon in a screening colonoscopy
  Natalia Mora Cuadrado, Noelia Alcaide Suárez, Beatriz Antolín Melero, Beatriz Burgueño Gómez, Miguel Durà Gil, Luis Ignacio Fernández Salazar, José Manuel González Hernández
  Gastroenterología y Hepatología (English Edition).2019; 42(3): 172.     CrossRef
• Hallazgo inesperado de colon en arañazo de gato en una colonoscopia de cribado
  Natalia Mora Cuadrado, Noelia Alcaide Suárez, Beatriz Antolín Melero, Beatriz Burgueño Gómez, Miguel Durà Gil, Luis Ignacio Fernández Salazar, José Manuel González Hernández
  Gastroenterología y Hepatología.2019; 42(3): 172.     CrossRef

Primary fallopian tube carcinoma (PFTC) is a rare gynecological cancer that is very difficult to diagnose preoperatively. Here, we report the case of a 66-year-old female patient with PFTC that was diagnosed preoperatively on the basis of the characteristic features on endoscopic ultrasound (EUS) elastography and fine needle biopsy (FNB). EUS showed a sausage-shaped hypoechoic mass, 8 cm in size, with irregular margins and heterogeneous internal echoes extending to both adnexa. EUS elastography revealed that the mass had a blue color pattern, representing hard stiffness, and a heterogeneous green/red color pattern distributed outside the tumor, representing intermediate stiffness. Histopathologic analysis of the FNB and operative specimens confirmed the diagnosis of fallopian tube carcinoma. This is the first reported case of a combined EUS elastography and FNB of an adnexal mass leading to a preoperative diagnosis of fallopian tube carcinoma.

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• The clinical impact of ultrasound contrast agents in EUS: a systematic review according to the levels of evidence
  Pietro Fusaroli, Bertrand Napoleon, Rodica Gincul, Christine Lefort, Laurent Palazzo, Maxime Palazzo, Masayuki Kitano, Kosuke Minaga, Giancarlo Caletti, Andrea Lisotti
  Gastrointestinal Endoscopy.2016; 84(4): 587.     CrossRef

Metastatic mucinous adenocarcinoma of appendix origin and mimicking a gastric subepithelial tumor (SET) is very rare. Endoscopic ultrasound (EUS)-guided sampling is a useful diagnostic method for SETs. However, the cytologic findings of metastatic mucinous adenocarcinoma are unfamiliar to many pathologists and gastroenterologists. These findings present a diagnostic challenge because the introduction of gastric epithelium and mucin into the specimen during the procedure can be misleading. This is the first reported experience of an EUS-guided sampling of a gastric SET in a patient with suspected appendiceal tumor, to make the diagnosis of a mucinous adenocarcinoma.

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• A Case of Transduodenal Endoscopic Ultrasound-Guided Biopsy of an Appendiceal Lesion
  Nihal Ijaz Khan, Abdullah Abbasi, Saurabh Chandan, Sagar Pathak, Charanjeet Singh, Muhammad K. Hasan
  ACG Case Reports Journal.2024; 11(12): e01574.     CrossRef