Pancreaticoduodenal Artery Aneurysm Rupture Presenting as Duodenal Obstruction Successfully Treated with Early Transcatheter Arterial Embolization: A Case Report of Suspected Segmental Arterial Mediolysis.

Visceral aneurysms are a rare but important form of abdominal vascular disease. Rupture of the aneurysms leads to serious symptoms, such as acute abdomen or abdominal bleeding. However, duodenal obstruction due to arterial rupture of an aneurysm is very rare. We herein report a 50-year-old woman with suspected segmental arterial mediolysis (SAM) who was first diagnosed with acute abdomen and duodenal obstruction. Rupture of a pancreaticoduodenal artery aneurysm was confirmed, and she was treated with transcatheter arterial embolization. In cases of acute abdomen, SAM is a rare but important possibility to consider as a differential diagnosis.

Spontaneous regression of a rectal tonsil presenting as a large submucosal tumor.

Rectal tonsils are localized hyperplastic lymphoid tissues in the rectum, and the initial endoscopic findings are consistent with those for neoplastic lesions. However, rectal tonsils are benign entities, and the diagnosis should be made cautiously. A 70-year-old man presented with pain on defecation with rectal bleeding. Colonoscopy revealed a 3-cm protruding mass in the rectum with mucosal erosion, but no malignant features were observed on forceps biopsy. Endoscopic ultrasonography (EUS) showed that the lesion was a hypoechoic mass without blood flow. Fine needle aspiration under EUS revealed no malignant components, although the size of the lesion had shrunk, and symptoms, such as blood-stained stool, tenesmus, and discomfort during defecation, had resolved. A second forceps biopsy showed intermediate-sized lymphocytes without lymphoepithelial lesions. Based on immunostaining, the lesion was diagnosed as a rectal tonsil. Rectal tonsils occur due to localized proliferation of reactive lymphoid follicles in the submucosa or muscularis mucosa. However, endoscopic diagnosis is difficult since less invasive treatment is performed for neoplastic lesions of the rectum to preserve the function of the anal sphincter. Diagnosis and treatment of small lesions might be possible by endoscopic resection; however, for relatively large lesions, formulating a diagnosis based only on biopsy specimens becomes even more difficult. Therefore, repeated biopsies might be helpful for the diagnosis of rectal tonsils and for excluding other neoplasms.

Familial spread of a virulent clone of Klebsiella pneumoniae causing primary liver abscess.

Capsule-forming Klebsiella pneumoniae K1 caused primary liver abscess in two household members of a family. The causative isolates had identical pulsed-field gel electrophoresis patterns and were determined to be sequence type 23. An additional member of the family was found to carry the same strain without clinical manifestation.

A case of penetration of the intestinal wall by a soft-shelled turtle bone successfully removed with double-balloon endoscopy.

A 62-year-old male was admitted to our hospital due to left lower abdominal pain. Three days before admission, he ate seafood in a Japanese restaurant. Two days before admission, he suffered from intermittent left lower abdominal pain. One day before admission, he developed a high fever and subsequently visited our hospital the following day. Localized tenderness and rebound pain were observed in the left lower abdomen, and C-reactive protein was elevated. Computed tomography revealed a linear high-density object in the distal portion of the small intestine accompanied by edema of the wall, suggesting penetration by something like a fishbone. On the ninth hospital day, double-balloon endoscopy was performed via the transanal route. Yellow foreign material was found in the ileum and was then successfully removed with biopsy forceps. The removed material measured 3 mm in width, 3 cm in length and was slightly curved. It proved to be a bone of the forefoot of a soft-shelled turtle, which had been included on the menu of the restaurant. The patient was completely cured and discharged on the 14th hospital day.

A case of a duodenal gastrointestinal stromal tumor diagnosed with the aid of diffusion-weighted magnetic resonance imaging.

Gastrointestinal stromal tumors (GISTs) are the most common mesenchymal tumor of gastrointestinal tract, and bleeding is among the primary symptoms. If the tumor is located in the small intestine, diagnosis might be difficult because of its inaccessibility by endoscope. This report presents a case of duodenal GIST diagnosed with the aid of diffusion-weighted (DW) magnetic resonance imaging (MRI). A 66-year-old male was admitted to the hospital because of shortness of breath and melena. The patient demonstrated marked anemia. Esophagogastroduodenoscopy and colonoscopy revealed no involvement of the mucosa of the gastrointestinal tract in regard to the observed bleeding. Thereafter, computed tomography was done and showed a tumorous lesion 4.2 cm in diameter located around the ligament of Treitz. The area showed significant high intensity by DW-MRI, strongly suggesting malignant character. Examination with a long endoscope demonstrated a large submucosal tumor with wide ulceration located at the third portion of the duodenum. The biopsy sample contained spindle-shaped cells that were positive for CD34 and c-kit on histochemistry, and the tumor was diagnosed as GIST. The patient underwent surgery and survived for 16 months without any recurrence.