A case of pancreatic acinar cell carcinoma implantation in multiple branches of the pancreatic duct without main tumor continuity: a rare case report.

Background: Pancreatic acinar cell carcinoma (PACC) is a rare subtype of pancreatic cancer and the clinicopathological behavior of PACC is not yet fully understood. PACC rarely invades the main pancreatic duct (MPD), which causes intraductal growth. Thus, herein, we have reported a rare case of PACC that invaded the MPD and disseminated to the branches of the pancreatic duct (BDs) without exhibiting any continuity with the main tumor.

High-grade biliary intraepithelial neoplasia localized in the distal bile duct diagnosed via peroral cholangioscopy: A rare case report.

Rationale: Biliary intraepithelial neoplasm (BilIN) is characterized by a microscopically identifiable preinvasive neoplasm of the biliary tract. BilIN is rarely diagnosed intentionally and is often detected incidentally in surgical specimens obtained via surgical resection for other types of cancers. Herein, we report a rare case of high-grade BilIN localized in the distal bile duct.

Lymph node metastasis risk factors in T2 colorectal cancer.

Objectives: This study evaluates risk factors for lymph node metastasis (LNM) in T2 colorectal cancer to refine patient selection for endoscopic resection.

Methods: We reviewed records from consecutive patients who had undergone curative surgical resection of T2 colorectal cancer at our institution in Japan between April 2001 and December 2021. Data on conventional clinicopathologic variables were retrieved from the pathology reports at the time of surgery.

Effectiveness and safety of a new clip for delivery using a duodenoscope for bleeding after endoscopic sphincterotomy.

Hemostasis for post-endoscopic sphincterotomy (post-EST) bleeding involves no standard strategy. New clips designed for delivery using the duodenoscope (SureClip, Micro-Tech, Nanjing, China) have been utilized for gastrointestinal bleeding hemostasis and bleeding prevention after polypectomy and papillectomy. We retrospectively analyzed the effectiveness and safety of SureClip for post-EST bleeding.

Estimation of Carleman operator from a univariate time series.

Reconstructing a nonlinear dynamical system from empirical time series is a fundamental task in data-driven analysis. One of the main challenges is the existence of hidden variables; we only have records for some variables, and those for hidden variables are unavailable. In this work, the techniques for Carleman linearization, phase-space embedding, and dynamic mode decomposition are integrated to rebuild an optimal dynamical system from time series for one specific variable.