Diagnostic CT imaging of the abdomen and pelvis presented in coronal (A), sagittal (B), and axial (C, D) planes, demonstrating complications of peptic ulcer disease. The visual findings include severe edema of the gastric pylorus and duodenum (purple arrow), which has led to significant gastric outlet obstruction. This obstruction is evidenced by a markedly distended stomach containing retained gastric contents (orange arrows). Additionally, there is a localized area of increased soft tissue attenuation with focal gas and central necrosis, indicated by blue arrows, which suggests a contained or walled-off perforation of the duodenal wall. These images highlight the radiological features of complicated duodenal ulcers, including secondary obstructive changes and focal inflammatory masses associated with chronic perforation. This content is suitable for intermediate to advanced medical learners studying gastrointestinal pathology and radiology.

This endoscopic clinical photograph displays a 7 mm cratered ulcer located in the duodenal bulb, a common manifestation of peptic ulcer disease. The ulcer is characterized by a central, depressed crater filled with a brownish-gray fibrinous base and mucus. The surrounding duodenal mucosa is intensely erythematous and edematous, indicating active inflammation (duodenitis). Visible mucosal changes include a granular texture and prominent mucosal folds. Bubbles from gastric secretions are present in the foreground, indicating the fluid-rich environment of the upper gastrointestinal tract. This visual is representative of H. pylori-associated ulceration or NSAID-induced mucosal injury, providing a classic example for gastroenterology and internal medicine education regarding diagnostic upper endoscopy (esophagogastroduodenoscopy) and the morphological evaluation of duodenal lesions.

This diagnostic comparison chart displays four gastroscopic images documenting the healing progression of peptic ulcers. The images are arranged in a 2x2 grid, categorized by anatomical location (antrum of stomach and duodenal bulb) and timeline (start vs. 2 months later). The 'start' images reveal significant mucosal injury: the gastric antrum shows a deep, large ulcer with surrounding mucosal erosions, while the duodenal bulb demonstrates a prominent ulcer with central green slough and erythematous, inflamed surrounding tissue. The '2 months later' images, following treatment with a proton pump inhibitor (omeprazole), illustrate substantial healing. In the gastric antrum, the ulcer has markedly decreased in size with smoothing of the adjacent mucosa. In the duodenal bulb, the ulcer has completely resolved, replaced by a red linear scar and healthy regenerative epithelium. This visual evidence highlights the efficacy of pharmacologic intervention in treating NSAID-related (aspirin-induced) peptic ulcer disease and the capacity for mucosal recovery over a two-month period.

Histopathology image of a gastroenteropancreatic neuroendocrine tumor (gastrinoma) evaluated on hematoxylin and eosin stain. The tumor is composed of uniform nests and cords of neuroendocrine cells embedded in dense fibrous stroma with conspicuous fibrous septa. Cells are polygonal with round to oval nuclei and granular (salt-and-pepper) nuclear chromatin; cytoplasm is moderate to scant, with low mitotic activity. Architectural pattern shows cohesive clusters separated by desmoplastic stroma rather than mucosal nodules with tightly packed trabeculae and acini typical of Type 2 gastrinomas. In this case the desmoplastic reaction may contribute to firm, fibrous tissue surrounding tumor nodules. Immunohistochemistry (not shown) would commonly be positive for chromogranin A and synaptophysin, supporting neuroendocrine differentiation, and gastrin production in clinically suspected Zollinger-Ellison syndrome or MEN1. Clinically, gastrin-secreting tumors cause hypergastrinemia, peptic ulcers, and refractory ulcers; they are part of the MEN1 spectrum. Pathologic differential includes well-differentiated neuroendocrine tumor versus poorly differentiated neuroendocrine carcinoma and pancreatic ductal adenocarcinoma with desmoplasia; architectural and cytologic features favor NET. The image highlights important diagnostic clues: neuroendocrine cytology, uniform cell morphology, nesting patterns, and desmoplastic stroma, guiding clinical correlation and management. This histologic pattern informs prognosis, surgical planning, and consideration of somatostatin receptor-targeted therapies in NETs. Moreover, it guides clinical management.

This diagnostic image is a contrast-enhanced axial (transverse) computed tomography (CT) scan of the upper abdomen. The visualization shows a cross-section of the abdominal cavity with anatomical landmarks including the liver (right), pancreas (central), kidneys (bilateral posterior), and the vertebral body of the spine. Red arrows highlight significant clinical findings: one arrow indicates a hyperenhancing mass located within the pancreatic head, identified as a primary gastrinoma (Zollinger-Ellison syndrome). A second arrow identifies a focal lesion within the hepatic parenchyma, consistent with metastatic disease. The image demonstrates the relationship between primary neuroendocrine tumors and their secondary spread. The surrounding soft tissues, retroperitoneal space, and bowel loops are also visible, providing context for tumor localization and staging. This visual is intended for medical education regarding the diagnostic imaging of pancreatic neuroendocrine tumors and their common metastatic patterns to the liver.