Gross pathology photograph of a gallbladder specimen showing gangrenous cholecystitis. The organ is enlarged and markedly distended, opened to reveal intraluminal gallstones. The serosal surface is dusky red-brown from congestion and hemorrhage, with transmural inflammation and necrosis evident in the gallbladder wall. The walls are friable and may show edema while the mucosa is disrupted by necrotic debris. External serosa appears thickened and mottled; the lumen contains pigmented bile and debris. Overall, features are consistent with acute calculous cholecystitis complicated by gangrene, with possible early perforation risk. This macroscopic appearance correlates with ischemic injury to the gallbladder wall and extensive inflammatory infiltration. The image illustrates a classic teaching example for gross surgical pathology and hepatobiliary disease. Clinically, gangrenous cholecystitis represents a severe, life-threatening progression from simple cholecystitis, often in patients with comorbidities such as diabetes, cardiovascular disease, and advanced age. The photo supports differential considerations including emphysematous cholecystitis or perforated cholecystitis and emphasizes urgent surgical management and histopathologic confirmation of transmural necrosis. Note the scale is conveyed by a contrasting background and a centimeter ruler present in the image, supporting gross measurements and education. This representation facilitates correlation with surgical findings and guides learning in medical school, pathology residency, and radiology-pathology conferences.

Gross pathology of a gallbladder with acute calculous cholecystitis. The specimen shows a distended, inflamed gallbladder wall with mucosal edema and erythema. The mucosa is congested and irregular, with focal necrosis and yellow-green exudate admixed with fibrinous material. Patchy greenish-yellow pseudomembranes overlying necrotic mucosa are evident, consistent with pseudomembranous cholecystitis. The serosa may be variably irritated, and adherent inflammatory adhesions can be seen along the gallbladder bed. The exterior surface demonstrates hyperemia; the wall may be thickened due to edema. A portion of the lumen is exposed, showing necrotic debris and exudate filling the lumen interface. The 2 cm scale bar provides context for dimensions; overall changes correlate with acute inflammatory insult, often precipitated by gallstone obstruction of the cystic duct. The appearance aligns with fulminant cholecystitis and may precede gangrenous transformation if infection progresses. These macroscopic findings are supported by typical histology of mucosal necrosis, neutrophilic infiltrate, edema, and fibrinous exudate on the surface. This image highlights hallmark features of pseudomembranous cholecystitis with inflammatory exudate forming pseudomembranes, mucosal ulceration, and mural necrosis within the gallbladder wall. Correlation with clinical history of gallstones, fever, RUQ pain, leukocytosis, and imaging findings reinforces diagnosis and guides emergent management for surgical intervention planning.

Gross pathology photograph illustrating gangrenous cholecystitis. The gallbladder is enlarged and distended, with a thickened wall and friable consistency. The serosal surface appears dull and dusky red‑brown, reflecting profound congestion and ischemia. Depressed necrotic foci are present on the mucosal and serosal surfaces, consistent with transmural necrosis typical of gallbladder gangrene. The organ shows irregular, hemorrhagic, devitalized areas interspersed with relatively preserved tissue. Exterior faces mild edema with focal surface ulcers at the fundus and body. The lumen contents are not visible in this specimen, as processing often removes bile. This macroscopic image was captured from an excised gallbladder to illustrate severe inflammatory biliary disease in surgical pathology. The blue background and centimeter scale provide reference for size and orientation. Imaging technique includes gross pathology photography, color‑calibrated macro imaging, and high‑resolution digital capture under standardized lighting. Diagnostic significance lies in confirming advanced gallbladder necrosis with gangrene, which elevates risk of perforation, peritonitis, and sepsis; it supports a clinical diagnosis of acute gangrenous cholecystitis. Educationally, this image aids recognition of gross features, correlates with clinical presentation, and enhances training in surgical pathology interpretation. This image is suitable for medical students, residents, and fellows studying gallbladder pathology, inflammatory hepatobiliary disease, and surgical specimen assessment.

This image depicts a high-magnification light microscopy view of gallbladder wall in a case of gangrenous cholecystitis. Prepared from routine formalin-fixed paraffin-embedded tissue and stained with Hematoxylin and Eosin, the specimen is examined at high power to highlight cellular detail. In the left half, a pseudosarcomatous myofibroblastic proliferation is evident: plump spindle-shaped cells with elongated, hyperchromatic nuclei arranged in short fascicles within a loose myxoid-to-fibrous stroma, admixed inflammatory cells, and areas of necrosis consistent with gangrenous change. The right half shows more densely packed inflammatory infiltrates and vascular congestion with surrounding edema. The overall pattern can simulate a high-grade sarcoma when taken out of context, owing to marked nuclear atypia in a myofibroblastic component. Clinically, this histology corresponds to severe gallbladder inflammation with tissue destruction rather than a primary mesenchymal neoplasm. Diagnostic significance lies in recognizing a reactive, post-inflammatory pseudosarcomatous pattern to avoid overcalling sarcoma; ancillary studies, including immunohistochemistry for smooth muscle actin and desmin, and correlation with gross pathology, aid confirmation. This image is relevant for surgical pathology education, differential diagnosis of spindle cell proliferations, and radiologic-pathologic correlation in biliary disease. It informs differential diagnoses: inflammatory myofibroblastic reaction vs sarcoma; guides management.