Light-microscopy histology of liver tissue demonstrates macrovesicular steatosis. Imaging modality: Histology using Hematoxylin and Eosin (H&E) stain on paraffin-embedded sections. Anatomical localization: hepatic parenchyma of the liver, with hepatocytes arranged in plates separated by sinusoids and preserved lobular architecture visible at low magnification. Visual features: numerous intracellular lipid vacuoles produce large clear droplets that displace hepatocyte nuclei to the periphery; cytoplasm otherwise eosinophilic; occasional subtle ballooning is not evident; portal tracts and central veins are discernible but not markedly inflamed. Pathological interpretation: macrovesicular steatosis consistent with fatty liver changes; most compatible with nonalcoholic fatty liver disease (NAFLD) or alcoholic fatty liver disease (AFLD) depending on patient history. In this image, steatosis is the predominant finding with minimal inflammatory infiltrate and no definitive fibrosis at this level of magnification. Clinical significance: fatty change indicates hepatocellular stress from metabolic syndrome or hepatotoxic exposure; may precede steatohepatitis, fibrosis, cirrhosis, and increased risk of hepatocellular carcinoma with ongoing injury. Potential clinical use cases: assessment of steatosis burden in NAFLD/NASH studies, biopsy-guided staging, therapeutic monitoring, and education for trainees. The image serves as an educational reference for recognizing hepatocellular lipid accumulation and distinguishing it from other hepatic pathologies such as steatohepatitis and cholestatic injury.

This medical infographic illustrates the pathophysiology and progression of liver disease from Nonalcoholic Fatty Liver Disease/Nonalcoholic Steatohepatitis (NAFLD/NASH) to Hepatocellular Carcinoma (HCC). The upper portion features two diagnostic CT images: an axial section of a liver with NAFLD/NASH showing diffuse decreased attenuation (steatosis) and a coronal section demonstrating HCC with multiple heterogeneously enhancing masses distorting the hepatic contour. Below the imaging, horizontal bars and arrows correlate clinical progression with underlying molecular and environmental drivers. Key factors identified include genetic predispositions (PNPLA3, HSD17B13), the increasing influence of obesity and metabolic syndrome, and escalating levels of apoptosis, immune response, and inflammation. The diagram also highlights the role of the gut-liver axis, specifically Small Intestinal Bacterial Overgrowth (SIBO) and Lipopolysaccharides (LPS), with a potential therapeutic intersection for antibiotics. The graphic serves as a summary of hepatocarcinogenesis in the context of metabolic dysfunction-associated liver disease.

This pathophysiology diagram illustrates the metabolic cross-talk between the gut microbiota and the development of nonalcoholic fatty liver disease (NAFLD). At the top, a 'Healthy liver' depicted in red transitions via an arrow towards a yellow-colored liver labeled 'NAFLD,' signifying steatosis. This progression is influenced by genetic, epigenetic, and environmental factors. Centrally, a 'Gut microbiota' icon radiates arrows toward various metabolites and microbial compounds categorized by colored boxes. These include amino acids (BCAAs and AAs), bile acids (deoxycholic acid), microbial products (LPS, DNAs), dietary fibers, short-chain fatty acids (SCFAs like acetate, propionate, and butyrate), ethanol (specifically mentioning Klebsiella pneumoniae), and choline/trimethylamine. A red bracket connects these metabolic influences to the core transition arrow labeled 'Metabolism,' highlighting how gut-derived signals modulate liver health and the progression toward NAFLD and potentially nonalcoholic steatohepatitis (NASH). This educational infographic is designed to explain the biochemical pathways and systemic interactions involved in metabolic liver disease.

Alcoholic steatohepatitis manifested on liver biopsy as macrovesicular steatosis with hepatocellular injury, inflammatory infiltrates, and early fibrosis. This bright-field histology image, obtained from a paraffin-embedded liver biopsy and stained with Hematoxylin and Eosin, highlights lobular and portal changes. Large fat vacuoles displace hepatocyte nuclei; scattered ballooning degeneration accompanies hepatocellular damage. In the portal tracts, mixed inflammatory cells—neutrophils and lymphocytes including CD4+ and CD8+ T cells—are evident, often forming a neutrophilic infiltrate around ductular structures. A ductular reaction is visible as proliferating biliary-like cells at the limiting plate and portal-periportal interface. The surrounding parenchyma shows cytoplasmic rarefaction and mild-to-moderate inflammation, with early fibrotic bands encroaching on the portal triad region. Collectively, these features support an active alcoholic injury pattern rather than pure steatosis, differentiating from nonalcoholic fatty liver disease. Clinically, this image underpins diagnoses of alcoholic hepatitis/ASH in the appropriate history and contributes to assessments of disease activity and prognosis via fibrosis staging. It is relevant for medical education, histopathology libraries, and research on inflammatory liver diseases, fibrosis progression, and the hepatobiliary response to alcohol exposure. This image supports differential diagnosis with NAFLD, alcoholic hepatitis, DILI; useful for pathology education, case conferences, radiology-pathology correlation, and AI dataset curation, and clinical teaching.