The hepatic veno-occlusive diseases are a heterogeneous group of circulatory disorders characterized by obstruction of hepatic venous outflow at the sinusoidal or postsinusoidal levels. These disorders uniquely manifest portal hypertension…
Etiology Fatty liver is a generic term that refers to the accumulation of lipids within hepatocytes. This chapter focuses on nonalcoholic fatty liver disease (NAFLD), the most common form of…
Etiology Hepatic iron overload is a generic term that refers to the nonphysiologic accumulation of iron within the hepatic parenchyma. The most clinically significant cause of hepatic iron overload is…
Etiology Although benign hepatic tumors have been classified into several histiotypes according to their cell of origin (i.e., hepatocytes, biliary epithelium, or mesenchymal cells), our focus in this discussion is…
Etiology Malignant liver tumors can be classified either by cell of origin as hepatocellular, cholangiocellular, or mesenchymal or by site of origin as primary or secondary. This chapter will describe…
The hepatic storage disorders are genetic conditions characterized by the accumulation of toxic substances within either hepatocytes or the hepatic extracellular matrix. This deposition causes secondary tissue damage, which may…
Etiology Vascular lesions of the colon are an important medical problem and have now been recognized as a significant cause of gastrointestinal bleeding. They can be solitary or multifocal, benign…
Etiology The causes of the development of colorectal carcinoma and its precursor lesion, the colonic adenoma, are multifactorial and include both genetic predisposition and environmental insults. Risk factors for colorectal…
Conventional Imaging Technical Aspects Before cross-sectional imaging, the double-contrast enema was the foremost radiologic method for detection of colonic mucosal lesions and precancerous polyps. Diagnostic high-quality double-contrast barium enema examination…
Etiology Colonic inflammation may be caused by numerous processes and is typically thought of as colitis. Some inflammatory conditions of the colon such as diverticulitis and epiploic appendagitis also represent…
