Difference between revisions of "Drug-induced liver disease"

Hemochromatosis with DILI canalicular cholestasis with mild hepatocyte injury in the form of regeneration. This young adult man presented with jaundice; canalicular cholestasis was explicable on the basis of one or more of the medications he had been given. Iron positivity came as a surprise.  Canalicular cholestasis, accumulation of bile in canaliculi, and, at times, choangioles, is most commonly seen with steroids. When damage to hepatocytes & portal inflammation accompanies canalicular cholestasis, drugs such as chlorpromazine and erythromycin, are most often responsible. Pure ductular cholestasis has been associated with benoxaprofen or sepsis. Cholangiodestructive (e.g., with destroyed bile ducts) cholestasis has been associated with paraquat, chlorpromazye, and other drugs. Some drugs, eg, phenytoin are also noted to be associated with mixed hepatocellular/cholestatic injury.  Others have bile duct proliferation with eosinophils as a response.[1]<br>Present at low power are seemingly normal portal triads [black arrows], normal central veins [green arrows] and normal intervening parenchyma (Row 1 Left 40X). Iron stain shows 3+ iron deposition (Row 1 Right 40X). A reticulin stain shows changes of injury. Lines between portal triad [black arrow] and central vein [green arrow] lack directionality. Regeneration is seen in two-three hepatocyte cords [blue arrows] and hepatocyte rosettes [magenta arrows]; canaliculi are not highlighted by reticulin stain. (Row 2 Left 100X). Iron stain shows predominantly hepatocellular iron deposition [green arrows] with occasional Kupffer cell staining [black arrows] (Row 2 Right 400X). Distinguishing iron from bile can be accomplished by evaluating location of pigment. In pure canalicular cholestasis with mild hepatocyte injury, unusual are macrophages with bile staining in the lobule, being as they are confined to the sinusoids; the pigment on left on H&E in a sinusoidal macrophage [green arrow], stains blue on iron stain on similar macrophage [black arrow] (Row 3 Left 400X). Note the canalicular pigment on left on HE, [green arrows] ; a similar ball on the iron stain on the right lacks any stain [black arrow] (Row 3 Right 400X).<br>[1]H.J. Zimmerman, KG Ishak, “Hepatic injury due to drugs and toxins.” In Pathology of the Liver. RNM MacSween, et al, eds. New York: Churchill-Livingston. 2002: 638-641.