Accessory lobe of the liver in Gunn‐derived rats

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Abstract
Congenital accessory lobe of the liver in rats is described. The defect may be an inherited one, and if so may involve a recessive gene with low penetrance or may be polygenic. No affected individual produced offspring. The accessory lobe consisted of a round intrathoracic mass with vascular connections to the cava or suprahepatic veins. Microscopically, there was disarray of the normal architecture, blood stasis, and severe chronic congestion, which often led to rupture of the dilated vessels and formation of large hemorrhagic areas.

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