[Quantitative and qualitative analysis of cell lesions from the pancreas after 4 weeks of B1-avitaminosis (author's transl)].

Light- and electronmicroscopical observations are made on the pancreas of 18 rats after 4 weeks of B1-avitaminosis. The B1-avitaminotic animals show a definite decrease in bodyweight and in the weight of their pancreas. The mitochondria of the acinar cells are swollen and invaded by numerous vacuoles. Single cells die by eosinoplilic necrosis. The islets of Langerhans demonstrate a definite hyperplasia (polynesis) and hypertrophy (macronesis). The mitochondria are swollen and also transformed into vacuoles. There is a lysosomial granulolysis. Only occasional lesions are observed in the A1 and A2 cells of the islets.