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Cholescintigraphic normal gallbladder visualization with delayed or nonobservable bowel activity.

W J Shih·F Kang·N H Shou·S C Chia
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CholelithiasisDiagnosis, DifferentialFemaleGallbladderHumansIntestinesMiddle AgedRadionuclide ImagingCase ReportsJournal Article

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W J Shih, F Kang, N H Shou, S C Chia. 1993. Cholescintigraphic normal gallbladder visualization with delayed or nonobservable bowel activity.. https://doi.org/10.1016/s0001-2998(05)80098-4

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Gallbladders with cholesterolosis removed surgically for cholelithiasis were studied by light and electron microscopy as well as by cytochemical methods to demonstrate the presence of free cholesterol in the epithelial cells. Lipid droplets were found not only in the submucosa, but also in the infranuclear cytoplasm of epithelial cells. These contained well developed mitochondria and an agranular endoplasmic reticulum. Macrophages were often present between the epithelial cells and the submucosa, and protruded numerous processes, which also contained well developed cell organelles, abundant lysosomes and lipid droplets. With the excessive lipid deposition, macrophages were filled with lipid droplets and became foam cells. In the epithelial cells, many reaction precipitates occurred after digitonin treatment and some of them were observed in the endoplasmic reticulum. It is suggested, therefore, that free cholesterol is absorbed by epithelial cells and thereafter becomes esterified in the endoplasmic reticulum and thus appears as lipid droplets. Lipid droplets synthesized in the epithelial cells may then be released into the intercellular space, and phagocytosed there by macrophages. It is thus suggested that macrophages filled with lipid droplets may become too large and rigid to pass through the endothelium of lymph vessels, and those large "foam cells" may cause the destruction of lymph vessels. Those sequential events should eventually advance the accumulation of foam cells in the submucosa.

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