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Globular hepatic amyloid--an unusual morphologic presentation
Abstract:
Hepatic amyloid, when identified, is usually located in the sinusoids, portal tracts, and arterioles. We report 14 cases of hepatic amyloidosis where eosinophilic globules having the histochemical and electron microscopic features of classic amyloid were found. The globules were round to oval, 5 to 40 micrometer in diameter, and were found within the space of Disse as well as aggregated within the portal tracts. There were no distinctive clinical or laboratory features distinguishing this type of amyloidosis from classic hepatic amyloidosis. However, there were no cases of multiple myeloma and only one of benign monoclonal gammopathy. All seven patients who were studied at postmortem examination had systemic (nonglobular) amyloidosis. This form of hepatic amyloidosis is probably not an early form of the disease but is an original but rare presentation of hepatic amyloid deposition.
Insights
This study identifies a rare form of hepatic amyloidosis presenting as eosinophilic globules within the liver. These globules share features with classic amyloid but represent a distinct presentation, not an early stage.
Area of Science:
- Pathology
- Gastroenterology
- Histology
Background:
- Hepatic amyloid typically infiltrates sinusoids, portal tracts, and arterioles.
- Classic hepatic amyloidosis lacks distinct clinical or laboratory markers.
Purpose of the Study:
- To characterize a rare presentation of hepatic amyloidosis involving eosinophilic globules.
- To differentiate this presentation from classic hepatic amyloid deposition.
Main Methods:
- Histochemical analysis of eosinophilic globules.
- Electron microscopy of hepatic tissue.
- Clinical and laboratory data review of 14 cases.
Main Results:
- Identified round to oval eosinophilic globules (5-40 micrometers) in the space of Disse and portal tracts.
- Globules exhibited histochemical and ultrastructural characteristics of amyloid.
- No unique clinical or laboratory features distinguished this form from classic hepatic amyloidosis.
- Absence of multiple myeloma and limited monoclonal gammopathy observed.
Conclusions:
- This globular hepatic amyloidosis is an original, rare presentation, not an early stage of systemic amyloidosis.
- Further investigation is needed to understand the pathogenesis and clinical implications of this distinct amyloid deposition pattern.