Hämochromatose Manifestationen am Pankreas
Pancreatic manifestations of hemochromatosis typically occur with primary hemochromatosis, as the organ is usually spared in the secondary form of the disease.
For a general discussion, and for links to other system specific manifestations, please refer to the article on hemochromatosis.
Clinical presentation
Patients present with type 3c diabetes mellitus , but tend to also exhibit other manifestations of hemochromatosis, such as hepatic or cardiac dysfunction.
Pathology
Iron deposition can occur in the pancreas with primary hemochromatosis. Pancreatic involvement is uncommon in patients without liver cirrhosis. Most cirrhotic patients with primary hemochromatosis have pancreatic iron deposition and may have type 3c diabetes mellitus.
Radiographic features
MRI
Iron causes magnetic susceptibility artefact, which leads to spin dephasing (T2*-related signal loss). This dephasing results in decreased signal intensity on MRI images. Like the liver, the pancreas will be markedly hypointense on T2 weighted- and T1-weighted T2* gradient echo sequences .
Dual sequences MR imaging (gradient in and out phase) demonstrates decreased signal intensity in the iron-loaded tissues on the in-phase images compared with the out-phase images (opposite of what you would see with microscopic fat deposit as in hepatic steatosis). This occurs because the echo time of the in-phase sequence is usually higher than that of the out-phase sequence; therefore, the in-phase pulse sequence is more sensitive to iron deposits because of the increased T2* effect .
Siehe auch:
Assoziationen und Differentialdiagnosen zu Hämochromatose Manifestationen am Pankreas:
