Direct comparison of histology of microbleeds with postmortem MR images: a case report.

BACKGROUND

Although the clinical significance of so-called microbleeds (MBs) in gradient-echo MR images (GRE-MRI) has been extensively researched, the histopathological evaluation is notably insufficient.

METHODS

Postmortem GRE-MRI was obtained of water-immersed formalin-fixed tissue blocks from a 97-year-old hypertensive woman with 9 antemortem MBs. Histologic slides were compared with those of MRI.

RESULTS

Microscopic examination revealed clusters of hemosiderin-laden macrophages in 8 MBs and arteriolar pseudocalcification in 1 MB in the left pallidum. Hypertensive microangiopathies were found in 5 lesions. The sizes of the lesions with hemosiderin deposits were roughly comparable with the MBs of GRE-MRI.

CONCLUSIONS

All of the MBs but for 1 exception were proved to be hemosiderin deposits and frequently associated with hypertensive microangiopathy.