MR Imaging and Histologic Features of Capillary Telangiectasia of the Basal Ganglia
Mauricio Castilloa,
Tara Morrisona,
Jo A. Shawa and
Thomas W. Bouldina
a From the Departments of Radiology (M.C.) and Pathology (T.M., T.W.B.), University of North Carolina School of Medicine, Chapel Hill, NC, and Moses Cone Hospital (J.A.S.), Greensboro Pathology Associates, Greensboro, NC.
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FIG 1. Capillary telangiectasia.
A, Noncontrast CT shows slight hyperattenuation in the right basal ganglia with puntacte calcifications.
B, Noncontrast MR T1-weighted image is normal.
C, Axial FLAIR image (slightly below B) shows high signal intensity in the head of the right caudate nucleus.
D, After gadopentate dimeglumine administration, a coronal T1- weighted image shows diffuse enhancement in the right basal ganglia anteriorly. There is a suggestion of large veins (arrowheads) in the malformation.
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FIG 2. Microscopy. Medium power view (10x). Specimen shows gray matter containing several large, thin-walled vascular spaces (long black arrows). Note normal size capillaries (white arrows). The presence of "pencil fibers" (arrowheads) confirms localization to the basal ganglia. Pencil fibers are the white matter tracts of the basal ganglia. They are an integral part of the histologic composition of the striatum, versus the thalamus, where the neurons are scattered throughout a meshwork of white matter. There is no hemorrhage, hemosiderin-laden macrophages, calcifications, or gliosis
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