venöse Kanäle und Lakunen der Kalotte

Radiological
review of skull lesions. Venous channels and lakes. Axial (a), coronal (b) and sagittal (c) head CT images depict serpiginous structures in the frontal and parietal bones (arrowheads) representing prominent venous channels. Axial head CT (d) and axial post-contrast T1-weighted (e) images show a lucent focus along the left parietal bone with enhancement consistent with a venous lake (dashed arrows). There are also mildly prominent serpiginous venous channels in the frontal bones (thick arrows)
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Spectrum of
lytic lesions of the skull: a pictorial essay. Venous lacuna (VL). Axial CT image with bone (a) window showing a lytic lesion within the left parasagittal diploic space (arrowhead), confirmed on T2-weighted sequence (b). In a caudal slice, a right parasagittal AG can be depicted (c, d)
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Radiopaedia • CC-by-nc-sa 3.0 • de

Venous lacunae also known as venous lakes are enlarged venous spaces within the skull, most often in the parasagittal region. They are normal variants and their primary importance is that they may mimic lytic lesions.

Anatomy 

Venous lacunae are the result of focal venous dilatations located within the diploid space of the skull, most commonly encountered adjacent to the superior sagittal sinus. They receive blood from the cerebral veins as well as meningeal veins and connect to diploic and emissary veins .

They can be invaginated by arachnoid granulations and therefore act as a means of CSF absorption .

Radiographic features

Plain radiograph

Venous lacunes are seen as a lyric area adjacent to the sagittal suture, mainly in the parietal bone.

CT

On CT, venous lacunes appear as sharply demarcated regions of lucency with blood density centrally. As they are venous structures, they demonstrate enhancement on delayed postcontrast studies .

MRI

Similarly, on MRI venous lacunes resemble other venous structures.

Siehe auch:
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Assoziationen und Differentialdiagnosen zu venöse Kanäle und Lakunen der Kalotte:
Pacchionische
Granulationen
Wikipedia • CC BY-SA 4.0
Hämangiom
Schädelkalotte
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