Lesion that is not seen on T1 precon but demonstrates "stipple" enhancement on postcontrast images in the pons - this is consistent with capillary telangiectasia.
- Most are in pons - but can be seen in cerebral, cerebellar and spinal cord tissue
- Nearly always asymptomatic and no further intervention necessary
- 16-20% of intracerebral vascular malformations at autopsy
- CT - almost always normal
- T1 - hypo to iso to brain
- T2 - normal (often) or slightly hyperintense
- T2* - can be normal or low in signal - but not due to hemorrhage or calcification - and likely represents deoxyhemoglobin in slow flowing blood
- T1 postcon - brush like or stippled pattern
- No mass effect
- 2/3 have enlarged vessel that may represent a draining vein.
- Often considered an acquired lesion and may represent obstructed venous drainage
- Can be seen in association with cavernomas and AVMs
- Does not show up on angiography
Reference - http://www.ajnr.org/cgi/content/full/22/8/1553 and http://emedicine.medscape.com/article/337451-overview
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