The purpose of this exhibit is:
Investigate the meaning of the images punctate of low signal ("black dots") on magnetic susceptibility sequences.
Consider the differential diagnosis of the various causes of cerebral microbleeds, illustrating all with images collected during asistencial activity developed in our center.
"Hot spots" in the sequence T2 * and currently the most modern magnetic susceptibility sequences are hypointense lesions less than half centimeter of diamtero, that go unnoticed in other MR sequences.
These images are derived from a ferromagnetic artifact produced by accumulation of hemosiderin inside macrophages after microhemorrhages.
Causes of "black dots" produced by micro bleeds are:
- Congofila or amyloid angiopathy.
- Hypertensive angiopathy.
- Multiple cavernous.
- Diffuse axonal-Injury.
- Hemorrhagic micrometastasis.
- Microembolisms metal originators from artificial heart valves.
- Vascultitis
- CADASIL.
With magnetic susceptibility sequences we identify "black spots" not visible in other sequences. Considering its distribution, morphology, other MRI findings and the clinical context of the patient, we can guide a differential diagnosis between various pathologies that may determine it.
Lagana, C,
Fresno, L,
Hypointensities in the Brain on T2* Weighted Gradient Echo MR Imaging: What Radiologist Should Know. Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL.
http://archive.rsna.org/2014/14004042.html
