Mission

Neurology Networks tries to offer broad exposure to various topics that may be presented on the veterinary neurology board exam.

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MRI6

MRI 6

Q.  What are the MRI imaging characteristics for an intracranial hemorrhage that is 4 days old?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 A: 

Stage

Age

Compartment

Hemoglobin

T1

T2

Hyperacute

<24 hours

Intracellular

Oxyhemoglobin

Iso- to hypointense

Hyperintense

Acute

1-3 days

Intracellular

Deoxyhemoglobin

Variable or hyperintense

Hypointense

Early subacute

3-7 days

Intracellular

Methemoglobin

Hyperintense

Hypointense

Late subacute

7-14 days

Extracellular

Methemoglobin

Hyperintense

Hyperintense

Chronic

>14 days

Extracellular

Intracellular

Hemichromes

Hemosiderin

Hypointense

Hypointense

Hyperintense

Hypointense

 

**http://www.radiologywiki.org/w/index.php?title=Intracranial_Hemorrhage#B...

**Practical Small Animal MRI.  Table 2.1   Gavin and Bagley.  Wiley-Blackwell 2009.