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emmedonline
Dr. Ajith Kumar J MD
Dept. of Emergency Medicne
Travancore Medicity, Kollam
India
editor
TUMOR
Brain tumors usually appears as hypodense, poorly defined lesions on noncontrast CT scans.
It is estimated that 70 – 80% of brain tumors will be apparent on plain scan.
Calcification and hemorrhage associated with a tumor can cause it to have a hyperdense appearance.
Tumors should be suspected on a noncontrast CT when significant edema is associated with an ill defined mass.
IV Contrast material can help to define tumors. Contrast media will leak through the incompetent blood brain barrier into extracellular space surrounding the mass lesion, resulting in a contrast enhanced ring.
ABSCESS
Brain abscess will appear as an ill-defined hypodensity on non contrast CT scan.
Ring enhancement is seen with administration of IV contrast.
ISCHEMIA
Non hemorrhagic infractions can be seen as early as to 2-3 hrs following insult, but most will begin to be clearly evident on the CT scan for 12 – 2 4 hrs.
Earliest change in ischemia
Loss of grey white differentiation
Insular ribbon sign
Lacunar infract are seen as discrete non hemorrhagic lesions over basal ganglia region secondary to hypertension.
Picture 1 : Insular Ribbon Sign.Note the loss of definition of the insular cortex on the left side, compare with normal insular cortex on the right side. Picture 2: Note the Hyperdense MCA on the right side indicating thrombus load and note the surronding area there is loss of grey white differentiation.
Grey White Differentiation
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Updated on 19/7/2015
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emmedonline
Dr. Ajith Kumar J MD
Dept. of Emergency Medicne
Travancore Medicity, Kollam
India
editor