CT HEAD PERFUSION WITH AND WITHOUT CONTRAST:
CLINICAL HISTORY: 53-year-old man with history of recent bilateral posterior division MCA infarcts, new confusion, evaluate for stroke.
FINDINGS:
BRAIN (NON-CONTRAST):
3 images 13-11).
Visualized paranasal sinuses: Clear.
Mastoid air cells: Clear.
Bones: No focal abnormality.
Additional comment: None.
BRAIN (POST-CONTRAST):
Enhancement: There is new
gyral enhancement associated with subacute posterior right MCA infarct, as well as unchanged gyral enhancement associated with late subacute posterior MCA infarct.
INTRACRANIAL ANGIOGRAM:
Anterior circulation: There is a
vessel cut off of the right inferior division M2 at its origin (series 11 images 253-251), with reconstitution of flow in MCA branches within the sylvian fissure from collaterals. Note this vessel cut off is proximal to prior inferior division M2 occlusion with subsequent larger area of perfusion deficit. No left-sided vessel occlusion or stenosis. No aneurysm.
Posterior circulation: No flow-limiting stenosis or aneurysm.
Dural venous sinuses: Patent.
Additional comment: None.
EXTRACRANIAL ANGIOGRAM:
Proximal great vessels: No flow-limiting stenosis or dissection.
Cervical vessels: No flow-limiting stenosis or dissection.
Additional comment: None.
PERFUSION:
There is
significant Tmax delay in the majority of the right MCA territory, with smaller area of reduced CBV/CBF in the anterior temporal lobe corresponding to loss of gray-white differentiation, compatible with tissue at risk, however partially this includes previously infarcted tissue in the posterior right MCA territory.
NECK:
LVAD. Incompletely visualized surgical changes related to CABG. Stable scattered prominent mediastinal lymph nodes.
Bones: Visualized sternotomy alignment.
Lung apices: 5 mm right upper lobe nodule, unchanged from 6/3/2014.
Additional comment: None.
IMPRESSION:
1. Loss of gray-white differentiation in the right anterior temporal lobe with dense vessel in the lateral right MCA cistern, compatible
with acute infarct. Evolving early subacute right posterior MCA and late subacute left MCA infarct with associated gyral enhancement. No evidence of hemorrhagic conversion.
2. Occlusion of the right inferior division M2 at its origin, proximal to prior occlusion with larger amount of tissue affected.
3. Perfusion mismatch, with T-Max delay to majority of right MCA territory, and smaller area of reduced CBV/CBF in the right anterior
temporal lobe, however true tissue at risk is difficult to determine as perfusion deficit includes in part prior posterior infarct.