BRAIN STEM AND CEREBELLUM..
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1 Lecture Title: BRAIN STEM AND CEREBELLUM.. (CNS Block, Radiology) Dr. Hamdy Hassan Ass.Prof. Consultant Radiology Department KKHU King Saud University
2 Lecture Objectives.. Students at the end of the lecture will be able to: Identify radiological anatomy of brain stem and cerebellum. Compares CT and MRI imaging of brain stem and cerebellum. Recognize the imaging findings in common diseases involving brain stem and cerebellum.
3 Brain Divisions.. There are three major divisions of the brain: I Prosencephalon Forebrain Diencephalon thalamus, hypothalamus Telencephalon cerebrum II Mesencephalon Midbrain III Rhombencephalon - Hindbrain Metencephalon pons and cerebellum Myelencephalon medulla oblongata
4 Brain Stem.. Three parts from superior to inferior: 1 midbrain 2 pons 3 medulla oblongata Connects cerebral hemisphere with spinal cord 2 1 3
5 Midbrain.. Radiological Features: At the level of circle of willis CT+ Anteriorly two cerebral peduncles separated by interpeduncular fossa Posteriorly four rounded prominences (superior and inferior colliculi) MRI T2WI
6 Midbrain.. MRI Sagittal T1WI MRI axial T2WI superior colliculus 2 inferior colliculus 3 cerebral peduncle 4 interpeduncular cistern
7 Midbrain.. Internal features: substantia nigra separates crus cerebri ventrally from tegmentum posteriorly. Red nuclei are dorsal to substantia nigra at the level of superior colliculi
8 Pons.. Radiological Features: The bulbous anterior part consists mainly of fibres continuous on each side with middle cerebellar peduncle Basilar artery lies in groove anteriorly Posterior surface of the pons forms the upper part of the floor of the 4 th ventricle. CT+ Petrous bone Bony anterior relation: clivus centrally and petrous temporal bones laterally Basilar artery
9 Pons.. MRI axial T2WI MRI Sagittal T1WI 2 3 p p 1 1 P pons 1 4 th ventricle 2 basilar artery 3 middle cerebellar peduncle
10 Medulla oblongata.. Radiological Features: CT+ MRI imaging of the medulla gives superior images to CT due to lack of bony artifact The ventral median fissure is seen anteriorly with the pyramid laterally The 4 th ventricle is seen posteriorly MRI axial T2WI medulla
11 Cerebellum.. Radiological Features: On axial Ct & MRI the cerebellum is separated from the pons by the 4 th ventricle and connected to the pons on each side by middle cerebellar peduncle, it is bounded anteriorly by petrous temporal bone p CT+ Petrous bone cerebellum On higher slices it is separated from temporal and occipital lobes anterolaterally by tentorial margins, tentorium can be seen on contrast enhanced studies owing to the contained superior petrosal sinus tentorium Middle cerebellar peduncle
12 Cerebellum.. Radiological Features: MRI axial T2WI Cerebellum is connected to the brainstem by three pairs of cerebellum peduncles: Superior...connected to the midbrain Middle...connected to the pons inferior...connected to medulla oblongata flocculus Two cerebellar hemisphere with midline vermis vermis Flocculus is a small ventral portion of the hemisphere Tosils are the most anterior inferior part of the hemispheres that lie close to the midline axial CT tonsil tonsil MRI sagittal T1WI
13 Cerebellum.. CT+ Radiological Features: The superior vermis can be seen between occipital lobes on section through the thalamus. Superior vermis
14 Cerebellum.. Cerebellar Vermis
15 Common diseases of brainstem & cerebellum.. CT MRI axial FLAIR MRI axial T2WI Hyperdense basilar artery Acute infarction due to basilar artery thrombosis
16 Common diseases of brainstem & cerebellum.. Diffusion sequence Acute infarction due to basilar artery thrombosis
17 Common diseases of brainstem & cerebellum.. Sag MRI T1WI axial MRI T2WI axial MRI T1WI contrast Brain stem glioma
18 Common diseases of brainstem & cerebellum.. Sag MRI T1WI contrast axial MRI T2WI axial MRI T1WI contrast Medulloblastoma
19 Common diseases of brainstem & cerebellum.. Sag MRI T1WI contrast axial MRI T1WI contrast Coronal MRI T1WI contrast Ependymoma
20 Common diseases of brainstem & cerebellum.. Sag MRI T1WI axial MRI T2WI Coronal MRI T1WI contrast Hemangioblastoma
21 Common diseases of brainstem & cerebellum.. CT Sag MRI T1WI axial MRI T2WI axial MRI SWI Cavernous angioma
22 Common diseases of brainstem & cerebellum.. axial MRI T2WI axial MRI T1 contrast Cerebellar tuberculosis
23 Common diseases of brainstem & cerebellum.. axial MRI T1 contrast TB meningitis with multiple tuberculomas
24 Reference book and the relevant page numbers.. Stephanie Ryan, Anatomy for Diagnostic imaging, 2 nd Edition, Pages Jamie Weir, Peter Abraham, Imaging Atlas of Human Anatomy 3rd Edition, Pages Peter Armstrong, diagnostic imaging, 5 th Edition, Pages ( )
25 Thank You (CNS Block, Radiology) Dr.Hamdy Hassan 11-12/9/2013
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