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REGIONAL NEUROANATOMY
and DIFFERENTIAL DIAGNOSIS:
PART 2 - Infratentorial Lesions
PART 2 - Supratentorial Lesions

James G. Smirniotopoulos, M.D.
Professor of Radiology, Neurology, and Biomedical Informatics
Chairman, Department of Radiology and Radiological Sciences
Uniformed Services University of the Health Sciences
4301 Jones Bridge Road
Bethesda, MD 20814
Voice: 301-295-3145
FAX: 301-295-3893

DISCLAIMER

The opinions expressed herein are those of the author(s), and are not necessarily representative of the Uniformed Services University of the Health Sciences (USUHS), the Department of Defense (DOD); or, the World Health Organization (WHO).

Medicine is a constantly changing field, and medical information is subject to frequent correction and revision. Therefore the reader is entirely responsible for verifying the accuracy and relevance of the information contained herein.

Portions Copyright © 1997 - 2006 by James G. Smirniotopoulos, M.D.


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Schematic of Locations

PATTERN ANALYSIS

Basic Approach

PATTERN ANALYSIS

Where is the Lesion?






INTRAAXIAL:

Differential








INTRAAXIAL:

Differential

EXTRAAXIAL LESIONS

(Location)

EXTRAAXIAL LESIONS

(Differential):

CLASSIC LOCATIONS

CPA MASSES:

Differential

CPA MASSES

Demographics

FEATURES OF CPA MASSES


Differential Diagnosis of CPA Masses
Vestibular Schwannoma Meningioma Epidermoid Cyst
Related to IAC Related to Dura/Tentorium Cisternal Mass
IAC Enlarged No relationship No relationship
Heterogeneous if Large Homogeneous Does NOT enhance
Round, Acute Angle Hemisphere, Obtuse Angle Undulating/Serpentine

*

CHILDHOOD CEREBELLAR/IV:

Differential






DEEP CEREBELLAR (ADULT)

POSTERIOR FOSSA

INCIDENCE/LOCATION:

DRAWING

SELLA/PARASELLAR REGION

Differential:

PITUITARY ADENOMA

Sexual Dimorphism

paste table

SELLA/PARASELLAR

Differential Features:

HYDROCEPHALUS

Differential Diagnosis:






THIRD VENTRICLE

Differential:






BASAL GANGLIA/THALAMUS:

ABOVE FORAMEN OF MONRO

Lateral Ventricle/caudate






INTRAVENTRICULAR NEOPLASMS:






PINEAL/QUAD. CISTERN REGION:






DEEP AND PERIVENTRICULAR:






CONVEXITY (INTRAAXIAL)






CEREBRAL INFARCTION

  1. Abrupt Onset
  2. Gray Matter Involved
  3. Little Mass Effect
  4. Vascular Wedge






CONVEXITY (EXTRAAXIAL)

Differential


END OF SECTION

.
 This page is maintained by:
James G. Smirniotopoulos, M.D.
Professor of Radiology, Neurology, and Biomedical Informatics
Chairman, Department of Radiology and Radiological Sciences
Uniformed Services University of the Health Sciences
4301 Jones Bridge Road
Bethesda, MD 20814
Voice: 301-295-3145
FAX: 301-295-3893

Comment or Questions - Send EMail about this site.



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