Learning objectives
The purpose of this poster is to describe the key anatomical features of the orbit and to emphasize the role of imaging in detection and characterization of orbital tumoral pathology.
Background
The orbit and visual system represent a complex and intricately organized region,
with specialized anatomy and physiology.
A variety of diseases determine space-occupying lesions in this region.
These include congenital,
vascular,
inflammatory and infectious disease,
as well as benign and malignant neoplasms.
Cross-sectional imaging is essential in the diagnosis and evaluation of orbital neoplasms,
supplementing findings from fundoscopy and clinical ophthalmologic examinations.
CT is considered convenient because of the natural contrast provided by the adjacent structures with widely different attenuation coefficients like fat,
bone,
fluid,...
Findings and procedure details
I. ANATOMICAL FEATURES
A thorough understanding of orbital anatomy is essential in evaluation of orbital neoplasms.
The primary location of a lesion can help guide the differential diagnostic and meticulous descriptions of lesion location,
involved structures and extent can enable proper treatment planning.
The bony orbit comprises four walls,
four rims and the apex.
The medial wall is represented predominantly by the lamina papyracea,
a thin portion of the ethmoid bone.
Anterior to the lamina papyracea is the lacrimal bone (containing the nasolacrimal duct) and...
Conclusion
Thorough anatomy knowledge and the use of the compartmental approach in assessing orbital lesions with consideration of histologic composition is essential in guiding the vast differential diagnostic considerations for this complex group of diseases.
References
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Tina D.
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Divakar Gupta,
Roberta W.
Dalley,
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Dirk Keene,
and Yoshimi Anzai.
Orbital Neoplasms in Adults: Clinical,
Radiologic,
and Pathologic Review.
RadioGraphics 2013 33:6,
1739-1758
2.
Khan SN,
Sepahdari AR.
Orbital masses: CT and MRI of common vascular lesions,
benign tumors,
and malignancies.
Saudi Journal of Ophthalmology.
2012;26(4):373-383.
3.
Moore,
Keith L.
Clinically Oriented Anatomy 6th Ed.
Lippincott Williams & Wilkins 2010
4.
Sutton D,
Reznek R,
Murfitt J.
The orbit.
From: Textbook of Radiology and Imaging,
7thed,
vol 2.
Chruchill Livingstone,...