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Preoperative imaging to predict orbital invasion by tumor
M D Eisen1, D M Yousem, L A Loevner
1Department of Otorhinolaryngology: Head and Neck Surgery, University of Pennsylvania Medical Center, Philadelphia, USA.
Head & Neck
|July 18, 2000
Summary
Preoperative imaging accurately predicts nasolacrimal invasion (89%) but should not replace intraoperative assessment for ambiguous orbital invasion cases. Tumor proximity to periorbita is a sensitive predictor.
Area of Science:
- Ophthalmology
- Radiology
- Oncology
Background:
- Assessing orbital and nasolacrimal system invasion preoperatively is crucial for surgical planning.
- Accurate preoperative imaging is vital for determining the extent of tumor spread.
Purpose of the Study:
- To evaluate the diagnostic accuracy of preoperative computed tomography (CT) and magnetic resonance imaging (MRI) in detecting orbital and nasolacrimal system invasion.
Main Methods:
- Retrospective review of 19 CT and 17 MRI scans from patients at risk for orbital invasion.
- Corroboration of imaging findings with pathological and intraoperative assessments.
Main Results:
- Tumor proximity to the periorbita showed 90% sensitivity for orbital invasion on both CT and MRI.
- Extraocular muscle involvement (MRI: 100%) and orbital fat obliteration (MRI: 80%, CT: 86%) had high positive predictive values.
- CT outperformed MRI in seven of nine evaluated criteria; nasolacrimal invasion was predicted with 89% accuracy.
Conclusions:
- Preoperative imaging is a valuable tool for surgical planning but has limitations.
- Intraoperative assessment remains essential for definitive diagnosis in ambiguous orbital invasion cases.