RSNA 2016

Abstract Archives of the RSNA, 2016


MSES33C

Multiparametric Imaging of Orbital Lesions

Tuesday, Nov. 29 1:30PM - 3:00PM Room: S100AB



Minerva Becker, MD, PhD, Geneva, Switzerland, (Minerva.Becker@hcuge.ch ) (Presenter) Nothing to Disclose
LEARNING OBJECTIVES

1) Provide a systematic approach for the evaluation of orbital masses. 2) Review key imaging features of benign and malignant lesions. 3) Discuss the importance of multimodality imaging for the differential diagnosis. 4) Summarize potential pitfalls of image interpretation and how to avoid them.

ABSTRACT

Tumors and tumor-like conditions involving the orbit represent a broad spectrum of lesions with a varying degree of malignant potential. As many orbital lesions are difficult to biopsy and to operate on, cross-sectional imaging and accurate image interpretation are mandatory for patient management. In addition, as the orbit is routinely included in the field of view of brain or head and neck examinations, orbital lesions may be revealed incidentally. Knowledge of the clinical presentation, patient’s age and characteristic imaging features is essential for the identification of those lesions, where biopsy is mandatory. This lecture focuses on multiparametric imaging of orbital tumors and tumor-like conditions. The clinical presentation, compartmental location, imaging characteristics and histological features will be discussed for each tumor type. First, lesions of the intraconal compartment arising from the globe (retinoblastoma, uveal melanoma), optic nerve sheath complex (glioma, meningioma) and intraconal vessels (hemangioma) will be presented followed by lesions arising in the extraconal compartment (dermoid, pleomorphic adenoma, lacrimal gland carcinoma, lymphoma, rhabdomysarcoma), as well as bone and paranasal sinus compartment (fibrous dysplasia, osteoma). We will equally review multicompartment lesions (vascular malformations, idiopathic orbital pseudotumor, IgG4 related disease, metastases) and we will discuss imaging pitfalls and how to avoid them. The role of advanced techniques including diffusion-weighted imaging (DWI), FDG positron emission tomography CT (FDG PET/CT) and FDG PET/MRI will be presented, in particular their added value for the evaluation of masses with non-specific CT and MRI findings.

Handout:Minerva Becker

http://abstract.rsna.org/uploads/2016/16000860/Becker-Orbit_RSNA2016-handout.pdf