By Sandy X. Zhang-Nunes MD, Jill A. Foster MD (auth.), Julian D. Perry, Arun D. Singh (eds.)
Written by means of across the world popular specialists, medical Ophthalmic Oncology presents functional assistance and recommendation at the analysis and administration of the full diversity of ocular cancers. The booklet provides the entire cutting-edge wisdom required for you to determine those cancers early and to regard them as successfully as attainable. utilizing the data supplied, readers may be capable of offer potent sufferer care utilizing the newest wisdom on all elements of ophthalmic oncology, to make sure diagnostic conclusions in keeping with comparability with various full-color medical photos, and to find required details speedy because of the clinically centred and uncomplicated structure. This quantity describes the category, differential analysis, and imaging of orbital tumors and discusses the main compatible therapies for various tumor types.
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Extra resources for Clinical Ophthalmic Oncology: Orbital Tumors
Focal inflammation commonly involves the lacrimal gland or the extraocular muscles and may masquerade as malignancy. Diffuse inflammation may involve the intraconal or extraconal compartments and mimic lymphoproliferative disorders, lymphoma, or metastasis. Inflammatory disease rarely causes signs of bone destruction or globe indentation, and these imaging features should raise suspicion for a neoplastic etiology. Retrobulbar hemorrhage may appear as a well-defined, hyperintense lesion on CT. Orbital varices have a variety of appearances on imaging but are typically well defined.
Minimal contrast enhancement suggests a chronic or sclerosing orbital inflammation, tissue fibrosis, or post-therapeutic scar tissue. Moderate to marked contrast enhancement is usually noticed in solid tumors as well as in acute inflammatory orbital lesions. Linear enhancement surrounding a non-enhancing well-delineated lesion suggests the cystic nature of the lesion. Well-defined linear or void of signal within an enhancing lesion may suggest air, high blood flow vessels (artery or vein), fragments of cortical bone, or foreign body.
The cystic lumen shows high signal intensity due to the high proteinaceous content (b) a b Fig. 5 Enlarged optic nerve on coronal post-contrast T1-weighted images. Enhancing pattern of juvenile pilocytic astrocytoma within the right optic nerve (a). Rimlike enhancing left optic nerve sheath meningioma (b) Involvement of the optic nerve with retinoblastoma or melanoma cells, lymphoproliferative tissue, and metastatic process are best detected on post-contrast MR studies. In these cases, the pattern of enhancement within the optic nerve may be localized or diffuse.