Related Experiment Video
Updated: Feb 3, 2026

Rat Model of Photochemically-Induced Posterior Ischemic Optic Neuropathy
Published on: November 29, 2015
Compressive optic neuropathy secondary to Ewing sarcoma in the paranasal sinus: A case report
Min Jee Lee1, Min Ho Kang1, Jong Hun Yeom2
1Department of Ophthalmology.
Rationale:
Ewing sarcoma localized in the paranasal sinuses, compressing the optic nerve, is very rare, with no prior case reports PATIENT CONCERNS:: A 68-year-old woman presented with decreased visual acuity in her left eye and paresthesia of the left face. Brain magnetic resonance imaging showed heterogeneously enhancing mass in the left paranasal sinuses with adjacent bone destruction, extending to the extraocular muscles and optic nerve of the left orbit. A biopsy of the nasal cavity confirmed Ewing sarcoma.
Diagnosis:
Compressive optic neuropathy secondary to Ewing sarcoma in the paranasal sinuses.
Intervention:
Neoadjuvant chemotherapy and radiotherapy were performed.
Outcomes:
Resolution of the tumor and increased visual acuity and field of the left eye.
Lessons:
Primary head and neck Ewing sarcoma can lead to compressive optic neuropathy, but the tumor responded well to the chemotherapy. Early diagnosis and immediate treatment by close cooperation between the ophthalmologist and oncologist can prevent from permanent visual loss.
Related Concept Videos
Secondary Active Transport
Secondary Healthcare System
Primary and Secondary Growth in Roots and Shoots
Secondary Distribution
In residential areas, 120/240 V single-phase, three-wire service is commonly used for lighting, outlets, and large appliances. Urban areas with high-density loads...
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
Secondary Lymphoid Organs
The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...

