This 7 year old presents to your clinic with 2 day hx of worsening right eye vision and pain on eye movement 
1. What is the diagnosis?
2. What complications can result? 
3. What are the indications for an out of hours CT scan?
4. What are the indications for urgent intervention? 
5. Describe the management
6. What is the grading criterion?

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Case courtesy of Assoc Prof Frank Gaillard, <a href="https://radiopaedia.org/?lang=gb">Radiopaedia.org</a>. From the case <a href="https://radiopaedia.org/cases/4869?lang=gb">rID: 4869</a>