Rare inflammatory process affecting colon's appendices epiploicae. Affects 1.3% of abdominal pain cases, 8.8 per 1,000,000 years. Predominantly affects women and obese individuals aged 2nd-5th decades
Benign bone tumor containing osteoclast-like giant cells. Most common benign tumor in children, affecting 30-40% of normal children. Occurs in metaphysis of long bones, especially lower extremities. Usually asymptomatic and discovered incidentally
Cystic renal mass is defined as having <25% enhancing tissue. New classification aims to reduce interobserver variability and improve malignancy prediction. Terms like 'complicated cyst' should be avoided
PET/CT studies require proper patient preparation and technical assessment. Optimal windowing uses grey scale with liver as reference organ. Rainbow color scale helps differentiate low, moderate and high activity. SUV threshold should be adjusted to liver background for consistent interpretation
CTA visualizes arteries and veins using contrast injection. Used to detect blockages, aneurysms, dissections, and stenosis. Can examine heart, aorta, lungs, kidneys, head/neck, arms/legs. Helps locate arterial/venous bleeding in gastrointestinal system
Subdural hygroma is CSF collection under brain's dural membrane. Requires meningeal layer separation and uncompressed subdural space. Appears on CT scan after 9 days, sometimes with hemorrhage