Compare the diagnostic criteria of CT/MRI and ultrasound for the detection of secondaries in neck. What are the sensitivity and specificity of these imaging modalities in such conditions?

Malignant lymphnodes

• No echogenic eccentric hilum
• Discolored colour Doppler
• Rounded : RT < 1.5
• Size usually >10 mm ∼7 mm in upper jugular chain and 6 mm  in ref.
• Hypoechoeic and heterogeneous
• Cystic or necrotic areas

Sensitivity: 84%

Specificity: 68%

Accuracy: 70%

• Invasing surrounding tissue
• ill depend margin
• Calcification (PTC)
• Absent of hilum (90%)
• ↑ vascularity

Thyroid:

Sensitivity: 63-87%

Specificity: 81- 91%

Accuracy:80-94%