A 43-year-old man presented with left hip pain when moving his thigh over the past week without any history of trauma. An ultrasound revealed a small amount of fluid in the left hip joint and increased blood flow in the surrounding muscles. A CT scan found nothing abnormal. An MRI detected what appeared to be avascular necrosis of the femoral head. The patient is asking for a comparison of the diagnostic value of ultrasound, CT scan, and MRI for evaluating his left hip pain.

1. CASE 304: HIP PAIN, Dr PHAN THANH HẢI, MEDIC MEDICAL CENTER,
HCMC, VIETNAM.
Man 43 yo, one week ago, pain at his left hip while moving his thigh, no
trauma history.
Ultrasound first saw the left hip joint having a small amout of fluid
collection and more Power Doppler in muscles around the hip ( see 4 US
images).

2. MSCT was done but radiologist said nothing abnormal detected.
MRI detected abnormal head of left femur bone looked like aseptic
necrotic femoral head.

3. Please compare diagnostic values of 3 diagnostic modalities for this
case:ultrasound, MSCT and MRI.