Paganini double contour sign

What is Your diagnosis?

You see a PIP joint, palmar longitudinal view

Bursa anserina

What is the exact anatomical location?

Bursitis trochanterica

Where exactly is the bursa located?

New case Elbow

Posterior view of the elbow, longitudinal.
What are Your findings?

source: http://images.rheumatology.org/viewphoto.php?albumId=75676&imageId=4311671

MRT-US Fusion

You see here an axial section of metacarpophalangeal joint affected by erosion and synovitis in patient with RA.

source: http://www.diagnosticimaging.com/ultrasound/article/113619/1387429

US Case Knee infrapatellar region

What is Your US finding and Your diagnosis?

source: http://www.gehealthcare.com/usen/ultrasound/education/products/cme_msk.html