28-year-old male with UC on Humira with cat bite. Right forearm cellulitis, pain with extension and flexion of the wrist. Rule out abscess or tenosynovitis. Markers were placed along the radial aspect of the wrist and distal forearm. There is thickening of the skin along the radial aspect of the wrist and forearm with reticulation of the underlying subcutaneous fat and enhancement compatible with the stated history of cellulitis. There is also mild enhancement of the peripheral deep fascia of the forearm musculature along its volar and distal aspect. This enhancement also surrounds the flexor carpi radialis tendon and its muscle, distally, and there is mild edema and enhancement of the distal fibers of the flexor carpi radialis muscle. There is enlargement of and increased signal intensity within the tendon. We see no frank fluid surrounding the tendon. Inflammation also extends medially along the superficial aspect of the flexor forearm musculature with minimal thin enhancement between the superficial and deep musculature of the distal forearm. There is mild edema within the pronator quadratus muscle at its radial attachment. We see no fluid collection to indicate abscess formation. The remaining tendons are unremarkable. The bone marrow signal intensity is within normal limits.
Cellulitis of the right forearm with mild fascial inflammation as described above as well as enhancement surrounding the flexor carpi radialis tendon indicating a tenosynovitis. The tendon itself appears enlarged with increased signal intensity which may reflect chronic tendinosis or acute inflammation.