Nerve Sheath Tumors
Nerve Sheath Tumors KEY FACTS Terminology • Tumor arising from nerve; histologically classified as either schwannoma or neurofibroma • 3 types of neurofibroma: Localized, diffuse, and plexiform Imaging • Any peripheral nerve can…
Ganglion Cyst
Ganglion Cyst KEY FACTS Imaging • Fluid-filled mass with stalk extending toward joint • Ovoid or irregular configuration with stalk connecting to joint of origin Elongated neck allows cyst to surface at…
Inflammatory Arthritis
Inflammatory Arthritis KEY FACTS Terminology • Systemic autoimmune inflammatory disorders of synovium with secondary involvement of articular surface and bone • Spondyloarthropathy associated with enthesitis Imaging • Thickened hyperemic synovium • Any synovial-lined joint…
Joint Injection: Upper Limb
Joint Injection: Upper Limb KEY FACTS Procedure • Glenohumeral joint injection Anterior (rotator interval) or posterior approach – Anterior approach preferable Less painful & more comfortable position for patient Needle tip positioned…
Bone Infection
Bone Infection KEY FACTS Imaging • Periosteal thickening and hyperemia with juxtacortical edema • US can depict outer cortical, periosteal, and extraosseous changes Periosteal thickening ± juxtacortical soft tissue edema and hyperemia…
Rotator Cuff/Biceps Tendinosis
Rotator Cuff/Biceps Tendinosis KEY FACTS Terminology • Collagenous degeneration of rotator cuff ± biceps tendons with proteoglycan deposition Imaging • Supraspinatus > subscapularis, biceps and infraspinatus • Subclinical tendinosis very common and usually…
Muscle Injury
Muscle Injury KEY FACTS Terminology • Contusion : Direct blunt compressive trauma to muscle without definable tear • Tear : Discontinuity of muscle fibers typically at myofascial or myotendinous junction • Hernia :…
Baker Cyst
Baker Cyst KEY FACTS Imaging • Fluid-filled sac with neck arising from interspace between medial gastrocnemius muscle & semimembranosus tendon Cyst must have neck emerging from gastrocnemius muscle and semimembranosus tendon…
Gout and Pseudogout
Gout and Pseudogout KEY FACTS Terminology • Inflammatory arthropathy due to urate crystal deposition (gout) or calcium pyrophosphate dihydrate (CPPD) crystal deposition (pseudogout) Imaging • US signs usually specific enough to make…
