Imaging Flashcards
Anechoic or hypoechoic tendon sheath widening on US….
Tenosynovitis on US
Abnormal hypoechoic intra-articular tissue that is nondisplaceable and poorly compressible on US…
Synovitis on US
-does not differentiate PsA vs. RA
Discontinuity of bone surface visible in 2 perpendicular planes on US…
Erosion on US
-does not differentiate PsA vs. RA
Hypoechoic swelling of soft tissue surrounding tendon (extensor) on US…
Peritendon inflammation (PTI)
-PTI is VERY SPECIFIC to early PsA, ~97%
-absence of PTI does not rule out PsA
What is the best imaging modality for Takayasu arteritis?
MRA
What does a “high riding humeral head” on shoulder xray typically mean?
Rotator cuff tear
-more likely with a large supraspinatus tear
Which finding on capillaroscopy would be most specific for scleroderma?
Capillary diameter greater than 50um
-seen in early and active scleroderma
-normal is up to 50um
-late stages, density will drop below 3 capillaries per linear mm
-care 2021, q58
On MRI of SI joints, what does subchondral bone resorption with minimal cartilage surface irregularity a hallmark of?
HyperPTH
On MRI of SI joints, what does triangular area of sclerosis adjacent to inferior SI joint a hallmark of?
OCI
What does the Sharp/van der Heijde radiographic scoring system components consist of?
Erosions and joint space narrowing
Young male patient with UE weakness. Also with BL sensorineural hearing loss. All MSAs are negative. CK 800. EMG shows mild myopathic changes with low amplitude, short duration and polyphasic potentials.
He has winging of the left scapula….
Facioscapulohumeral dystrophy
-3rd most common form of muscular dystrophy
-inappropriate expression of DUX4 gene
-scapular winging*
-sparing of deltoid is unique
-*Beevor sign, upward displacement of umbilicus with neck flexion (weakness of abd muscles)
What does synovitis on US look like?
Noncompressible, hypoechoic intra-articular tissue. Power Doppler signal shows increased vascularity of synovium, which mean active inflammation
