MRI Flashcards
What ist he most common meniscal tear?
Oblique tear through the posterior horn of the medial meniscus
Which side is a discoid meniscus more common?
Lateral
What is the associatied finding with discoid menisci?
Higher risk of tear
Meniscal cysts
Why is it important to describe a tear with a meniscal cyst?
Changes the surgical approach from percutaneous to intraarticular
What is the association with spinoglenoid ganglion cysts other than infraspinatus atrophy? Who gets them?
Posterior labral tears
athletic, weightlifters
What muscle is affected in quadrilateral space syndrome? What are the borders?
Teres minor
Humerus - lateral
Teres minor - superior
Teres major - inferior
Long head of triceps - medial
What is parsonage Turner? What are the associations?
Brachial plexus neuritis - neurogenic edema in a muscle group supplied by a brachial plexus nerve
Vaccination, viral illness, anaesthesia
What is the difference between tenosynovitis, tendinosis, partial tear, and disruption?
Tenosynovitis - fluid in the tendon sheath with normal appearing tendon
Tendinosis - increased signal in a tendon that doesnt get fluid bright
Partial tear - fluid signal within the tendon
Disruption - absence of tendon on one or more images
What is associated with achilles tendon rupture?
RA, collagen vascular diseases, crystal deposition diseases, hyperparathyroidism
Can the achilles tendon have tenosynovitis?
No, there is no tendon sheath
What systemic disease is associated with PTT rupture?
RA
Where is the PTT most commonly torn? What results clinically?
Tibiotalar joint
Flat foot due to loss of PTT arch support
What structure is commonly torn with a PTT tear? 3rd most common?
Spring ligament
Sinus tarsi
What is a flake fracture?
Small bony avulsion off the fibula seen with a superior retinaculum disruption which displaces the peroneal tendons
What is the mechanism of injury in longitudinal split tears of the peroneus brevis? What is associated?
Inversion and dorsiflexion
Lateral ligamentous injury
What indicates an unstable OCD lesion?
Bright T2 signal
What is the MR appearance of giant cell tumors of the tendon sheath?
Dark on T2 and T1
What is tarsal tunnel syndrome?
Impingment of the the posterior tibial nerve in the tarsal tunnel, usually due to ganglion cyst as a result of trauma or fibrosis
What 4 tumors are seen in the foot
SBC, GCT, Chondroblastoma, infection
What is seen in anterolateral impingement syndrome?
Hypertrophy and scarring of the synovium in the lateral gutter of the ankle
What are the three key MR findings in osteomyelitis of the foot?
Cortical disruption
Sinus tract
Bony abscess
What is sinus tarsi sydrome? How is it seen on MR? What are the ligaments?
lateral ankle pain and hindfoot instability
Fat in sinus tarsi is dark on T1 and bright on T2
Cervical and interosseous ligaments
What 4 conditions should always be looked for on ankle MR, especially if lateral ankle pain
ATFL disruption or scarring
Sinus tarsi syndrome
Longitudinal split tear of peroneous brevis
Anterolateral impingement
What is the pathology in TMJ?
Anterior placed disc between mandibular condyle and temporal bone
