MSK Radiology Quizes by MZeba

Necrotizing Fascitis ⚡Clinical diagnosis ⚡Air in soft tissues in the absence of penetrating trauma:pathognomic ⚡MR:no deep soft tissue abnormality= excellent negative PV MZeba

Iliotibial Band (Friction) Syndrome 🦴Common in athletes, resulting in lateral knee pain due to chronic inflammation of fat near the iliotibial band. 🦴Similar pathology can occur over the greater trochanter. 🦴MRI: ➖For definitive diagnosis is unclear ➖To exclude other causes like meniscal tears or lateral collateral ligament injury. 🦴MRI Findings ➖Knee: Edema in soft tissues lateral to the lateral femoral condyle (lo…

Imaging of Orbital Blow-Out Fracture 🌀Plain Radiograph: 👁️Poor sensitivity 👁️Signs: 👓Black Eyebrow Sign (orbital emphysema), 💧Teardrop Sign (inferior fat herniation) 👁️Fluid in maxillary sinus or ethmoidal air cells may suggest fractures 🌀CT Scan: 👁️Preferred Modality: Thin-slice, bone algorithm 👁️Assess: Fracture location/extent, intra orbital hemorrhage, globe injury, muscle entrapment, fat prolapse 👁…

Klippel-Feil Syndrome: Cervical vertebral fusion; diagnosed with fusion of two or more cervical vertebrae. 🌀 Associations: 🦴Shoulder deformity (Sprengel) 🦴Wildervanck, Duane syndromes 🦴Aortic arch anomalies 🦴Spinal scoliosis, disc herniation, cervical spondylosis 🦴Renal abnormalities 🌀Classic triad (short neck, low hairline, restricted neck motion) present in <50% of cases 🌀Classifications: 🦴Type I: Extensive cervi…

Imaging of SCFE 🌀XR ➖Views: AP and Frog-Leg (bilateral for comparison) ➖Pre-Slip: Widened growth plate, irregular physeal edges ➖Acute Slip: Posteromedial slippage ➖Chronic Slip: Sclerotic physis, widened metaphysis (coxa magna) Key Signs: 🐸Frog-Leg View: Best for visualizing posterior and medial slip 🐸AP View: Klein’s Line misses epiphysis (Trethowan sign) 🐸Loss of Triangular Sign: Metaphysis displaced laterally 🐸M…

ACL Tears 🌀Associations: ➖O'Donoghue unhappy triad ➖Segond fracture ➖Posteromedial corner injury ➖Meniscocapsular separation 🌀XR ➖Deep lateral sulcus sign ➖Anterior tibial translocation sign ➖Segond fracture ➖Arcuate fracture ➖Joint effusion 🌀CT: ➖High specificity and sensitivity for ACL disruption ➖Characterizes avulsed 🦴 fragments. 🌀MRI: 🔥Primary Signs: ➖Swelling, increased T2 or fat-saturated PD signal ➖Fiber d…

Meniscal Root Tears: 🌀Occurrence: 1. Acute injury in younger patients 2. Degenerative process in older patients 🌀 Classification: LaPrade classification system is commonly used and can be partially applied to MRI 🌀 MRI Findings: 1. Medial Posterior Root Tears: Shortening or absence of the root on sagittal images Vertical fluid cleft on coronal T2-weighted images 2. Lateral Posterior Root Tears: Appearance similar to …

OSTEOPOROSIS 🌀 Gold Standard: DEXA 🌀 CT: Osteoporotic vertebra have HU <95-110.

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Slip Capital Femoral Epiphysis Grading: 📜 Graded based on the displacement of the epiphysis in relation to the metaphysis 1. Mild: lateral edge of the epiphysis is within the lateral third of the metaphysis 2. Moderate: lateral edge between the lateral 1/3 and halfway point of the metaphysis 3. Severe: medial third (over the halfway point of the metaphysis) (Radiopedia)

Pyknodysostosis: --- Osteosclerosis with narrowed medullary cavities is the main generalised imaging finding. --- Long bone fractures are common. --- pyknodysostosis differs from osteopetrosis by: 1. Wormian bones; delayed closure of sutures and fontanels (prominently the anterior) 2. Obtuse mandibular angle. 3. Gracile clavicles that are hypoplastic at the lateral ends 4. Partial absence of the hyoid bone. 5. Hypopl…

OCD --- The STIR sequence is helpful in the depiction of chondral lesions in the patellofemoral joint --- MRI features that aid in diagnosis include: 1. The location and extent of bone marrow edema. 2. The presence of a fracture line. 3. Hypointense area immediately subjacent to the subchondral bone plate. 4. Deformity of the subchondral bone plate https://pubs.rsna.org/doi/10.1148/rg.2018180044