38 Questions
On MR images, how do ganglia typically appear?
Round or ovoid masses that are uni- or multiloculated
What is the typical signal intensity of ganglia on T2-weighted MR images?
Hyperintense
Which of the following imaging modalities is most useful in detecting periosteal reaction?
Non-contrast CT
What is a common symptom that can arise from ganglia?
Nerve compression
Phleboliths are commonly associated with which type of lesion?
Hemangiomas
What is the most likely cause of a hypointense mass on T2-weighted MR images?
Fibrosis
Which of the following conditions is associated with masses containing large amounts of hemosiderin?
Phleboliths
What type of lesion can range from fibrotic scars to fibromas and some fibrosarcomas?
Hemangiomas
Which type of masses can be associated with plantar fibroma?
Hemangiomas
What is the significance of evaluating suppression on fat-suppressed T1-weighted images when a mass has areas of hyperintense T1 signal?
To determine if the lesion contains fat
What is a common substance that appears hypointense on T2-weighted MR images?
Calcification
What conditions may be considered if a lesion does not lose signal intensity on fat-suppressed T1-weighted MR images?
Methemoglobin and melanoma metastasis
What is the most likely diagnosis if a mass with areas of hyperintense T1 signal is found to contain fat?
Hemangioma
What is the substance that can cause T1 shortening in lesions that do not lose signal intensity on fat-suppressed T1-weighted MR images?
Proteinaceous fluid
Which of the following conditions is most likely if a patient presents with high T1 signal intensity mass and a history of melanoma?
Melanoma metastasis
What type of MR imaging sequence is best suited for highlighting areas of increased edema within and around a soft tissue mass?
T2-weighted sequence
Which MRI technique is useful for assessing the presence of hemosiderin in soft tissue masses?
T2*-weighted gradient-echo sequence
What is the purpose of using an intravenous contrast agent in MR imaging of soft tissue masses?
To distinguish cystic from solid structures
Which type of calcifications are typically seen on anteroposterior radiographs surrounding a metatarsal shaft?
Phleboliths
What is the main purpose of a fat-suppressed T1-weighted sequence in MR imaging?
Aiding in imaging superficial and deep soft tissues
What imaging finding favors a diagnosis of well-differentiated liposarcoma over a benign lipoma?
Thick (>2-mm) septae
Which of the following can be typically seen in hemangiomas on radiographs or CT images?
Periosteal reaction
What is a possible manifestation of hemangiomas clinically?
Bluish skin discoloration
Which imaging finding can help in characterizing phleboliths?
Hyperintense T1 signal
What can be observed in areas of slow flow in hemangiomas on MR images?
Presence of hemosiderin
What is the typical MR appearance of early-stage myositis ossificans?
Poorly defined mass that is isointense to fat centrally and heterogeneously hyperintense peripherally
How does calcification typically progress in a myositis ossificans lesion?
Starting peripherally and progressing centrally
Which imaging finding can early-stage myositis ossificans be mistaken for?
Sarcoma
What symptoms may be associated with myositis ossificans?
Pain, swelling, and elevated erythrocyte sedimentation rate
How does a mature myositis ossificans lesion appear on MRI?
Hypointense to fat centrally and hyperintense peripherally
What type of artifact is highlighted in the MR image?
Blooming artifact
Which type of lesion can appear T2 hyperintense but is not necessarily fluid-filled?
Myxoid sarcomas
What is an important step to distinguish true cysts from solid lesions?
Intravenous gadolinium-based contrast agent
Which soft tissue tumor is the most common?
Lipoma
How is the classic lipoma described in terms of composition?
Completely fatty without nodularity or septations
Which imaging modality shows the lipoma as radiolucent and isointense relative to subcutaneous fat?
MR images with all pulse sequences
Which lesion type may show blooming artifact on T2*-weighted gradient-echo MR images?
Phleboliths
'Uniformly hyperintense lesion with signal intensity identical to subcutaneous fat' is seen on which MR image sequence?
This quiz covers the interpretation of fat-suppressed spoiled gradient-recalled acquisition in the steady state (SPGR) T1-weighted MR images, focusing on uniform fat suppression of lesions and the absence of thickened septae or nodular areas. It also discusses differential diagnoses for lipomas, including distinguishing them from well-differentiated liposarcomas.
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