Understanding Fat-suppressed SPGR MRI Images
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Questions and Answers

On MR images, how do ganglia typically appear?

  • Fluffy masses with necrotic centers
  • Tubular masses with calcifications
  • Irregular masses with spiculated margins
  • Round or ovoid masses that are uni- or multiloculated (correct)
  • What is the typical signal intensity of ganglia on T2-weighted MR images?

  • Isointense
  • Hypointense
  • Hyperintense (correct)
  • Mixed signal intensity
  • Which of the following imaging modalities is most useful in detecting periosteal reaction?

  • T2-weighted MRI
  • Non-contrast CT (correct)
  • Ultrasound
  • Fat-suppressed T1-weighted MRI
  • What is a common symptom that can arise from ganglia?

    <p>Nerve compression</p> Signup and view all the answers

    Phleboliths are commonly associated with which type of lesion?

    <p>Hemangiomas</p> Signup and view all the answers

    What is the most likely cause of a hypointense mass on T2-weighted MR images?

    <p>Fibrosis</p> Signup and view all the answers

    Which of the following conditions is associated with masses containing large amounts of hemosiderin?

    <p>Phleboliths</p> Signup and view all the answers

    What type of lesion can range from fibrotic scars to fibromas and some fibrosarcomas?

    <p>Hemangiomas</p> Signup and view all the answers

    Which type of masses can be associated with plantar fibroma?

    <p>Hemangiomas</p> Signup and view all the answers

    What is the significance of evaluating suppression on fat-suppressed T1-weighted images when a mass has areas of hyperintense T1 signal?

    <p>To determine if the lesion contains fat</p> Signup and view all the answers

    What is a common substance that appears hypointense on T2-weighted MR images?

    <p>Calcification</p> Signup and view all the answers

    What conditions may be considered if a lesion does not lose signal intensity on fat-suppressed T1-weighted MR images?

    <p>Methemoglobin and melanoma metastasis</p> Signup and view all the answers

    What is the most likely diagnosis if a mass with areas of hyperintense T1 signal is found to contain fat?

    <p>Hemangioma</p> Signup and view all the answers

    What is the substance that can cause T1 shortening in lesions that do not lose signal intensity on fat-suppressed T1-weighted MR images?

    <p>Proteinaceous fluid</p> Signup and view all the answers

    Which of the following conditions is most likely if a patient presents with high T1 signal intensity mass and a history of melanoma?

    <p>Melanoma metastasis</p> Signup and view all the answers

    What type of MR imaging sequence is best suited for highlighting areas of increased edema within and around a soft tissue mass?

    <p>T2-weighted sequence</p> Signup and view all the answers

    Which MRI technique is useful for assessing the presence of hemosiderin in soft tissue masses?

    <p>T2*-weighted gradient-echo sequence</p> Signup and view all the answers

    What is the purpose of using an intravenous contrast agent in MR imaging of soft tissue masses?

    <p>To distinguish cystic from solid structures</p> Signup and view all the answers

    Which type of calcifications are typically seen on anteroposterior radiographs surrounding a metatarsal shaft?

    <p>Phleboliths</p> Signup and view all the answers

    What is the main purpose of a fat-suppressed T1-weighted sequence in MR imaging?

    <p>Aiding in imaging superficial and deep soft tissues</p> Signup and view all the answers

    What imaging finding favors a diagnosis of well-differentiated liposarcoma over a benign lipoma?

    <p>Thick (&gt;2-mm) septae</p> Signup and view all the answers

    Which of the following can be typically seen in hemangiomas on radiographs or CT images?

    <p>Periosteal reaction</p> Signup and view all the answers

    What is a possible manifestation of hemangiomas clinically?

    <p>Bluish skin discoloration</p> Signup and view all the answers

    Which imaging finding can help in characterizing phleboliths?

    <p>Hyperintense T1 signal</p> Signup and view all the answers

    What can be observed in areas of slow flow in hemangiomas on MR images?

    <p>Presence of hemosiderin</p> Signup and view all the answers

    What is the typical MR appearance of early-stage myositis ossificans?

    <p>Poorly defined mass that is isointense to fat centrally and heterogeneously hyperintense peripherally</p> Signup and view all the answers

    How does calcification typically progress in a myositis ossificans lesion?

    <p>Starting peripherally and progressing centrally</p> Signup and view all the answers

    Which imaging finding can early-stage myositis ossificans be mistaken for?

    <p>Sarcoma</p> Signup and view all the answers

    What symptoms may be associated with myositis ossificans?

    <p>Pain, swelling, and elevated erythrocyte sedimentation rate</p> Signup and view all the answers

    How does a mature myositis ossificans lesion appear on MRI?

    <p>Hypointense to fat centrally and hyperintense peripherally</p> Signup and view all the answers

    What type of artifact is highlighted in the MR image?

    <p>Blooming artifact</p> Signup and view all the answers

    Which type of lesion can appear T2 hyperintense but is not necessarily fluid-filled?

    <p>Myxoid sarcomas</p> Signup and view all the answers

    What is an important step to distinguish true cysts from solid lesions?

    <p>Intravenous gadolinium-based contrast agent</p> Signup and view all the answers

    Which soft tissue tumor is the most common?

    <p>Lipoma</p> Signup and view all the answers

    How is the classic lipoma described in terms of composition?

    <p>Completely fatty without nodularity or septations</p> Signup and view all the answers

    Which imaging modality shows the lipoma as radiolucent and isointense relative to subcutaneous fat?

    <p>MR images with all pulse sequences</p> Signup and view all the answers

    Which lesion type may show blooming artifact on T2*-weighted gradient-echo MR images?

    <p>Phleboliths</p> Signup and view all the answers

    'Uniformly hyperintense lesion with signal intensity identical to subcutaneous fat' is seen on which MR image sequence?

    Signup and view all the answers

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