MRI Findings in Acute Osteomyelitis
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Questions and Answers

What radiographic feature is typically seen in acute osteomyelitis?

  • Periosteal reaction (correct)
  • Chronic sclerotic changes
  • Endosteal scalloping
  • Central necrosis

    • Which MRI finding is characteristic of acute osteomyelitis?

  • Decreased signal in the medullary cavity
  • High signal intensity on STIR images (correct)
  • Low signal intensity on T1-weighted images
  • Enhancement of the bony trabeculae

    • What is the term for a sequestrum in chronic osteomyelitis?

  • Sclerosis of the cortex
  • Dead, devascularized bone (correct)
  • Area of new bone formation
  • Pus-filled cavity

    • Which imaging modality is preferred for evaluating bony changes in chronic osteomyelitis?

    <p>CT scan (C)</p> Signup and view all the answers

    What radiographic finding suggests chronic osteomyelitis rather than an acute presentation?

    <p>Peripheral sclerosis (A)</p> Signup and view all the answers

    What is the primary etiological agent responsible for acute osteomyelitis in infants?

    <p>Bacterial infection (C)</p> Signup and view all the answers

    Which imaging feature is more likely to be observed in chronic rather than acute osteomyelitis?

    <p>New bone apposition (B)</p> Signup and view all the answers

    In acute osteomyelitis, which long bones are most commonly affected due to poor nutrition and unhygienic surroundings?

    <p>Femur (C)</p> Signup and view all the answers

    In plain radiography for acute osteomyelitis, what must be compromised for noticeable changes to appear?

    <p>Fat planes (D)</p> Signup and view all the answers

    What imaging modality is particularly useful in the early detection of changes in osteomyelitis compared to plain radiography?

    <p>Magnetic Resonance Imaging (MRI) (A)</p> Signup and view all the answers

    What are sequestrum and involucrum commonly associated with in the context of chronic osteomyelitis?

    <p>Bone necrosis and new bone formation (C)</p> Signup and view all the answers

    Which of the following is NOT a predisposing factor for osteomyelitis as mentioned in the text?

    <p>Elevated platelet count (B)</p> Signup and view all the answers

    Which imaging modality is considered most sensitive and specific for identifying soft tissue/joint complications in acute osteomyelitis?

    <p>MRI (B)</p> Signup and view all the answers

    What does the bone marrow signal look like on T1-weighted images in acute osteomyelitis?

    <p>Low signal (D)</p> Signup and view all the answers

    What is a sequestrum in the context of osteomyelitis?

    <p>A piece of devitalized bone separated from surrounding bone (D)</p> Signup and view all the answers

    Which imaging modality is superior to MRI and plain film for depicting bony margins and identifying a sequestrum or involucrum in osteomyelitis?

    <p>CT scan (D)</p> Signup and view all the answers

    What are the overall sensitivity and specificity percentages of CT imaging in chronic osteomyelitis according to the text?

    <p>67% sensitivity, 50% specificity (B)</p> Signup and view all the answers

    What does a sequestrum represent in the context of CT imaging in osteomyelitis?

    <p>Piece of devitalized bone separated from surrounding bone (C)</p> Signup and view all the answers

    What is the hallmark of chronic osteomyelitis?

    <p>Infected dead bone within a compromised soft tissue envelope (D)</p> Signup and view all the answers

    What is the function of a cloaca in osteomyelitis?

    <p>To provide a pathway for drainage of purulent and necrotic material (A)</p> Signup and view all the answers

    What is the function of an involucrum in osteomyelitis?

    <p>To prevent infection from spreading to surrounding tissues (A)</p> Signup and view all the answers

    What is the purpose of a sinus tract in chronic osteomyelitis?

    <p>To provide an opening for drainage to the skin surface (B)</p> Signup and view all the answers

    Which imaging technique is useful in identifying a sequestrum in osteomyelitis?

    <p>Computed Tomography (CT) (C)</p> Signup and view all the answers

    In acute osteomyelitis, what is characteristic of a cloaca?

    <p>Forms at the site of the initial infection (A)</p> Signup and view all the answers

    What is the radiological finding known as involucrum in chronic osteomyelitis?

    <p>Cortical thickening representing periosteal new bone formation (A)</p> Signup and view all the answers

    Which radiological finding is characteristic of Brodie abscess?

    <p>Oval configuration lytic lesion surrounded by reactive sclerosis (B)</p> Signup and view all the answers

    What is the likely diagnosis in a patient with a sclerosing lesion with a thick rim of ossification on MRI imaging?

    <p>Sclerosing osteomyelitis of Garre (C)</p> Signup and view all the answers

    What does a sequestrum represent in the context of osteomyelitis?

    <p>Separate sclerotic fragment of bone (D)</p> Signup and view all the answers

    Which imaging modality best demonstrates a sclerotic fragment of bone separate from the rest of the humerus in chronic osteomyelitis?

    <p>Coronal CT with bone windows (B)</p> Signup and view all the answers

    What would an oval configuration lytic lesion oriented along the long axis of the bone surrounded by a thick dense rim most likely represent on imaging?

    <p>Brodie abscess in subacute pyogenic osteomyelitis (D)</p> Signup and view all the answers

    Which symptom is commonly associated with Stage I osteonecrosis?

    <p>Osteopenia (D)</p> Signup and view all the answers

    What is the classic 'Crescent sign' seen in Stage III osteonecrosis indicative of?

    <p>Subchondral lucency and collapse (A)</p> Signup and view all the answers

    Which imaging technique confirms the presence of sequestrum and involucrum in osteomyelitis?

    <p>X-rays (D)</p> Signup and view all the answers

    At which stage of osteonecrosis does the shape of the femoral head remain preserved?

    <p>Stage IIIa (C)</p> Signup and view all the answers

    What imaging evidence suggests AVN in later stages like Stages IV and V of osteonecrosis?

    <p>Arthritic changes (C)</p> Signup and view all the answers

    Which condition may Stage VI osteonecrosis become indistinguishable from?

    <p><strong>Osteoarthritis</strong> (B)</p> Signup and view all the answers

    What is the most common bone affected by osteonecrosis?

    <p><strong>Femoral head</strong> (A)</p> Signup and view all the answers

    Sclerosis, subchondral cysts, and osteopenia are common findings in which stage of osteonecrosis?

    <p><strong>Stage II</strong> (B)</p> Signup and view all the answers

    Which imaging technique is abnormal in Stage I osteonecrosis?

    <p><strong>MRI</strong> (B)</p> Signup and view all the answers

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