Chorioamnionitis

Disease Description (Causes and Symptoms)

• Definition: An infectious disease in which a pus-filled lesion (abscess) forms within the brain tissue.
• Causes and pathophysiology:
  • Sources of infection: Occurs through contiguous spread of a local infection (otitis media, sinusitis, etc.) or hematogenous dissemination (endocarditis, pulmonary infection, distant infection).
  • Major pathogens: Streptococci, staphylococci, and anaerobic bacteria (increasing recently); in some cases, polymicrobial infection.
  • Risk factors include immunosuppression, heart disease (endocarditis, congenital heart disease), and chronic infections of the head, sinuses, or middle ear.
• Major symptoms:
  • Headache (gradually worsening), fever (low-grade to high fever), nausea and vomiting, personality and behavioral changes, focal neurological deficits (such as hemiplegia), seizures (convulsions), and neck stiffness (rarely).
  • Symptoms vary depending on the size and location of the abscess.

Treatment Methods

• Diagnostic principles (linked to treatment):
  • Imaging tests (CT or MRI) are most important. If ventricular enlargement or signs of increased intracranial pressure are present, lumbar puncture (cerebrospinal fluid testing) is generally contraindicated because of the risk of brain herniation.
  • If necessary, aspiration or biopsy of the abscess is performed for culture to determine antibiotic susceptibility.
• Antibiotic treatment:
  • If the causative organism is identified, targeted antibiotics are administered according to susceptibility results.
  • If the causative organism is not identified, empirical broad-spectrum antibiotics (e.g., a third-generation cephalosporin + metronidazole ± vancomycin) are started and adjusted according to the culture results.
  • Intravenous antibiotics are generally used for at least 6–8 weeks; the duration may be extended depending on the lesion size and clinical response.
• Surgery and procedures:
  • Percutaneous (stereotactic) aspiration: Performed to decompress and culture an encapsulated abscess; repeated aspiration may be possible.
  • Surgical excision: Considered when the abscess is large (mass effect), multiloculated, does not improve with antibiotics or aspiration, or is easily accessible.
  • The decision to operate takes into account the location, size, and the patient's condition (level of consciousness and anesthesia risk).
• Supportive treatment:
  • If seizures occur, anticonvulsants are administered; long-term medication may be considered if necessary.
  • If cerebral edema or increased intracranial pressure is severe, steroids (used cautiously) and intracranial pressure management may be required.
  • Intensive care and rehabilitation therapy (for the purpose of recovering neurological deficits).
• Precautions (points to note during treatment):
  • Lumbar puncture is contraindicated when increased intracranial pressure or a focal lesion is suspected.
  • Immunocompromised patients, patients with multiple abscesses, and those with intraventricular rupture have a high risk of poor prognosis and require aggressive treatment.
  • Neurological sequelae (seizures, cognitive or motor impairment, and personality changes) may remain even after treatment, so follow-up is necessary.

Checklist Before an Outpatient Visit (Including Recommended Items and Example Questions)

• Recommended items to bring:
  • A list of currently taken medications (including prescription drugs, nonprescription drugs, and supplements) and a record of medication allergies
  • Previous test results or imaging (CD or reports)
  • A recent history of infections (otitis media, sinusitis, dental infections, cardiac infections, etc.) and treatment history
  • The time symptoms began and their progression (temperature records, whether seizures occurred, areas of weakness, etc.)
  • A history of underlying conditions (heart disease, diabetes, immunosuppressive treatment, etc.) and smoking, alcohol, and drug use
• Information to provide to the doctor at the outpatient visit (examples of questions the patient should prepare to answer):
  • When did the symptoms begin? (Daily or hourly progression)
  • Have you recently been diagnosed with an ear, nose, dental, or chest infection or endocarditis?
  • Have you recently taken antibiotics or immunosuppressants?
  • Have you had any seizures (convulsions)? Do you have the results of imaging tests (C/T, MRI)?
  • Are there decreased consciousness, severe headache, repeated vomiting, or acute neurological deficits?

Examples of General Questions to Ask the Doctor

• What are the possible side effects of this medication (antibiotic)?
• Is hospitalization necessary? Approximately how long will the hospital stay be?
• How long will the antibiotic treatment last, and how will regular monitoring (imaging tests) be conducted?
• How should seizures be managed if they occur, and are anticonvulsants necessary (including whether they need to be taken long term)?
• What is the long-term prognosis, and how likely are neurological sequelae?

Examples of Disease-Specific Questions

• "What source does my abscess appear to have originated from (otitis media, sinusitis, endocarditis, hematogenous spread, etc.)? What tests are needed to identify the cause?"
• "In my case, are the conditions for recommending aspiration (or excision) met? What are the risks of surgery and the expected benefits?"