Botulism CT
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Botulism Microchapters |
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Diagnosis |
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Treatment |
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Case Studies |
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Botulism CT On the Web |
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American Roentgen Ray Society Images of Botulism CT |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Michael Maddaleni, B.S., Keanu Ngo[2]
Overview
There are no computed tomography (CT) findings diagnostic of or specific to botulism, because the neurotoxin acts at the peripheral presynaptic neuromuscular junction and does not cross the blood–brain barrier; the brain parenchyma is structurally normal. CT is therefore used not to confirm botulism but to exclude structural mimics—particularly brainstem (pontine) infarction, intracranial hemorrhage, and posterior-fossa mass lesions—that can produce overlapping cranial-nerve and bulbar findings. A normal CT is the expected result and supports, rather than refutes, the diagnosis.[1][2]
CT scan
There are no CT findings diagnostic of or specific to botulism. In the CDC series of 332 U.S. cases (>12 months of age), neuroimaging showed no acute changes in 82% of patients; results of brain imaging are characteristically normal.[1][3][4]
The role of CT is exclusionary:
- Non-contrast head CT is fast and widely available and is used first to exclude intracranial hemorrhage and large territorial stroke.[2]
- Because CT images the posterior fossa poorly, MRI is performed subsequently (time permitting) to evaluate the brainstem when a vascular or inflammatory brainstem lesion remains a concern.[2]
- The AAP Red Book notes that brain imaging may help to exclude strokes or some inflammatory conditions.[5]
Diagnosis remains clinical, confirmed by toxin/organism detection and supported by electrodiagnostic testing; imaging is adjunctive and must never delay antitoxin when botulism is clinically suspected.[5][6]
References
- ↑ 1.0 1.1 Rao AK; Lin NH; Jackson KA; Mody RK; Griffin PM (2017). "Clinical Characteristics and Ancillary Test Results Among Patients With Botulism—United States, 2002-2015". Clinical Infectious Diseases. PMID 29293936.
- ↑ 2.0 2.1 2.2 Schreck KC; Schneider L; Geocadin RG (2015). "Clinical Reasoning: A 44-Year-Old Woman With Rapidly Progressive Weakness and Ophthalmoplegia". Neurology.
- ↑ Martin CO; Adams HP (2003). "Neurological Aspects of Biological and Chemical Terrorism: A Review for Neurologists". Archives of Neurology.
- ↑ David WS; Temin ES; Kraeft JJ; Hooper DC (2015). "Case Records of the Massachusetts General Hospital. Case 3-2015". The New England Journal of Medicine. PMID 25607430.
- ↑ 5.0 5.1 American Academy of Pediatrics (2024). Botulism and Infant Botulism (Clostridium botulinum). Red Book: 2024–2027 Report of the Committee on Infectious Diseases.
- ↑ Kuehn BM (2021). "Botulism Guidelines Aim to Help Prepare Clinicians for Outbreaks". JAMA. 325 (24): 2428. doi:10.1001/jama.2021.8969.