Case Report Links Nasal Swab to Fluid Leak
A 49-year-old patient developed symptoms of a cerebrospinal fluid leak after receiving a COVID-19 test.
Updated on Oct. 30, 2026 in COVID-19
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Physicians have documented a case where a 49-year-old woman experienced a headache and clear nasal drainage following a deep COVID-19 swab. The patient, who had a history of idiopathic intracranial hypertension, sought emergency care for neurological symptoms.
Why it matters
This case highlights potential risks of nasal testing in individuals with pre-existing skull base abnormalities. The deep swabbing procedure may trigger drainage if underlying bone thinning is present.
Medical literature now cites 15 to 17 documented cases of cerebrospinal fluid leaks following nasal swabs. The 49-year-old patient experienced symptom resolution within 24 hours after receiving conservative treatment without surgery.
The players
SAGE Open Medical Case Reports
This is a peer-reviewed academic journal that publishes medical case reports across a variety of clinical specialties.
William Beaumont Army Medical Center
Located in El Paso, Texas, this medical facility provides healthcare services to military personnel and their families.
HCA Houston Healthcare Clear Lake
This is a healthcare provider located in Webster, Texas, that offers a wide range of emergency and surgical services.
The details
A CT scan revealed subtle bone thinning in the patient's skull base, which researchers believe increased her vulnerability to injury from the nasopharyngeal swab. While the patient exhibited blurry vision and nausea, doctors successfully managed her condition without surgical intervention.
Timeline
March 2020: A Czech patient undergoes a nasal swab.
2020: The first widely reported cerebrospinal fluid leak case occurs.
December 2020: The Czech patient seeks medical care for their injury.
May 2021: The testing period for the Czech case review concludes.
July 8, 2026: The case report is published in SAGE Open Medical Case Reports.
The Big Picture
This case follows a pattern established by the 2021 Czech Republic cribriform plate injury case. It highlights that while nasal swabbing is a routine procedure, it can carry rare risks for individuals with specific pre-existing anatomical vulnerabilities.
Patients with a history of intracranial hypertension or skull base abnormalities should inform medical staff before undergoing nasopharyngeal procedures. While complications remain extremely rare, those experiencing persistent drainage or severe headaches after testing should seek medical evaluation.
The takeaway
Though nasal testing is safe for the vast majority of people, those with known neurological conditions should be aware of rare risks. Monitoring for unusual post-test symptoms like persistent clear drainage or severe headaches can help ensure timely clinical care.
Further reading
Find more clinical updates and guidance on COVID-19.
Source note: This article includes information reported by Medical Daily.
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If you have a history of skull conditions, would you request a shallower nasal test?
