A US woman who underwent COVD-19 nasal swab test got her brain's lining punctured, leading to her brain fluid leaking into nose, according to a case reported in peer-reviewed journal JAMA Otolaryngology-Head & Neck Surgery. The woman, in her 40s, developed unilateral rhinorrhea, headache and vomiting. She had an undiagnosed skull defect that causes brain's lining to protrude into nose.