Post-mortem examination of the heart showed pericarditis, focal myocarditis and prominent endocardial and interstitial fibrosis.
[doi.org]
[…] unexplained white matter changes on brain imaging inflammatory arthritis affecting 1 or more joints that may be fluctuating and migratory cardiac problems, such as heart block or pericarditis
[nice.org.uk]
[…] syndrome), meningitis, peripheral facial palsy, encephalitis, myelitis, cerebral arteritis, multiple erythemas, arthritis, myalgia, borrelial lymphocytoma, myositis, myo- or pericarditis
[doi.org]