Bacterial meningoencephalitis with very low leucocyte count in the cer
ebrospinal fluid (CSF) (''apurulent' meningitides) is uncommon and car
ries a severe prognosis. We report a case of apurulent meningitis as t
he heralding syndrome of bacterial endocarditis. A 55-year-old men pre
sented with headache, confusion and nuchal rigidity. The CSF contained
13 cells and masses of streptococci. CSF protein was markedly increas
ed. Two presumably embolic cerebral infarctions developed. A systolic
murmur not present at admission was noted, and the diagnosis of endoca
rditis was confirmed by echocardiography. After a complicated course,
the patient recovered almost completely. Endocarditis as the underlyin
g cause in a patient presenting with meningitis may be easily overlook
ed because symptoms and laboratory findings show considerable overlap.
We conclude that if endocarditis is suspected, all CSF samples must b
e examined microscopically and by culture even in those cases that mig
ht be labelled ''aseptic'' by the cell count alone. If vascular compli
cations compatible with embolic infarctions develop in a patient with
bacterial meningitis, transesophageal echocardiography should be consi
dered.