Propionibacterium encephalitis [Letter to the editor]

To THE EDITOR: We read with interest the article by Camarata, et al., reporting two cases of dorsal midbrain encephalitis (Camarata PJ, McGeachie RE, Haines S J: Dorsal midbrain encephalitis caused by Propionibacterium aches. Report of two cases. J Neurosurg 72." 654-659, April, 1990). There are several points in the article which lead us to believe that, in the absence of histological proof, the Author's are too presumptive in their conclusions as to the nature of these lesions. However, we do acknowledge that the Author's consider focal tectal neoplasms as a possible but unlikely diagnosis.