Postencephalitic muscular rigidity is not an uncommon occurrence and is seen most frequently in the parkinsonian states. Here it manifests itself as a mild to severe from of hypertonia with poverty of movement, relative motor weakness, parkinsonian attitude and other characteristics pointed out recently by Wilson.1 Occasionally, however, the rigidity that occurs after epidemic encephalitis is of such extreme degree as to make it the outstanding feature; it is as an illustration of this that our case is reported, the rigidity closely simulating decerebrate rigidity. In addition, the absence of pathologic reports in these cases makes such records desirable.
That marked rigidity may occur as a sequel of other organic diseases than encephalitis has already been demonstrated both clinically and pathologically. Antheaume and Trepsat,2 in 1920, reported a case of general paralysis in a patient, aged 43, with catatonia, cataleptic states and stereotypy. In 1923, Urechia and Elekes
WEISENBURG TH, ALPERS BJ. DECEREBRATE RIGIDITY FOLLOWING ENCEPHALITISREPORT OF A CASE WITH NECROPSY. Arch NeurPsych. 1927;18(1):1-15. doi:10.1001/archneurpsyc.1927.02210010004001