然而，延髓症状在发病初期并不常见，两位有症状的患者几乎完全为锥体系受累表现另外两位患者无症状。
Bulbar symptoms, however, were infrequent at onset and two symptomatic patients had an almost pure pyramidal involvement. Two subjects were asymptomatic.
BD临床特征：进行性加重的智能衰退，定向力障碍及人格改变，假性延髓麻痹征，锥体系及锥体外系损害的表现。
The clinical features of BD was gradual decline of brainpower, orientation obstacle, characteristic changes, pseudobulbar palsy, manifestation of pyramidal and extrapyramidal motor system damages.
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