[Diagnostic value of ENG in occupied lesions of cerbellopontine angle].

OBJECTIVE

To evaluate the diagnostic value of ENG in occupied lesions of cerebellopontine angle.

METHOD: Twenty-four cases of pathological confirmed occupied lesions of cerebellopontine angle were examined with ENG before operation. The ENG examination included saccade test, gaze test, ocular pursuit test, optoknetic test, positional test and positioning test.

RESULT: ENG tests were compared with the results of operation and pathology. The results showed that abnomal ENG-OKR suggested central lesions. Brun's nystagmus and unilateral canal paresis were of important value in locating the lesions of cerebellopontine angle. The ocular pursuit test and optokinetic test could point out which side the lesions were.

CONCLUSION

Patients with cerebellopontine angle lesions smaller than 3 cm in diameter showed unilateral canal paresis in caloric test indicated acoustic neuroma. Patients with cerebellopontine angle lesions showed no canal paresis may be other lesions except acoustic neuroma.