I read with interest the article by Strausset al 1 on postoperative contralateral hearing loss which developed on the third day after microvascular decompression for trigeminal neuralgia. They attributed the symptoms to venous congestion at the ipsilateral inferior colliculus after dissection of the pontotrigeminal vein, which was documented by MRI. Symptoms resolved partially after intravenous rheologic medication for a total of 19 days. The authors' explanation for the delayed postoperative hypacusis, however, merits further discussion. Strauss et al 1provided preoperative and postoperative recordings of brain stem auditory evoked potentials: postoperatively, after stimulation on the operated side, ipsilateral waves I through V, and contralateral waves II through V are all clearly identifiable, contrasting with stimulation on the non-operated side, depicting only a small wave V bilaterally, but no other …