The value of VEP in the diagnosis and post-operative monitoring of Pituitary macro-adenoma

Original Article Pattern reversal Macro adenoma P100 latency Visual evoked Potentials (VEPs) to checkerboard pattern reversal were recorded from a patient with complaints of severe and sudden headache and unexplained unilateral diminution of vision over 2 years. Since the VEP recordings showed markedly delayed response and severely reduced amplitude of P100 wave form from the left eye, a compressive lesion of the optic nerve was suspected. Computerized tomographic scan gave the evidence of suprasellar extension of pituitary macroadenoma. Follow-up recording of PVEP helped in better and cost effective assessment of visual function of the subject post-operatively.