[Course of the visual evoked potentials in intracranial tuberculous granuloma].

The case in study is a 13-year-old male with tubercular granuloma in the optic chiasma, affecting the right optic nerve and causing temporary loss of vision in that eye. Evoked visual potentials are performed and a first examination reveals that loss of vision was preceded by an alteration of response through the right optical path. The physiopathology is discussed and an evolutionary study of the lesion is made, evaluating the usefulness of EVPs in the diagnosis and follow-up in these patients.