A 58-year-old woman with metastatic adenocarcinoma of unknown primary developed headache, confusion and bilateral cortical blindness of acute onset. This was followed shortly by two episodes of generalised seizures. She last received chemotherapeutic treatment with epirubicin, oxaliplatin and capecitabine two months previously. She had no other significant past medical history and was not on any medications. Blood pressure was within normal limits and her laboratory tests were unremarkable. A magnetic resonance imaging of her brain was performed (figure 1).
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