• Arq Neuropsiquiatr · Mar 2006

    Case Reports

    Seesaw nystagmus caused by giant pituitary adenoma: case report.

    • Frederico Castelo Moura, Allan Christian Pieroni Gonçalves, and Mário Luiz Ribeiro Monteiro.
    • Division of Ophthalmology, Hospital das Clínicas, University of São Paulo Medical School, São Paulo, SP, Brazil. fredcastelo@terra.com.br
    • Arq Neuropsiquiatr. 2006 Mar 1; 64 (1): 139-41.

    AbstractGiant pituitary adenomas are uncommonly large tumors, greater than 4 cm in size that can produces endocrine symptoms, visual loss and cranial nerve palsies. We report the rare occurrence of seesaw nystagmus as the presenting sign of giant pituitary adenoma. A 50-year-old man presented with headache associated with visual loss and seesaw nystagmus. Perimetry revealed bitemporal hemianopia and magnetic resonance imaging showed a giant pituitary adenoma. After surgery, nystagmus disappeared. Our case is relevant in understanding its pathogenesis since it documents seesaw nystagmus in a patient bitemporal hemianopia due to a large tumor but without mesencephalic compression.

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