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Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282X

Arq. Neuro-Psiquiatr. vol.47 no.2 São Paulo June 1989

http://dx.doi.org/10.1590/S0004-282X1989000200016 

Bonnet syndrome and posterior parasagittal tumor: clues to neural, mechanisms

 

Síndrome de Bonnet e tumor parassagital posterior: indícios dos mecanismos neurais

 

 

S. A. Ribeiro; R. Oliveira-Souza; H. Alvarenga

Serviço de Neurologia, Hospital Universitário Gaffrée e Guinle, Universidade do Rio de Janeiro (UNI-RIO)

 

 


SUMMARY

A case of Bonnet syndrome associated with blindness due to bilateral eye disease and a posterior parasagittal meningioma is reported. It is assumed that visual afferent deprivation alone is not enough to produce the syndrome and that, in most instances, a 'cerebral factor' must be operative if hallucinoses are to occur. The distinction between hallucinosis and hallucinations is favored and a common neural circuit for the mediation of hallucinotic imageries in general is suggested. One should not immediately put the blame on obvious eye or visual pathways affections when facing cases of Bonnet syndrome, as they are not likely to explain the complex array of images perceived by any given patient. On the contrary, the possibility of a clinically covert intracranial disease should be always raised and intensively looked for.


RESUMO

Relatamos o caso de um paciente com síndrome de Bonnet com cegueira ocasionada por doença ocular bilateral e meningeoma parassagital posterior. Admite-se que, isoladamente, a deprivação visual aferente é insuficiente para produzir a síndrome e que, na maior parte dos casos, um 'fator cerebral' deve operar para que a alucinose aconteça. Favorecemos a distinção entre alucinose e alucinação e sugerimos que um circuito neural comum medeie as imagens alucinóticas de modo geral. Não parece prudente responsabilizar de imediato afecções oculares ou ópticas óbvias quando diante de casos de síndrome de Bonnet, pois, provavelmente, não justificarão as imagens complexas percebidas pelo paciente. Ao contrário, deve-se investigar exaustivamente a possibilidade de doenças intracranianas clinicamente inaparentes.


 

 

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

 

 

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