Anatomia das regiÃes selar e perisselar: estudo por ressonÃncia magnÃtica

AUTOR(ES)

Tiago Freitas Lins Pimentel

DATA DE PUBLICAÇÃO

2007

RESUMO

Introduction: The anatomy of sellar and perisellar region is complex and has a great range within the normality. Magnetic resonance image is the most used technique to show this. Objective: The aim of this study is to evaluate the size, shape and range of some sellar and perisellar structures with MRI. Methods: MRI from 56 volunteers (21 male and 35 female subjects, age range 12 to 75 years), without neurological disease, were used to examine the pituitary gland, height and length; the optic chiasm thickness, width and position; intra-cavernous carotid distances; shape of the sphenoid sinus and the distance from the nose to the anterior wall of the sphenoid sinus and hypophysis. A Signa Infinity (GE) scanner, were used in all exams. The image protocol includes T1 and T2 weighted images, a T1 dynamic and T1 pos-contrast, with section thickness of 2 mm. Results: The pituitary gland height mean was 6.1 Â 2.2 mm. The average of chiasm-tubercle distance was 6 Â 1.7 mm and the chiasm fixation distance varied between 0 to 9 mm (mean 4.2 Â 2.2 mm). The chiasm thickness average was 2 Â 0.3 mm. The mean of chiasm width from males was 14.8 Â 1.64 mm and females 13.6 Â 1.3 mm (p<0.01). The average of the carotid arteries (cavernous segment) distance was 15.8 Â 4.4 mm. The sellar type of sphenoid pneumatization was the most frequent variety (62%) between women. Men had the sellar type in 48% and pos-sellar types in 52%. The sphenoid sinus width average was 23.7 Â 11.3 mm (ranged 0 to 52 mm) and had a negative correlation with the age parameter (r=0.362). Conclusion: In women the sellar sphenoid sinus type was the most frequent. Men had a similar distribution between the sellar and pos-sellar types. The sphenoid width tended to decrease with aging. The optic chiasm show a little but significant difference between males and females subjects. The nose-pituitary and nose-sphenoid distance were greater in men.

ASSUNTO(S)

artÃria carÃtida interna sela tÃrcica quiasma Ãptico imagem por ressonÃncia magnÃtica seio esfenÃide anatomia hipÃfise neurocirurgia

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