Analysis of operating field area in transpyramidal retrolabyrinthine approach to posterior cranial fossa.
Retrolabyrinthine surgical access to the posterior and middle cranial fossa has a long history of use during the procedures aiming at the removal of small neo-plasmatic changes located in the area of the internal auditory tube. A precise knowledge of the anatomical alterations of the temporal bone in the aspect of the retrolabyrinthine access to the posterior cranial fossa determines a successful otoneurosurgical endoscopy, which involves a relatively narrow area. Forty-four cadaver temporal bones of both sexes were measured to obtain the dimensions of the surgical area limited by the sigmoid sinus, superior petrosal sinus and posterior labyrinth. The techniques of computer picture analysis were applied in the research. The mean value of the surface area of the figure limited by the sigmoid sinus, superior petrosal sinus and posterior semicircular canal was 175.9 mm2 with no significant differences between sexes and sides. The maximal measured value was 356 mm2, and the minimal was 84.3 mm2. The size of the surgical area is characterised by large deviation range but was always sufficient to insert the endoscopic device and standard otosurgical instruments.
Department of Normal Anatomy, Medical University of Warsaw, Poland.
Stanisław
S
Nitek
Jarosław
J
Wysocki
Eliza
E
Brozek
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D003388:Cranial Fossa, Posterior / Q000033:anatomy & histology* / Q000601:surgery*; D007758:Ear, Inner / Q000033:anatomy & histology* / Q000601:surgery*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D013506:Otologic Surgical Procedures / Q000379:methods*; D010579:Petrous Bone / Q000033:anatomy & histology / Q000601:surgery; D013701:Temporal Bone / Q000033:anatomy & histology / Q000601:surgery