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Related Experiment Videos

Transsphenoidal hypophysectomy in the dog. A new technique.

G W Niebauer1, S M Evans

  • 1Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia.

Veterinary Surgery : VS
|November 1, 1988
PubMed
Summary

This study presents a novel technique for accurately locating the canine hypophysis (pituitary gland) using radiographic markers and anatomical landmarks. The method proved effective in precisely centering surgical openings for hypophysectomy in most dogs.

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Area of Science:

  • Veterinary Neurosurgery
  • Comparative Anatomy
  • Surgical Techniques

Background:

  • Accurate localization of the canine hypophysis is crucial for surgical procedures like hypophysectomy.
  • Existing methods may be limited by variations in canine skull morphology.
  • A reliable technique is needed to overcome anatomical variability in dogs.

Purpose of the Study:

  • To evaluate a new technique for localizing the canine hypophysis.
  • To assess the accuracy of the technique regardless of dog skull shape or size.
  • To determine the efficacy of the technique in guiding hypophysectomy.

Main Methods:

  • Utilized known anatomical landmarks to estimate the hypophysis location.
  • Placed three radiographic markers (self-threading screws) in the sphenoid bone.

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  • Performed a cranial sinus venogram to outline the hypophysis via the cavernous sinus.
  • Centered a circular ostectomy over the hypophysis using screw markers.

    • Main Results:

    • The technique was evaluated in eight dogs under a nonsurvival protocol.
    • Complete hypophysectomy was achieved in seven out of eight dogs.
    • Ostectomy sites were precisely centered over the hypophysis in successful procedures.

    Conclusions:

    • The described technique allows for accurate localization of the canine hypophysis.
    • This method is adaptable to variations in canine skull anatomy.
    • The technique facilitates precise centering of ostectomies for hypophysectomy.