Morphometric study of Macewan’s Triangle in Relation to Depth of the Sigmoid Sinus Plate
Keywords:Henle’s spine, Suprameatal triangle, Mastoidectomy, Sigmoid sinus,
Background: The suprameatal triangle is used for approaching the tympanic cavity and also it is an important
landmark for otologic surgeons during mastoidectomy.
Aim: To determine the depth of sigmoid sinus plate over the Macewan’s triangle by morphometry of various
Materials & Methods: The study was carried out in the Department of Anatomy, Penang International
Dental College & VMKV Medical College, Salem on 30 dry human adult skulls. Five landmarks (D1,
D2, D3, D4, D5 and D6) were taken on the left and right sides of the skulls and the imaginary lines were
constructed and measured by Vernier caliper between the landmarks.
Results: The measurement of D2 showed statistically significant differences. The correlations of D1, D3,
D4, D5 and D6 on both sides do not show any significant differences. The linear correlation equations were
derived using the measurements for predicting D6.
Conclusion: The depth of sigmoid sinus plate (D6) can be assessed using D1, D2, D3, D4, D5 on lateral
view of head & neck X-rays which can be used by Otologist during mastoidectomy to avoid severe bleeding
complications from sigmois sinus.
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