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American Journal of Roentgenology, Vol 101, 195-201, Copyright © 1967 by American Roentgen Ray Society

IMPORTANCE OF THE PETRO-SAGITTAL (PETRON) ANGLES

IN DIAGNOSTIC ROENTGENOGRAPHY

HAROLD J. PEGGS M.D.1

1 SANTA CLARA, CALIFORNIA

Human skulls differ so widely that it is reasonable to assume that no 2 are exactly alike.

The variations of the anterior petron angles (petro-sagittal) varied from 72° to 145°—a 73° spread in this series. In a single skull the anterior petron angles varied as much as 48° apart. In another skull the posterior petron angles varied as much as 33°. In not 1 case of 1,009 did we find the anterior angles equal at the same time the posterior angles were equal. In only 5 of 1,009 did we find either the anterior or the posterior petron angles equal.

With such a wide spread possible, and with such a known and expected asymmetry in nearly every skull, a simple approach to the solution is to find where the petrons (petrous portions of the temporal bones) will be in the patient under study. Direct measurement off a Hintz basilar skull projection is recommended. Adjusting of the facial angle prior to roentgen study is necessary.


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Copyright © 1967 by the American Roentgen Ray Society.