Structurally, the petrous portion of the temporal bone may be pneumatic or diploic. Either type can be recognized on the roentgenogram. As the pneumatic petrous pyramid is the one under discussion, the title of this symposium1 might properly be "Suppuration of the Pneumatic Petrous Pyramid."
"Petrositis," "apicitis" and "suppuration of the petrous pyramid" are general terms and are applicable to an infection of a petrous pyramid of any structural type. These terms should not be applied to the clinical entity which Dr. Kopetzky described, except in a general way. The proper designation for the lesion in question is "acute coalescent petrositis" or "empyema of the petrous apex with inadequate drainage."
Roentgenographically, the petrous pyramid in any acute or chronic otitic infection shows a change from the normal—either a diminution in aeration due to congestion of the membrane lining the air cells or an increase in density due to productive
TAYLOR HK. SUPPURATION OF THE PETROSAL PYRAMIDROENTGENOLOGIC PROBLEMS. Arch Otolaryngol. 1933;18(4):458–463. doi:10.1001/archotol.1933.03580060490005