This study was undertaken to determine the morphometry of the piriform aperture width and height in Turkish population aged between 18-60 years. It was a retrospective study in which 200 subjects were included 106 males and 94 females, ranging from 18 up to 60 years. Subjects having brain CT in the Radiology Department. Statistical analysis were evaluated with SPSS 21.00 programme. ANOVA Test were used to determine the significance between measurements and age group. The p<0.05 value was considered as significant. The groups were divided into four groups according to age. The overall means and standard deviations of the measurements were: piriform aperture height, 45.19 +/- 2.91 mm; piriform aperture width, 24.98 +/- 2.85 mm; the golden ratio, 1.84 +/- 0.19 in males, respectively whereas, the same measurements were 42.84 +/- 2.88; 23.46 +/- 2.15 mm; 1.83 +/- 0.19 in females, respectively. Also there were an increase in piriform aperture width measurement as the age increased. These anatomical values provides more important knowledge to determine the dimensions of these structures in clinic, surgical processes.