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Öğe Analysis of the cranial aperture of the optic canal in patients with chiari type-i malformation(2024) Özalp, Hakan; Özgüral, Onur; Alpergin, Baran Can; İnceoğlu, Ayşenur; Özalp, Sibel; Armağan, Ercan; Uçar, Hadice; Beger, OrhanAIM: To examine the morphological properties of the cranial aperture of the optic canal (CAOC) in patients with a Chiari type-I malformation (CIM). MATERIAL and METHODS: Radiological images of 40 patients with CIM (24 females/16 males, mean age: 20.75 ± 14.98 years) and 40 normal individuals (24 females/16 males, mean age: 23.13 ± 18.89 years) were included in the study to assess the anatomical features of CAOC. RESULTS: The CAOC width (p=0.137), CAOC height (p=0.243), distance between the CAOC and the midsagittal line (p=0.982), and angle of the optic canal in the sagittal plane (Ang-in-SP) (p=0.598) were similar in patients with CIM and in the controls. The distances between the CAOC and the anterior (Dis-to-AB) and lateral (Dis-to-LB) boundaries of the anterior skull base were smaller in patients with CIM than in the controls (p<0.01). However, the angle of the optic canal in the axial plane (Ang-in-AP) was greater in patients with CIM than in the controls. Four different aperture shapes were identified in the CIM group (teardrop, n=42 [52.40%]; triangular, n=17 [21.30%]; oval, n=9 [11.30%]; and round, n=12 [15%]) and in the control group (teardrop, n=36 [45%]; triangular, n=14 [17.50%]; oval, n=10 [12.50%]; and round, n=20 [25%]). CONCLUSION: A greater Ang-in-AP and shorter Dis-to-LB and Dis-to-AB were found in patients with CIM than in the healthy controls. The distance measurements demonstrate that patients with CIM have a shorter and narrower anterior fossa than normal individuals.Öğe Analysis of the prechiasmatic sulcus in chiari malformation type I(Elsevier Science Inc., 2023) Özalp, Hakan; Özgüral, Onur; Alpergin, Baran Can; İnceoğlu, Ayşenur; Özalp, Sibel; Armağan, Ercan; Uçar, Hadice; Beger, OrhanOBJECTIVE: To assess morphologic features of the pre-chiasmatic sulcus (PS) in Chiari malformation type I (CM-I).-METHODS: Computed tomography images were ob-tained in patients with CM-1 (mean age: 21.26 & PLUSMN; 16.46 years; sex: 25 females and 17 males) and 58 healthy control subjects (mean age: 28.12 & PLUSMN; 22.60 years; sex: 29 females and 29 males). The following parameters were measured to determine the anatomy of the PS: planum length, sulcal length, sulcal angle (SA), and interoptic distance. Consid-ering sulcal length and SA measurements, 4 types of PS were identified: narrow-steep-groove (NSG), narrow-flat -groove (NFG), wide-steep-groove, and wide-flat-groove.-RESULTS: SA was greater in the CM-I group (32.80 & PLUSMN; 18.21 & DEG;) compared with the control group (23.05 & PLUSMN; 14.53 & DEG;) (P = 0.004), but the other parameters were similar in both groups. Distribution ranking of PS types was as follows: NFG (31%) > NSG (26.20%) > wide-steep-groove (23.80%) > wide-flat-groove (19%) in the CM-I group; wide-flat-groove (37.90%) > wide-steep-groove (20.70%) = NFG (20.70%) = NSG (20.70%) in the control group. Distribution rate of PS types relative to both groups showed that the classification system was not affected by CM-I (P = 0.226).-CONCLUSIONS: SA value was approximately 25% greater in the CM-I group than in the control group; thus, CM-I patients had more vertical groove. The percentage of narrow-type (NSG D NFG) PS in the CM-I group was higher than in the control group.Öğe Assessment of the anterior clinoid process and optic strut in chiari malformation type I: A computed tomography study(2024) Özalp, Hakan; Özgüral, Onur; Alpergin, Baran Can; İnceo?lu, Ayşenur; Özalp, Sibel; Arma?an, Ercan; Uçar, Hadice; Beger, OrhanObjective This study aimed to evaluate morphological features of the anterior clinoid process (ACP) and the optic strut (OS) in Chiari malformation Type I (CM-I). Methods The study universe consisted of computed tomography images of 41 CM-I patients and 45 normal subjects. Comparison of the parameters for CM-I and the control group was performed with the Student's t -test. A p < 0.05 was accepted as the significance level. Results ACP length was smaller in CM-I than the control group (p < 0.001). In contrast to ACP length, ACP angle (p < 0.001), OS length (p = 0.022), and the distance between ACP and OS (p = 0.020) were found greater in CM-I in comparison to the control group (p < 0.05). ACP width (p = 0.233) and OS width (p = 0.376) were similar in both groups. ACP pneumatization in CM-I group was found as 12.20%, whereas in the control group as 8.90%. Two different types about the pneumatization were identified in CM-I group (Type 1: 4.9% and Type 2: 7.3%), whereas three different types in the control group (Type 1: 3.3%, Type 2: 4.4%, and Type 3: 1.1%). Relative to ACP, three different types about OS position were identified in CM-I group (Type C: 31.70%, Type D: 64.60%, and Type E: 3.70%) and the control group (Type C: 7.80%, Type D: 64.40%, and Type E: 27.80%). Conclusion Shorter ACP, wide-angled ACP, longer OS, and more anteriorly located OS were found in CM-I group compared with the normal group. Our findings showed that the pneumatization of ACP was not affected by CM-I.Öğe Evaluation of the sella morphology in chiari malformation type ı(2025) Özalp, Hakan; Özgüral, Onur; Alpergin, Baran Can; İnceoğlu, Ayşenur; Özalp, Sibel; Armağan, Ercan; Beger, OrhanAIM: To investigate the morphology of sella turcica (ST) in Chiari malformation type I (CM-I) using computed tomography. MATERIAL and METHODS: The size and shape of ST were examined using the radiological images of 32 CM-I patients (21 female/11 male, mean age: 26.09 ± 15.39 years), and 32 normal participants (19 female/13 male, mean age: 28.56 ± 19.37 years). RESULTS: The height, diameter, width, and length of ST were similar in CM-I and control groups (p>0.05). According to the Axelsson classification, the ST shape in CM-I was identified as normal in 16 patients (50%), oblique anterior wall in 2 patients (6.25%), irregularity in 6 patients (18.75%), and pyramidal shape of the dorsum sellae in 8 patients (25%). In controls, the ST shape was identified as normal in 18 patients (56.25%), oblique anterior wall in 4 patients (12.50%), irregularity in 2 patients (6.25%), and pyramidal shape of the dorsum sellae in 8 patients (25%). According to the Camp classification, the ST shape in CM-I was identified as oval in 6 patients (18.80%), round in 21 patients (65.60%), and flattened in 5 patients (15.60%). In controls, the ST shape was identified as oval in 19 subjects (59.40%), round in 10 patients (31.30%), and flattened in 3 patients (9.40%). CONCLUSION: The size of ST in patients with CM-I was similar to that in healthy partcipants. The only difference in ST morphology was that patients with CM-I had more round-shaped sella, whereas normal subjects had more oval-shaped sella.
