Anterior Clinoid Process and Optic Strut- A Morphometric Study

Gupta, Neha; Priya, Abhilasha

doi:10.14260/jemds/2018/803

Cited by 6 publications

(14 citation statements)

References 8 publications

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“…These average values were compatible with adult data range (5.30-12.50 mm for the length, 5.60-12.40 mm for the width, 39.67-42.09 degrees for the angle) in the literature (Supplementary Table 9, Supplemental Digital Content 9, http:// links.lww.com/SCS/E320). 13,15,[19][20][21]23,24,[31][32][33][34][35][36][37][38][39][40][41] Our mean width and length values were greater than fetal values (4.65 ± 0.94 mm for the width, 3.67 ± 0.82 mm for the length) reported by Beger et al, 19 but the mean angle value in this study was smaller than that (59.57 ± 8.03 degrees) in their study. 19 Therefore, we think that the length and width of ACP increase after birth up to adulthood, while its angle narrows.…”

Section: Discussioncontrasting

confidence: 72%

Change in the Location of the Optic Strut Relative to the Anterior Clinoid Process Pneumatization

Adanır¹,

Ceylan

İnceoğlu³

et al. 2022

Journal of Craniofacial Surgery

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Objective: This study aimed to peruse the alteration of the position of the optic strut (OS) according to the anterior clinoid process (ACP) pneumatization. Methods: This retrospective study conducted on cone-beam computed tomography images of 400 patients with a mean age of 36.49±15.91 years. Results: Anterior clinoid process length, width, and angle were measured as 10.56±2.42 mm, 5.46±1.31 mm, and 42.56±14.68 degrees, respectively. The tip of ACP was measured as 6.60±1.50 mm away from the posterior rim of OS. In the 631 sides (78.87%) did not have ACP pneumatization. In the cases with ACP pneumatization, three different configurations were identified as follows: Type 1 in 71 sides (8.87%), Type 2 in 56 sides (7%), and Type 3 in 42 sides (5.23%). Relative to ACP, the location of OS was determined as follows: Type A in 29 sides (3.64%), Type B in 105 sides (13.12%), Type C in 344 sides (43%), Type D in 289 sides (36.12%), and Type E in 33 sides (4.12%). The spread of data related to the attachment site of OS according to the presence or absence of ACP pneumatization showed that the location of OS was affected by ACP pneumatization (P<0.001). In ACPs with pneumatization, the frequency of OS position relative to ACP was found as follows: Type A in none of sides (0%), Type B in 8 sides (7.6%), Type C in 53 sides (15.4%), Type D in 88 sides (30.4%), and Type E in 20 sides (60.6%). Conclusions: The main finding of this study was that the location of OS relative to ACP was affected by ACP pneumatization. In ACPs with pneumatization, OS was located more posteriorly compared with ACPs without pneumatization.

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Section: Discussioncontrasting

confidence: 72%

Change in the Location of the Optic Strut Relative to the Anterior Clinoid Process Pneumatization

Adanır¹,

Ceylan

İnceoğlu³

et al. 2022

Journal of Craniofacial Surgery

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“…However, ACP-L was smaller in CM-I (11.12 AE 2.09 mm) than the control group (12.79 AE 2.43 mm; p < 0.001). Our average values for both groups were compatible with previous studies (►Table 7), 10,12,18,19,21,22,[39][40][41][42][44][45][46][47][48][49][50] in where the mean data range was presented between 5.30 and 12.50 mm. In contrast to ACP-L value, ACP-A, OS-L, and Dis-ACP-OS were found greater in CM-I than the control group.…”

Section: Sellar Region In Chiari Typesupporting

confidence: 92%

“…Dis-ACP-OS was measured as 6.04 AE 0.92 mm for CM-I and 5.60 AE 1.46 for the control group (p ¼ 0.020). Our values of these parameters for both groups were compatible with previous studies (►Table 7), 10,18,41,43,[48][49][50] in where the mean data range was given as 3.94 to 6 mm for OS-L and as 5.80 to 13.84 mm for Dis-ACP-OS. On the other hand, the wide range between average values given in the previous articles may be owing to differences in study populations (e.g., age, sex, region, and side) or methods (CT, cone-beam computed tomography, digital caliper, etc.).…”

Section: Sellar Region In Chiari Typesupporting

confidence: 91%

Assessment of the Anterior Clinoid Process and Optic Strut in Chiari Malformation Type I: A Computed Tomography Study

Özalp

Özgüral

Alpergin

et al. 2023

J Neurol Surg B Skull Base

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Objective 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%). Conclusions 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.

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“…13 Similar observations were reported in Nepal, Indian, Japan, and Korean skulls, respectively. [14][15][16][17] Cecen et al classified ACP into three types: type I ACPs short, wide, and wide-angled; type II ACPs long, narrow, and narrow-angled; and type III ACPs. 18 In our study the length of the right ACP was 11.31 AE 2.76 mm, the left ACP was 11.54 AE 2.86 mm, the width of the right ACP was 7.70 AE 1.66 mm, the left ACP was 7.64 AE 1.67 mm, which means that the length of ACP of skulls is longer and the width is less than the average calculated in other countries.…”

Section: Discussionmentioning

confidence: 99%

“… 13 Similar observations were reported in Nepal, Indian, Japan, and Korean skulls, respectively. 14 15 16 17 Cecen et al classified ACP into three types: type I ACPs short, wide, and wide-angled; type II ACPs long, narrow, and narrow-angled; and type III ACPs. 18 …”

Section: Discussionmentioning

confidence: 99%

Anatomical Justification of Extradural Resection of the Anterior Clinoid Process

Sufianov,

Iakimov,

Garifullina

et al. 2023

Asian J Neurosurg

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Objective The study aimed to provide neuroanatomical justification of the extradural resection of the anterior clinoid process (ACP). Material and Method Using a cross-sectional study design, 47 cranial computed tomography (CT) scans were examined. There were 31 (65.96%) females aged 28 to 79 years. The measured dimensions were ACP length and width, and optic strut (OS) width. Index (iacp) was measured as the ratio of ACP width to ACP length. The ACP volume and working operating field (WOF) volume were measured using Syngo.via Siemens program. The percentage expansion of WOF after removal of the ACP was estimated on 5 fixed human cadaver heads with the exoscope VITOM 3D. The possibilities of the combined approach were demonstrated in a clinical case. Results The mean ACP lengths were 11.31 ± 2.76 and 11.54 ± 2.86 mm, on the right and left, respectively. The mean ACP widths were 7.70 ± 1.66 and 7.64 ± 1.67 mm, on the right and left, respectively. Average iacp was 0.67 (minimum 0.45; maximum 0.90). The width of the OS varied in the range from 1.37 to 4.75 mm. The average volume of right ACP was 0.71 ± 0.16 cm3, right WOF was 3.26 ± 0.74 cm3, left ACP was 0.71 ± 0.15 cm3, left and WOF was 3.20 ± 0.76 cm3. Removal of the right ACP expanded the right WOF by 22.21 ± 3.88%, and left ACP by 22.78 ± 5.50%. There was an approximately 25% increase in the WOF from the cadaveric dissections. Taking into account the variability of the ACP and OS, we proposed our own surgical classification of complicated (iacp ≥ 0.67; medium OS 2.5 mm ≤ 4.0 mm; wide OS ≥ 4.0 mm; ACP with pneumatization) and uncomplicated ACP (iacp 0.45 ≤ 0.67 mm; iacp ≤ 0.45; narrow OS ≤ 2.5 mm; ACP without pneumatization). Using this classification, we developed an algorithm for ACP dissection and removal. This was piloted in a clinical case of microsurgical clipping of a left internal carotid artery-posterior communicating artery aneurysm via the left minipterional approach. Conclusion Extradural removal of ACP expands the WOF by approximately 25%, it helps neurosurgeons to improve proximal vascular control and avoid complications, and expands the range of indications for neurosurgical interventions in the skull base area.

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Anterior Clinoid Process and Optic Strut- A Morphometric Study

Cited by 6 publications

References 8 publications

Change in the Location of the Optic Strut Relative to the Anterior Clinoid Process Pneumatization

Change in the Location of the Optic Strut Relative to the Anterior Clinoid Process Pneumatization

Assessment of the Anterior Clinoid Process and Optic Strut in Chiari Malformation Type I: A Computed Tomography Study

Anatomical Justification of Extradural Resection of the Anterior Clinoid Process

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