Qualitative and Quantitative Radio-Anatomical Variation of the Posterior Clinoid Process (original) (raw)
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Morphometry of the posterior clinoid process and dorsum sellae
Ceska A Slovenska Neurologie A Neurochirurgie, 2018
Aims: The posterior clinoid process (PCP) is a paired anatomic structure located in the middle cranial fos sa on the superior surface of the sphenoid bone where it forms a bony eminence that is the lateral boundary of the dorsum sel lae (DS). The aim of the study was to analyse PCP and DS morphometry in CT. Materials and methods: The study was based on 100 CT investigations of 54 women and 46 men aged 18-88 years (mean age 52.49 years). The PCP and DS morphometry was studied in coronal and sagittal planes. Data were analysed statistical ly in relation to patients' gender and age (group 1: up to 45 years, group 2: over 45 years). Results: The average width of the right and left PCP was 10.2 mm and 9.85 m m, resp., while the average height of the right and left PCP was 2.32 mm and 2.04 m m, resp. The thickness of the DS superior edge was 3.29 m m, and of the right and left PCP 4.28 mm and 4.31 m m, resp. Statistical calculations led to the conclusion that the right PCP was wider and thicker in men. Moreover, the DS superior edge is also thicker in men, and the left PCP is wider and higher in people over 45 years of age. Conclusions: The PCP and DS are dif erent in men and women: 1. The right PCP is wider and thicker in men than in women; 2. The superior edge of the DS is thicker in men than in women; 3. The width and height of the left PCP reach higher values in patients over 45 years of age compared to those below 45 years of age. Souhrn Cíle: Proces sus clinoideus posterior (PCP) je párová anatomická struktura situovaná ve střední jámě lební na horní straně klínové kosti, kde tvoří kostní výběžek, který představuje laterální hranici dorsum sel lae (DS). Cílem studie bylo analyzovat morfometrii PCP a DS pomocí CT. Materiály a metody: Studie byla provedena na základě analýzy sta snímků pořízených CT u 54 žen a 46 mužů ve věku 18-88 let (průměrný věk 52,49 let). Na snímcích byla analyzována morfometrie PCP a DS v koronální a sagitální rovině. Získaná data byla statisticky analyzována ve vztahu k pohlaví a věku pa cientů (skupina 1: pa cienti do 45 let, skupina 2: pa cienti starší 45 let). Výsledky: Průměrná šířka byla 10,2 mm u pravého PCP a 9,85 mm u levého PCP. Průměrná výška pravého PCP byla 2,32 mm a průměrná výška levého PCP 2,04 m m. Tloušťka horního okraje DS byla 3,29 mm a tloušťka pravého a levého PCP byla 4,28 mm a 4,31 m m. Statistické výpočty ukázaly, že pravý PCP je u mužů širší a silnější. Stejně tak horní okraj DS byl silnější u mužů a levý PCP byl širší a vyšší u osob starších 45 let. Závěry: Mezi PCP a DS mužů a žen existují rozdíly: 1. Pravý PCP je širší a silnější u mužů než u žen; 2. Horní okraj DS je silnější u mužů než u žen; 3. Šířka a výška levého PCP dosahovala vyšších hodnot u pa cientů starších 45 let oproti skupině pa cientů ve věku do 45 let.
Morphological Variation of Anterior Clinoid Process in Dry Human Skulls
Birat Journal of Health Sciences, 2020
Introduction: The anatomical relationship of the Anterior Clinoid Process (ACP) with its neighboring structures in the base of the skull is complex with different variations. Thus, study of its morphology is essential in defining and directing surgery. Objective: This study aims to investigate the anatomy of the anterior clinoid process and prevalence of Caroticoclinoid foramen (CCF) to highlight its variations. Methodology: The measurements were performed in 31 dry human skulls to define the structure of ACP, the presence of CCF and other relevant landmarks using digital Vernier Calipers. Results: The mean length, basal width and thickness of the right ACP was 9.88+/- 1.36 mm, 8.72+/-1.50 mm, and 5.21+/-1.83 mm respectively and that of the left was 10.30+/-1.47, 8.73+/-1.71, and 5.33+/-1.60 mm respectively. Paired t-test was used to compare the mean of these sides. Type III was the most common form of ACP for both the sides. Out of 31 skulls, CCF was observed in 12 (38.7%) skulls ...
Morphometry of Anterior Clinoid Process: A Cadaveric Study
International Journal of Anatomy and Research, 2016
Surgeries in the paraclinoid region for the clinoid segment of internal carotid artery, periclinoid tumours, lesions of anterior part of cavernous sinus and traumatic optic neuropathy require the removal of anterior clinoid process to increase the accessibility to the important structures in the region. Anterior clinoidectomy is a critical and important procedure and requires utmost knowledge of the morphometry of anterior clinoid process. So, this study was undertaken to record the morphometry of anterior clinoid process (ACP). Materials and Methods: Fifty formalin-fixed cadavers were utilized from a medical college in Mumbai, Maharashtra. The measurements were done bilaterally after removal of the brain and meticulous dissection of cranial fossae was done to reflect the duramater, nerves, vessels and other structures from the field of measurement. Results: The mean distance between the tip of ACP and medial margin of the optic canal on the right side was 11.5 mm and on the left side was 11.6 mm; the mean distance between the tip of ACP and lateral margin of the optic canal on the right side was 5.4 mm and on the left side was 5.4 mm; the mean distance between medial margin of the optic canal and the lateral edge of ACP on the right side was 14.3 mm and on the left side was 14.2 mm; the mean distance between the lateral margin of the optic canal and the lateral edge of ACP on the right side was 3.3 mm and on the left side was 3.4 mm; the mean distance between the tip of ACP and the tip of posterior clinoid process (PCP) on the right side was 4.2 mm and on the left side was 4.3 mm; the mean distance between the tips of ACP was 22.8 mm; the mean distance between the ACPs at the level of lateral margin of the optic canal was 23.9 mm; the mean distance between the ACPs at the level of medial margin of the optic canal was 12.3 mm and mean vertical dimension of the ACP at the level of lateral margin of optic canal was 2.4 mm. Conclusion: The findings of the present study will help the surgeons in surgeries of the cavernous sinus and paraclinoid region requiring anterior clinoidectomy.
Morphology of the anterior clinoid process in a select Kenyan population
Anatomy journal of Africa, 2018
Knowledge of the morphological variations of the anterior clinoid process is pertinent during anterior clinoidectomy to prevent injury to the adjacent neurovascular structures as well as in the interpretation of skull base radiographs. Fifty-one open crania (102 anterior clinoid processes) were obtained from the Departments of Human Anatomy in three Kenyan Universities. Caroticoclinoid foramen was present in nine (17.6%) out of the 51 skulls studied. Of the 9 skulls, 2 had bilateral complete foramina while the remaining 7 had unilateral foramina, all on the left side. The mean length of the anterior clinoid process ranged between 5.0 and 18.8mm with a mean of 10.92±2.79 mm. The mean width was found to be 10.43±2.67 mm (range: 5.3-18.0mm) while the average thickness was 5.43±2.02mm (range: 1.3-11.9mm). There were no statistically significant side differences in the dimensions of the anterior clinoid process. Type IIIb anterior clinoid process was the commonest (47.1%) while type IIIa was the least common (7.8%). Compared to other populations, the anterior clinoid process in our setting shows some differences involving its type and the caroticoclinoid foramen. These features should be taken into account when interpreting skull base radiographs and planning for anterior clinoidectomies.
Journal of neurosurgery, 2017
OBJECTIVE The middle clinoid process (MCP) is a bony projection that extends from the sphenoid bone near the lateral margin of the sella turcica. The varied prevalence and morphological features of the MCP in populations stratified by age, race, and sex are unknown; however, the knowledge of its anatomy and preoperative recognition on CT scans can aid greatly in complication avoidance and management. The aim of this study was to further illustrate the surgical anatomy of the parasellar region and to quantify the incidence of MCP and caroticoclinoid rings (CCRs) in dried preserved human anatomical specimens. METHODS The presence, dimensions, morphological classification (incomplete, contact, and CCR), and intracranial relations of the MCP were measured in 2726 dried skull specimens at the Hamann-Todd Osteological Collection at the Cleveland Museum of Natural History. Specific morphometric data points were recorded from each of these hemiskulls, and categorized based on age, sex, and ...
International Journal of Approximate Reasoning, 2017
Address for Correspondence: Dr M Janardhan Rao, Associate Professor, Department of Anatomy, Kamineni Academy of Medical Sciences and Research Center, L B Nagar, Hyderabad, Telangana, India. Contact number: 09030504816 E-Mail: drmjr.kams@gmail.com Introduction: Anterior clinoidectomy is a surgical removal of the anterior clinoid process which is widely used to increase the clinoid space for the treatment of internal carotid artery or ophthalmic artery aneurysms, tumors of this region, and cavernous sinus pathology. Morphometric analysis of the anterior clinoid process would help the neurosurgeons while performing extradural or intradural anterior clinoidectomy. Materials and Methods: The present study was consisting of 100 anterior clinoid processes in 50 adult human skulls of South Indian origin. The skull caps were removed and the skulls with damage or pathology near the sella turcica and anterior clinoid process were excluded from the study. All the parameters were measured by usi...
International Journal of Research in Pharmaceutical Sciences, 2020
Detailed morphometric analysis is required for various surgical approaches in the craniovertebraljunction. High mortality and morbidity are anticipated for the surgical procedures when undertaken without in-depth anatomical knowledge. With so much clinical importance in this area, our study will present a thorough understanding in terms of skull and CT values.The main aim of this study is to give the morphometric details of occipital condyles and foramenmagnum in cadaveric skulls andCT scans.Seventy dried human skulls and 70 CT images on the three-dimensional volume-rendered reconstruction of the skull base was used for this study.The length and width of the occipital condyle of right and the left side was 22.21 ±5.20 mm; 22.05±4.83 mm; 12.57 ± 2.50 and 12.68 ± 2.92mm respectively in cadaver skull. The length and width of occipital condyles in CT scans for right and left side was 21.61± 3.09 mm; 21.58± 3.50 mm; 13.04± 1.58 mm and 13.13± 2.54 mm respectively. The Anteroposterior and ...
Extradural resection of the anterior clinoid process: How I do it
Neurochirurgie, 2017
Background.-The anterior clinoid process shares a close relationship with the optic canal, the internal carotid artery, the superior orbital fissure and the cavernous sinus. These structures may be involved in diseases whose surgical exposure requires prior clinoid process resection. Method.-Based on operative cases we describe the different steps of this surgical technique and illustrate our surgical procedure with a video. Dividing the orbito-temporal periosteal fold is a key-step in order to optimize the elevation of the periosteal dural layer at the level of the superior orbital fissure to expose the contours of the anterior clinoid process. The clinoid tip is removed after "debulking" the bony content inside the anterior clinoid process in order to leave only a thin shell of bony contour. The bony shell is then detached from the dura, twisted and pulled out. The indications and limitations of the technique are presented. Conclusion.-The extradural approach of the anterior clinoid process totally provides a full resection of the anterior clinoid process and safety for the paraclinoid space structures. Meticulous stepwise bony resection and optimized dura opening contribute to reduce the risk inherent to this technique.
International journal of health sciences
This study is to analyze the morphometry of anterior clinoid process (ACP) and the surrounding parasellar structures which is important for the surgeries related to cavernous sinus, ICA, and basilar artery. A cross-sectional study has been done on 77 adult human dry skulls among North Indian population. The length, width, thickness of ACP and distance between ACP to OS, distance between two ACPs, distance between PCPs, distance between ACP to PCP were measured using digital vernier caliper. The mean and standard deviation was calculated and paired t-test was applied for the comparison. The mean length and width and thickness of ACP was 8.72±0.94 mm, 8.13±1.16 mm and 1.10±0.44 mm on right and 8.57±0.91mm, 8.05±1.24 mm and 1.40±0.41mm on left side. The average distance between the ACP tip to OS and ACP and PCP tip was 6.01±1.11mm and 8.79±1.49mm on the right and 5.90±0.99mm and 8.47±1.49mm left side. The mean distance between the ACP tip and PCP tip was 20.10±2.36 mm and 12.63±2.03 mm...