1
|
Ay T, Akdag UB, Kilincli MF, Ogut E, Barut C. Anatomical variations of foramen of the diaphragma sellae and neighboring structures: a cadaveric study. Anat Sci Int 2024; 99:75-89. [PMID: 37500986 DOI: 10.1007/s12565-023-00736-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 07/13/2023] [Indexed: 07/29/2023]
Abstract
The aim of our study was to examine the variations and types of foramen of diaphragma sellae (FDS) and their relationship with nearby surgical landmarks on cadavers.Twenty adult (9 male, 11 female) formalin-fixed cadaveric heads were bilaterally used to analyze the anatomical relationships around the supradiaphragmatic region of sella turcica. Lengths and distances of nearby surgical landmarks were measured by a digital microcaliper. SPSS version 25 was used to analyze the comparison between genders and body sides. Dorsum sellae distances to tuberculum sellae and the optic chiasm(OC) were higher in males than females (p < 0.05). Type 8 infundibulum passage was the most common variation with 50%. There was no finding related to types 1-4 of infundibulum passage. Thus, the present study has indicated that the infundibulum passes mostly from the posterior half of the foramen. The shape of the foramen was irregular in 45%, circular in 20%, sagittally oval in 20%, and horizontally oval in 15% of the cases. The OC was noted normal in 60%, prefixed in 35%, and postfixed in 5% of the cases. Comprehensive anatomical knowledge about the types of the FDS and their neighboring structures is crucial for preoperative planning of sellar region diseases in terms of navigating the region when accessing the foramen. Discrimination of variations of FDS, OC, and pituitary stalk, their relationships, and differences between genders is useful to minimize potential surgical complications.
Collapse
Affiliation(s)
- Tufan Ay
- School of Medicine, Bahcesehir University, Istanbul, Turkey
| | | | | | - Eren Ogut
- Department of Anatomy, School of Medicine, Bahcesehir University, Istanbul, Turkey
| | - Cagatay Barut
- Department of Anatomy, School of Medicine, Istanbul Medeniyet University, 34715, Istanbul, Turkey.
| |
Collapse
|
2
|
Micko ASG, Keritam O, Marik W, Strickland BA, Briggs RG, Shahrestani S, Cardinal T, Knosp E, Zada G, Wolfsberger S. Dumbbell-shaped pituitary adenomas: prognostic factors for prediction of tumor nondescent of the supradiaphragmal component from a multicenter series. J Neurosurg 2022; 137:609-617. [PMID: 34952511 DOI: 10.3171/2021.9.jns211689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 09/28/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Dumbbell-shaped pituitary adenomas (DSPAs) are a subgroup of macroadenomas with suprasellar extension that are characterized by a smaller diameter at the level of the diaphragma sellae opening compared with the supradiaphragmal tumor component (SDTC). Hence, DSPAs may be particularly prone to a nondescending suprasellar tumor component and risk for residual tumor or postoperative bleeding. METHODS A multicenter retrospective cohort analysis of 99 patients with DSPA operated on via direct endoscopic endonasal transsphenoidal approach between 2011 and 2020 was conducted. Patient recruitment was performed at two tertiary care centers (Medical University of Vienna and University of Southern California) with expertise in endoscopic skull base surgery. DSPA was defined as having a smaller diameter at the level of the diaphragma sellae compared with the SDTC. RESULTS On preoperative MRI, all DSPAs were macroadenomas (maximum diameter range 17-71 mm, volume range 2-88 cm3). Tumor descent was found in 73 (74%) of 99 patients (group A), and nondescent in 26 (26%) of 99 patients (group B) intraoperatively. DSPAs in group A had a significantly smaller diameter (30 vs 42 mm, p < 0.001) and significantly smaller volume (10 vs 22 cm3, p < 0.001) than those in group B. The ratio of the minimum area at the level of the diaphragmal opening in comparison with the maximum area of the suprasellar tumor component ("neck-to-dome area") was significantly lower in group A than in group B (1.7 vs 2.7, p < 0.001). Receiver operating characteristic curve analysis revealed an area under the curve of 0.75 (95% CI 0.63-0.87). At a cutoff ratio of 1.9, the sensitivity and specificity for a nondescending suprasellar tumor component were 77% and 34%, respectively. CONCLUSIONS In the present study, the neck-to-dome area ratio was of prognostic value for prediction of intraoperative tumor nondescent in DSPAs operated on via a direct endonasal endoscopic approach. Pituitary adenoma SDTC nondescent carried the inherent risk of hemorrhagic transformation in all cases.
Collapse
Affiliation(s)
| | - Omar Keritam
- 1Department of Neurosurgery, Medical University of Vienna
| | - Wolfgang Marik
- 2Department of Biomedical Imaging and Image-guided Therapy, Division of Neuroradiology and Musculoskeletal Radiology, Medical University of Vienna, Austria; and
| | - Ben A Strickland
- 3Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Robert G Briggs
- 3Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Shane Shahrestani
- 3Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Tyler Cardinal
- 3Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | | | - Gabriel Zada
- 3Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
| | | |
Collapse
|
3
|
Castle-Kirszbaum M, Uren B, Goldschlager T. Anatomic Variation for the Endoscopic Endonasal Transsphenoidal Approach. World Neurosurg 2021; 156:111-119. [PMID: 34610448 DOI: 10.1016/j.wneu.2021.09.103] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 10/20/2022]
Abstract
Knowledge of anatomy and its variations is the key to safe and efficient surgery. The endoscopic endonasal route to the sella has evolved to become the preferred route to access a wide variety of diseases. We describe the skeletal, vascular, and neural anatomic variations that could be encountered from the nasal phase, through the sphenoid phase, to the sellar phase of the operative exposure. A preoperative checklist is also provided.
Collapse
Affiliation(s)
| | - Brent Uren
- Department of Ear, Nose and Throat Surgery, Monash Health, Melbourne, Australia
| | - Tony Goldschlager
- Department of Neurosurgery, Monash Health, Melbourne, Australia; Department of Surgery, Monash University, Melbourne, Australia
| |
Collapse
|
4
|
Zhang J, Yin T, Ding C, Gu J, Zhu B, Li J, Chen Z, Wang S. The "Double-Peak" Pattern of Pituitary Adenoma Intrasellar Pressure and Its Effects on the Microvascular Structure. World Neurosurg 2021; 151:e137-e145. [PMID: 33831613 DOI: 10.1016/j.wneu.2021.03.146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 03/29/2021] [Indexed: 11/17/2022]
Abstract
OBJECTIVE The purpose of the present study was to investigate the relationship between the intrasellar pressure (ISP) and the microvascular structure of pituitary adenomas. METHODS We retrospectively analyzed the ISP in 66 patients with pituitary adenomas. The corresponding microvascular structure was obtained using immunohistochemistry and analyzed for its correlation with the ISP. RESULTS The average ISP was 25.89 ± 8.27 mm Hg, and the ISP was not related to the size of the adenoma (Pearson correlation coefficient, 0.103; P = 0.415). The ISPs of adenomas with different Knosp grades were significantly different (P < 0.05). From grade 0 to grade 4, at first, the ISP increased with the Knosp grade and reached the first peak at grade 2. It then decreased at grade 3 and increased again at grade 4, showing a "double-peak" pattern. The minimal diameter and perimeter of the microvessels and the vessel-covered area percentage were positively related to the ISP. When these parameters were compared among the adenomas of different Knosp grades, they also exhibited a "double-peak" pattern. CONCLUSIONS In the present study, we found that with the increase in pituitary adenoma size and invasion of the surrounding tissues, the ISP of pituitary adenomas showed a "double-peak" pattern. The ISP and certain parameters of the microvascular structure are related, because the microvasculature adaptively changes its structure in response to the changing ISP to ensure a sufficient blood supply to the adenoma. The specific mechanism of this phenomenon requires further study.
Collapse
Affiliation(s)
- Jianhe Zhang
- Department of Neurosurgery, 900th Hospital, Fuzong Clinical College of Fujian Medical University, Fuzhou, People's Republic of China; Department of Neurosurgery, The Affiliated Hospital of Putian University, Putian, People's Republic of China
| | - Tengkun Yin
- Department of Neurosurgery, Liaocheng People's Hospital, Liaocheng, People's Republic of China
| | - Chenyu Ding
- The First Affiliated Hospital, Fujian Medical University, Fuzhou, People's Republic of China
| | - Jianjun Gu
- Department of Neurosurgery, Henan Provincial People's Hospital, Zhenzhou, People's Republic of China
| | - Bin Zhu
- Department of Neurosurgery, 900th Hospital, Fuzong Clinical College of Fujian Medical University, Fuzhou, People's Republic of China
| | - Jun Li
- Department of Neurosurgery, 900th Hospital, Fuzong Clinical College of Fujian Medical University, Fuzhou, People's Republic of China
| | - Ziqian Chen
- Medical Image Center, 900th Hospital, Fuzong Clinical College of Fujian Medical University, Fuzhou, People's Republic of China
| | - Shousen Wang
- Department of Neurosurgery, 900th Hospital, Fuzong Clinical College of Fujian Medical University, Fuzhou, People's Republic of China.
| |
Collapse
|
5
|
Ko HC, Lee SH, Shin HS, Koh JS. Predicting Arachnoid Membrane Descent in the Chiasmatic Cistern in the Treatment of Pituitary Macroadenoma. J Korean Neurosurg Soc 2020; 64:110-119. [PMID: 33105530 PMCID: PMC7819790 DOI: 10.3340/jkns.2020.0140] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 06/02/2020] [Indexed: 12/20/2022] Open
Abstract
Objective Preoperative prediction of the arachnoid membrane descent in pituitary surgery is useful for achieving gross total removal and avoiding cerebrospinal fluid leakage resulting from tearing of the arachnoid membrane in the chiasmatic cistern. In this study, we analyzed the patterns of arachnoid membrane descent during or after pituitary tumor surgery and identified the factors related to this descent.
Methods Analysis was restricted to pituitary macroadenomas not extending into the third ventricle or over the internal carotid artery. To minimize confounding factors, patients who underwent revision surgery, those who had a torn arachnoid during operation or small medial diaphragma sellae (DS) opening, and subtotal resections were excluded. We enrolled 41 consecutive patients in this retrospective analysis. The degree of arachnoid descent was categorized using intraoperative videos. Preoperative magnetic resonance findings, including tumor height, suprasellar extension, and variables including DS area and medial opening size, tumor composition, and displacement of the pituitary stalk and gland were evaluated to determine their correlations with arachnoid membrane descent.
Results Arachnoid membrane descent was significantly correlated with DS area and medial opening size. Based on T2-weighted images (T2WI) magnetic resonance (MR) images, tumor composition was significantly associated with arachnoid membrane descent. Other factors were not significantly correlated with arachnoid membrane descent.
Conclusion T2WI of tumor composition and preoperative MR imaging of DS area and medial opening provided valuable information regarding arachnoid membrane descent. These parameters may serve as fundamental measures to facilitate complete resection of pituitary macroadenomas.
Collapse
Affiliation(s)
- Hak Cheol Ko
- Stroke and Neurological Disorders Centre, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Seung Hwan Lee
- Stroke and Neurological Disorders Centre, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Hee Sup Shin
- Stroke and Neurological Disorders Centre, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Jun Seok Koh
- Stroke and Neurological Disorders Centre, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul, Korea
| |
Collapse
|