Abstract
Introduction
In order to perform trans-sphenoidal endoscopic pituitary surgery safely and efficiently it is important to identify anatomical and pituitary disease features on the pre-operative CT and MRI scans; thereby minimising the risk to surrounding structures and optimising outcomes. We aim to create a checklist to streamline pre-operative planning.
Methods
We retrospectively reviewed pre-operative CT and MRI scans of 100 adults undergoing trans-sphenoidal endoscopic pituitary surgery.
Results
Radiological findings and their incidence included deviated nasal septum (62%), concha bullosa (32%), bony dehiscence of the carotid arteries (18%), sphenoid septation overlying the internal carotid artery (24% at the sella) and low lying CSF (32%). The mean distance of the sphenoid ostium to the skull base was 10 mm (range 2.7–17.6 mm). We also describe the ‘teddy bear’ sign which when present on an axial CT indicates the carotid arteries will be identifiable intra-operatively.
Conclusions
There are significant variations in the anatomical and pituitary disease features between patients. We describe a number of features on pre-operative scans and have devised a checklist including a new ‘teddy bear’ sign to aid the surgeon in the anatomical assessment of patients undergoing trans-sphenoidal pituitary surgery.
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References
Cappabianca P, de Divitiis E (2004) Endoscopy and transsphenoidal surgery. Neurosurgery 54(5):1048–1050
Famini P, Maya MM, Melmed S (2011) Pituitary magnetic resonance imaging for Sellar and Parasellar masses: ten-year experience in 2598 patients. J Clin Endocrinol Metab 96(6):1633–1641
Sethi DS, Stanley RE, Pillay PK (1995) Endoscopic anatomy of the sphenoid sinus and sella turcica. J Laryngol Otol 905:951–955
Mascarella MA, Forghani R, Sirhan D, Di Maio S, Mohr G, Zeitoni AG, Tewfik MA (2014) Analysis of potential determinants of a reduced intercarotid distance in patients undergoing endoscopic transsphenoidal surgery. Otolaryngol Head Neck Surg 151(1 Suppl):111
Kim YH, Kim JE, Kim MJ, Cho JH (2013) New landmark for the endoscopic endonasal transsphenoidal approach of pituitary surgery. J Korean Neurosurg Soc 53:218–222
Wei LF, Zhang J, Chen HJ, Wang R (2013) Value of anatomical landmarks in single-nostril endonasal transnasal-sphenoidal surgery. Exp Ther Med 5:1057–1062
Liu S, Wang Z, Zhou B, Yang B, Fan E, Li Y (2002) Related structures of the lateral sphenoid wall anatomy studies in CT and MRI. [in Chinese] Lin Chuang Er Bi Yan Hou Ke Za Zhu 16:407–409
Banna M, Olutola PS (1983) Patterns of pneumatization and septation of the sphenoidal sinus. J Can Assoc Radiol 34:291–293
Szolar D, Preidler K, Ranner G et al (1994) The sphenoid sinus during childhood: establishment of normal developmental standards by MRI. Surg Radiol Anat 16:193–198
Hamid O, El Fiky L, Hassan O, Kotb A, El Fiky S (2008) Anatomic variations of the sphenoid sinus and their impact on trans-sphenoid pituitary surgery. Skull Base 18(1):9–15
Hatipoglu HG, Cetin MA, Selvi A, Yuksel E (2009) Role of magnetic resonance imaging in evaluating sphenoid sinus and internal carotid artery. J Larynogol Otol 123:1331–1337
Viera JO Jr, Cukiert, Liberman B (2004) Magnetic resonance imaging of cavernous sinus invasion by pituitary adenoma diagnostic criteria and surgical findings. Arq Neuropsiquiatr 62(2B):437–443
Scotti G, Yu CY, Dillon WP, Norman D, Colombo N, Newton TH, De Groot J, Wilson CB (1988) MR Imaging of cavernous sinus involvement by pituitary adenomas. AJNR 151:799–806
Knosp E, Steiner E, Kitz K, Matula C (1993) Pituitary adenomas with invasion of the CS space: a magnetic resonance imaging classification compared with surgical findings. Neurosurgery 33:610–618
Cottier JP, Destrieux C, Brunereau L et al (2000) CSI by pituitary adenoma: MR imaging. Radiology 215:463–469
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Twigg, V., Carr, S.D., Balakumar, R. et al. Radiological features for the approach in trans-sphenoidal pituitary surgery. Pituitary 20, 395–402 (2017). https://doi.org/10.1007/s11102-017-0787-9
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DOI: https://doi.org/10.1007/s11102-017-0787-9