Roland PS, Meyerhoff W, Mickey B (1991) Management of the external auditory canal in skull base surgery. Roche J, Warner D (1996) Arachnoid granulations in the transverse and sigmoid sinuses: CT, MR, and MR angiographic appearance of a normal anatomic variation. Ribas GC, Rhoton AL Jr, Cruz OR, Peace D (2005) Suboccipital burr holes and craniectomies. Raso JL, Gusmão SN (2011) A new landmark for finding the sigmoid sinus in suboccipital craniotomies. McDonald TJ, Facer GW, Clark JL (1986) Surgical treatment of the external auditory canal. McComick MW, Bartels HG, Rodriguez A, Johnson JE, Janjua RM (2016) Anatomical variations of the transverse-sigmoid sinus junction: implications for endovascular treatment of idiopathic intracranial hypertension. Lansley JA, Tucker W, Eriksen MR, Riordan-Eva P, Connor SEJ (2017) Sigmoid sinus diverticulum, dehiscence, and venous sinus stenosis: potential causes of pulsatile tinnitus in patients with idiopathic intracranial hypertension? AJNR Am J Neuroradiol 38:1783–1788 Kennel CE, Puricelli MD, Rivera AL (2019) Surgically-relevant anatomy of the external auditory canal bulge and scutum. Ichijo H, Hosokawa M, Shinkawa H (1996) The relationship between mastoid pneumatization and the position of the sigmoid sinus. Gangopadhyay K, McArthur PD, Larsson SG (1996) Unusual anterior course of the sigmoid sinus: report of a case and review of the literature. J Craniofac Surg 26:e619–e620ĭeguine C, Pulec JL (1997) Attic cholesteatoma with erosion of the superior bony canal wall. Çam OH, Karataş M (2015) A life threatening pitfall in ear surgery: extracranial sigmoid sinus. Curr Probl Diagn Radiol 44:511–516Ĭisneros JC, Lopes PT, Bento RF, Tsuji RK (2017) Sinus pericranii, petrosquamosal sinus and extracranial sigmoid sinus: anatomical variations to consider during a retroauricular approach. These structures may be adjacent, especially on the right side, and presurgical contrast MRI should be included when planning surgeries around the EAM.Ĭhawla A, Ezhil Bosco JI, Lim TC, Shenoy JN, Krishnan V (2015) Computed tomography features of external auditory canal cholesteatoma: a pictorial review. The positional relationship between the EAM and SS is highly variable and inconsistent. In three women, the distance was less than 5 mm on the right side. The shortest distance between the posterior wall of the EAM and the anterior margin of the SS was 12.3 ± 3.9 mm on the right side and 13.0 ± 2.9 mm on the left.
The intervening type was the most predominant, accounting for 85%. The positional relationships between the EAM and the anterior edge of the SS were classified into superior, intervening, and inferior types. The relationships and distances between the EAM and SS, in addition to the shape of cross sections of the EAM, were highly variable with left–right asymmetry. In all patients, the EAM and SS were well depicted on both the sagittal and axial images. Imaging data were transferred to a workstation for analysis. In total, 85 patients with an intact EAM, SS, and surrounding structures underwent thin-sliced, contrast MRI. The present study aimed to characterize the relationship using contrast magnetic resonance imaging (MRI). There is no study exploring the positional relationship between the external acoustic meatus (EAM) and the sigmoid sinus (SS) in detail.
0 kommentar(er)
