Abstract
Objective: In this study our purpose is to evaluate the giant arachnoid granulations AG with 3T MR imaging. Patients and Methods: Amongst the cranial MR examinations evaluated from September 2008 to February 2009, the AGs larger than 5mms and obliterating the sinus lumen more than 50% were included in the study. MR imaging was performed in a 3 Tesla MR equipment. Sequence parameters were as follows T2 weighted turbo spin echo; slice thickness 5mm, TR 3300ms, TE 102ms, FoV 230, resolution 512, average 2, fl ip angle 120°, bandwidth 100 Hz/Px, voxel 0.6×0.4×5.0. Two radiologists performed the assessment. The largest dimension of AGs, location, morphology, the relationship between the calvarial and vascular structures were noted. Results: In 20 patients included in the study mean age 36.3 years 23 giant AGs were detected. At right transverse sinus 11, left 9; 1 at straight sinus, and 2 at torculer herofi li mean diameter 7.9mm was found. All AGs had a signal void focus at the center which was named as ‘dot sign’. The ‘dot sign’ and its vascular relations are demonstrated by MR venography as well. Conclusion: 3T MR imaging provides detailed and reliable information about AGs. In this study a central vascular structure named as ‘dot sign’ is found in all giants AGs larger than 5mms and defi ned as a helpful sign in the diff erential diagnosis.
References
- Mamourian AC, Towfi ghi J. MR of giant arachnoid granulation, a normal variant presenting as a mass within the dural venous sinus. AJNR Am J Neuroradiol. 1995 Apr;16(4 Suppl):901-4.
- Liang L, Korogi Y, Sugahara T, Ikushima I, Shigematsu Y, Takahashi M, et al. Normal structures in the intracranial dural sinuses: delineation with 3D contrast-enhanced magnetization prepared rapid acquisition gradient-echo imaging sequence. AJNR Am J Neuroradiol. 2002 Nov- Dec;23(10):1739-46.
- Gailloud P, Muster M, Khaw N, Martin JB, Murphy KJ, Fasel JH, et al. Anatomic relationship between arachnoid granulations in the transverse sinus and the termination of the vein of Labbe: an angiographic study. Neuroradiology. 2001 Feb;43(2):139-43.
- Leach JL, Jones BV, Tomsick TA, Stewart CA, Balko MG. Normal appearance of arachnoid granulations on contrast-enhanced CT and MR of the brain: diff erentiation from dural sinus disease. AJNR Am J Neuroradiol. 1996 Sep;17(8):1523-32.
- Kan P, Stevens EA, Couldwell WT. Incidental giant arachnoid granulation. AJNR Am J Neuroradiol. 2006 Aug;27(7):1491-2.
- Ikushima I, Korogi Y, Makita O, Yamura M, Kawano H, Kohama M, et al. MRI of arachnoid granulations within the dural sinuses using a FLAIR pulse sequence. Br J Radiol. 1999 Nov;72(863):1046-51.
- Liang L, Korogi Y, Sugahara T, Onomichi M, Shigematsu Y, Yang D, et al. Evaluation of the intracranial dural sinuses with a 3D contrast- enhanced MP-RAGE sequence: prospective comparison with 2D-TOF MR venography and digital subtraction angiography. AJNR Am J Neuroradiol. 2001 Mar;22(3):481-92.
- Farb RI. The dural venous sinuses: normal intraluminal architecture defi ned on contrast-enhanced MR venography. Neuroradiology. 2007 Sep;49(9):727-32.
- Roche J, Warner D. Arachnoid granulations in the transverse and sigmoid sinuses: CT, MR, and MR angiographic appearance of a normal anatomic variation. AJNR Am J Neuroradiol. 1996 Apr;17(4):677-83.
- Leach JL, Meyer K, Jones BV, Tomsick TA. Large arachnoid granulations involving the dorsal superior sagittal sinus: fi ndings on MR imaging and MR venography. AJNR Am J Neuroradiol. 2008 Aug;29(7):1335-9.
- Liauw L, van Buchem MA, Spilt A, de Bruine FT, van den Berg R, Hermans J, et al. MR angiography of the intracranial venous system. Radiology. 2000 Mar;214(3):678-82.
- Kirchhof K, Welzel T, Jansen O, Sartor K. More reliable noninvasive visualization of the cerebral veins and dural sinuses: comparison of three MR angiographic techniques. Radiology. 2002 Sep;224(3):804-10.
- VandeVyver V, Lemmerling M, De Foer B, Casselman J, Verstraete K. Arachnoid granulations of the posterior temporal bone wall: imaging appearance and diff erential diagnosis. AJNR Am J Neuroradiol. 2007 Apr;28(4):610-2.
Abstract
Amaç: Bu çalışmada amacımız dev araknoid granülasyonların 3T MR görüntüleme özelliklerinin değerlendirilmesidir. Hastalar ve Yöntemler: Eylül 2008-Şubat 2009 tarihleri arasında değerlendirilen MR incelemelerde izlenen araknoid granülasyonlardan 5mm ve daha büyük olanlar ile sinus çapında %50’den fazla yer kaplayan AGlar çalışmaya dahil edildi. MR incelemeler 3 Tesla MR cihazında gerçekleştirildi. T2 ağırlıklı turbo spin eko; kesit kalınlığı 5mm, TR 3300ms, TE 102ms, FoV 230, rezolusyon 512, averaj 2, Sapma açısı 120°, bant genişliği 100 Hz/Px, voksel boyutu: 0.6×0.4×5.0. İki radyolog tarafından yapılan değerlendirmede AG’ların en geniş boyutu, yerleşimi, morfolojisi, kalvarial ve vasküler yapılarla ilişkisi not edildi. Bulgular: Çalışmaya dahil edilen 20 hastada ortalama yaş 36.3 23 dev AG saptandı. Sağ transvers sinuste 11, solda 9; straight sinüste 1; torculer herofi lide 2 AG ortalama çap 7.9 mm saptandı. İzlenen tüm AG’ların santralinde sinyalsiz odak şeklinde vasküler yapı izlendi ve “nokta işareti” olarak tanımlandı.Nokta işareti ve AG ile vasküler yapı ilişkisi MR venografi ile demonstre edildi. Sonuç: Araknoid granülasyonların tanısında 3T MR görüntüleme güvenilir ve ayrıntılı bilgi sağlamaktadır. Bu çalışmada 5mm’den büyük tüm AG’larda santral vasküler yapı ile uyumlu nokta işareti tanımlanmış ve ayırıcı tanıda yardımcı bir işaret olarak değerlendirilmiştir
References
- Mamourian AC, Towfi ghi J. MR of giant arachnoid granulation, a normal variant presenting as a mass within the dural venous sinus. AJNR Am J Neuroradiol. 1995 Apr;16(4 Suppl):901-4.
- Liang L, Korogi Y, Sugahara T, Ikushima I, Shigematsu Y, Takahashi M, et al. Normal structures in the intracranial dural sinuses: delineation with 3D contrast-enhanced magnetization prepared rapid acquisition gradient-echo imaging sequence. AJNR Am J Neuroradiol. 2002 Nov- Dec;23(10):1739-46.
- Gailloud P, Muster M, Khaw N, Martin JB, Murphy KJ, Fasel JH, et al. Anatomic relationship between arachnoid granulations in the transverse sinus and the termination of the vein of Labbe: an angiographic study. Neuroradiology. 2001 Feb;43(2):139-43.
- Leach JL, Jones BV, Tomsick TA, Stewart CA, Balko MG. Normal appearance of arachnoid granulations on contrast-enhanced CT and MR of the brain: diff erentiation from dural sinus disease. AJNR Am J Neuroradiol. 1996 Sep;17(8):1523-32.
- Kan P, Stevens EA, Couldwell WT. Incidental giant arachnoid granulation. AJNR Am J Neuroradiol. 2006 Aug;27(7):1491-2.
- Ikushima I, Korogi Y, Makita O, Yamura M, Kawano H, Kohama M, et al. MRI of arachnoid granulations within the dural sinuses using a FLAIR pulse sequence. Br J Radiol. 1999 Nov;72(863):1046-51.
- Liang L, Korogi Y, Sugahara T, Onomichi M, Shigematsu Y, Yang D, et al. Evaluation of the intracranial dural sinuses with a 3D contrast- enhanced MP-RAGE sequence: prospective comparison with 2D-TOF MR venography and digital subtraction angiography. AJNR Am J Neuroradiol. 2001 Mar;22(3):481-92.
- Farb RI. The dural venous sinuses: normal intraluminal architecture defi ned on contrast-enhanced MR venography. Neuroradiology. 2007 Sep;49(9):727-32.
- Roche J, Warner D. Arachnoid granulations in the transverse and sigmoid sinuses: CT, MR, and MR angiographic appearance of a normal anatomic variation. AJNR Am J Neuroradiol. 1996 Apr;17(4):677-83.
- Leach JL, Meyer K, Jones BV, Tomsick TA. Large arachnoid granulations involving the dorsal superior sagittal sinus: fi ndings on MR imaging and MR venography. AJNR Am J Neuroradiol. 2008 Aug;29(7):1335-9.
- Liauw L, van Buchem MA, Spilt A, de Bruine FT, van den Berg R, Hermans J, et al. MR angiography of the intracranial venous system. Radiology. 2000 Mar;214(3):678-82.
- Kirchhof K, Welzel T, Jansen O, Sartor K. More reliable noninvasive visualization of the cerebral veins and dural sinuses: comparison of three MR angiographic techniques. Radiology. 2002 Sep;224(3):804-10.
- VandeVyver V, Lemmerling M, De Foer B, Casselman J, Verstraete K. Arachnoid granulations of the posterior temporal bone wall: imaging appearance and diff erential diagnosis. AJNR Am J Neuroradiol. 2007 Apr;28(4):610-2.
Details
| Primary Language | Turkish |
|---|---|
| Journal Section | Research Article |
| Authors | |
| Publication Date | March 1, 2010 |
| Published in Issue | Year 2010Issue: 1 |