scholarly journals P11.02: Feasibility of automated transcerebellar axial plane finder using 3-dimensional volume of the fetal posterior fossa

2013 ◽  
Vol 42 (s1) ◽  
pp. 152-152
Author(s):  
I. Lee ◽  
J. Kwon ◽  
H. Cho ◽  
Y. Kim ◽  
Y. Park ◽  
...  
Keyword(s):  
Posterior Fossa ◽  
Axial Plane ◽  
3 Dimensional

Classification of the Superior Petrosal Veins and Sinus Based on Drainage Pattern

2014 ◽  
Vol 10 (2) ◽  
pp. 357-367 ◽  
Author(s):  
Ken Matsushima ◽  
Toshio Matsushima ◽  
Yoshihiro Kuga ◽  
Yuji Kodama ◽  
Kohei Inoue ◽  
...  
Keyword(s):  
Posterior Fossa ◽  
Lateral Surface ◽  
Preoperative Assessment ◽  
Anatomic Variations ◽  
Drainage Pattern ◽  
Middle Cerebellar Peduncle ◽  
3 Dimensional ◽  
Superior Petrosal Sinus ◽  
Cerebellar Peduncle

Abstract BACKGROUND: The increasing number of reports of complications after sacrificing the superior petrosal veins, the largest veins in the posterior fossa, has led to a need for an increased understanding of the anatomy of these veins and the superior petrosal sinus into which they empty. OBJECTIVE: To examine the anatomy of the superior petrosal veins and their size, draining area, and tributaries, as well as the anatomic variations of the superior petrosal sinus. METHOD: Injected cadaveric cerebellopontine angles and 3-dimensional multifusion angiography images were examined. RESULTS: The 4 groups of the superior petrosal veins based on their tributaries, course, and draining areas are the petrosal, posterior mesencephalic, anterior pontomesencephalic, and tentorial groups. The largest group was the petrosal group. Its largest tributary, the vein of the cerebellopontine fissure, was usually identifiable in the suprafloccular cistern located above the flocculus on the lateral surface of the middle cerebellar peduncle. The medial or lateral segment of the superior petrosal sinus was absent in 40% of cerebellopontine angles studied with venography. CONCLUSION: The superior petrosal veins and their largest tributaries, especially the vein of the cerebellopontine fissure, should be preserved if possible. Obliteration of superior petrosal sinuses in which either the lateral or medial portion is absent may result in loss of the drainage pathway of the superior petrosal veins. Preoperative assessment of the superior petrosal sinus should be considered before transpetrosal surgery in which the superior petrosal sinus may be obliterated.

Cavovarus With a Twist: Midfoot Coronal and Axial Plane Rotational Deformity in Charcot-Marie-Tooth Disease

2022 ◽  
pp. 107110072110646
Author(s):  
Tonya An ◽  
Edward Haupt ◽  
Max Michalski ◽  
Jari Salo ◽  
Glenn Pfeffer
Keyword(s):  
External Rotation ◽  
Deformity Correction ◽  
Axial Plane ◽  
Joint Disease ◽  
Coronal Plane ◽  
Soft Tissue Release ◽  
Rotational Deformity ◽  
Charcot Marie Tooth ◽  
3 Dimensional ◽  
Tarsal Bones

Background: The cavovarus deformity of Charcot-Marie-Tooth (CMT) disease is often characterized by a paradoxical relationship of hindfoot varus and forefoot valgus. The configuration of the midfoot, which links these deformities, is poorly understood. Accurate assessment of 3-dimensional alignment under physiologic loadbearing conditions is possible using weightbearing computed tomography (WBCT). This is the first study to examine the rotational deformity in the midfoot of CMT patients and, thus, provide key insights to successful correction of CMT cavovarus foot. Methods: A total of 27 WBCT scans from 21 CMT patients were compared to control WBCTs from 20 healthy unmatched adults. CMT patients with a history of bony surgery, severe degenerative joint disease, or open physes in the foot were excluded. Scans were analyzed using 3-dimensional software. Anatomic alignment of the tarsal bones was calculated relative to the anterior-posterior axis of the tibial plafond in the axial plane, and weightbearing surface in the coronal plane. Results: Maximal rotational deformity in CMT patients occurred at the transverse tarsal joints, averaging 61 degrees of external rotation (supination), compared to 34 degrees among controls ( P < .01). The talonavicular joint was also the site of peak adduction deformity in the midfoot, with an average talonavicular coverage angle measuring 12 degrees compared with −11 degrees in controls ( P < .01). Conclusion: This 3-dimensional WBCT analysis is the first to isolate and quantify the multiplanar rotational deformity in the midfoot of CMT patients. Compared with healthy unmatched control cases, CMT patients demonstrated increased axial plane adduction and coronal plane rotation at the talonavicular (TN) joint. These findings support performing soft tissue release at the TN joint to abduct and derotate the midfoot as a first step for targeted deformity correction. Level of Evidence: Level III, retrospective case-control study.

The Vermian-Crest Angle: A New Method to Assess Fetal Vermis Position within the Posterior Fossa Using 3-Dimensional Multiplanar Sonography

2018 ◽  
Vol 46 (4) ◽  
pp. 223-230
Author(s):  
Marialuigia Spinelli ◽  
Lavinia Di Meglio ◽  
Beatrice Mosimann ◽  
Edoardo Di Naro ◽  
Daniel Surbek ◽  
...  
Keyword(s):  
Posterior Fossa ◽  
New Method ◽  
3 Dimensional

scholarly journals Radical, Staged Approach to Extensive Posterior Fossa Pediatric Ependymoma: 3-Dimensional Operative Video

2017 ◽  
Vol 14 (6) ◽  
pp. 705-705
Author(s):  
Karol P Budohoski ◽  
Mathew R Guilfoyle ◽  
Damiano G Barone ◽  
Ramez W Kirollos ◽  
Rikin A Trivedi ◽  
...  
Keyword(s):  
Posterior Fossa ◽  
3 Dimensional ◽  
Pediatric Ependymoma ◽  
Staged Approach

scholarly journals Anterior cruciate ligament femoral-tunnel drilling through an anteromedial portal: 3-dimensional plane drilling angle affects tunnel length relative to notchplasty

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Dong-Kyu Moon ◽  
Ho-Seung Jo ◽  
Dong-Yeong Lee ◽  
Dong-Geun Kang ◽  
Hee-Chan Won ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Sagittal Plane ◽  
Femoral Tunnel ◽  
Cruciate Ligament ◽  
Standard Technique ◽  
Axial Plane ◽  
Coronal Plane ◽  
Tunnel Length ◽  
3 Dimensional ◽  
Anterior Cruciate

Abstract Background Notchplasty is a surgical technique often performed during anterior cruciate ligament reconstruction (ACLR) with widening of the intercondylar notch of the lateral distal femur to avoid graft impingement. The purpose of this study was to correlate femoral-tunnel length with 3-dimensional (3D) drilling angle through the anteromedial (AM) portal with and without notchplasty. Materials and methods Computer data were collected from an anatomical study using 16 cadaveric knees. The anterior cruciate ligament (ACL) femoral insertion was dissected and outlined for gross anatomical observation. The dissected cadaveric knees were scanned by computed tomography (CT). Three-dimensional measurements were calculated using software (Geomagic, Inc., Research Triangle Park, NC, USA) and included the center of the ACL footprint and the size of the ACL femoral footprint. The femoral-tunnel aperture centers were measured in the anatomical posterior-to-anterior and proximal-to-distal directions using Bernard’s quadrant method. The ACL tunnel was created 3-demensionally in the anatomical center of femoral foot print of ACL using software (SolidWorks®, Corp., Waltham, MA, USA). The 8-mm cylinder shaped ACL tunnel was rested upon the anatomical center of the ACL footprint and placed in three different positions: the coronal plane, the sagittal plane, and the axial plane. Finally, the effect of notchplasty on the femoral-tunnel length and center of the ACL footprint were measured. All the above-mentioned studies performed ACLR using the AM portal. Results The length of the femoral tunnels produced using the low coronal and high axial angles with 5-mm notchplasty became significantly shorter as the femoral starting position became more horizontal. The result was 30.38 ± 2.11 mm on average at 20° in the coronal plane/70° in the axial plane/45° in the sagittal plane and 31.26 ± 2.08 mm at 30° in the coronal plane/60° in the axial plane/45° in the sagittal plane, respectively, comparing the standard technique of 45° in the coronal/45° in the axial/45° in the sagittal plane of 32.98 ± 3.04 mm (P < 0.001). The tunnels made using the high coronal and low axial angles with notchplasty became longer than those made using the standard technique: 40.31 ± 3.36 mm at 60° in the coronal plane/30° in the axial plane/45° in the sagittal plane and 50.46 ± 3.13 mm at 75° in the coronal plane/15° in the axial plane/45° in the sagittal plane (P < 0.001). Conclusions Our results show that excessive notchplasty causes the femoral tunnel to be located in the non-anatomical center of the ACL footprint and reduces the femoral-tunnel length. Therefore, care should be taken to avoid excessive notchplasty when performing this operation.

Clipping of High-Risk Dural Arteriovenous Fistula of the Posterior Fossa: 3-Dimensional Operative Video

2019 ◽  
Vol 126 ◽  
pp. 413 ◽  
Author(s):  
Roberto Rodriguez Rubio ◽  
Ricky Chae ◽  
W. Caleb Rutledge ◽  
Alex De Vilalta ◽  
Ioannis Kournoutas ◽  
...  
Keyword(s):  
High Risk ◽  
Arteriovenous Fistula ◽  
Posterior Fossa ◽  
Dural Arteriovenous Fistula ◽  
3 Dimensional

Technical Nuances of Microvascular Decompression of the Posterior Fossa Cranial Nerves: 3-Dimensional Operative Video

2014 ◽  
Vol 10 (3) ◽  
pp. 487-487
Author(s):  
Ignacio Jusué-Torres ◽  
Pablo F. Recinos ◽  
Alfredo Quiñones-Hinojosa ◽  
Michael Lim
Keyword(s):  
Posterior Fossa ◽  
Microvascular Decompression ◽  
Cranial Nerves ◽  
3 Dimensional

Three-Dimensional Reconstruction Using Stereo Pairs from Serial Thick Sections

1977 ◽  
Vol 35 ◽  
pp. 562-563
Author(s):  
Robert Glaeser ◽  
Thomas Bauer ◽  
David Grano
Keyword(s):  
Three Dimensional ◽  
Dimensional Structure ◽  
Serial Sections ◽  
Thin Sections ◽  
3 Dimensional ◽  
Transmission Electron ◽  
Freeze Dried ◽  
Dimensional Reconstruction ◽  
Stereo Imagery ◽  
Whole Mounts

In transmission electron microscopy, the 3-dimensional structure of an object is usually obtained in one of two ways. For objects which can be included in one specimen, as for example with elements included in freeze- dried whole mounts and examined with a high voltage microscope, stereo pairs can be obtained which exhibit the 3-D structure of the element. For objects which can not be included in one specimen, the 3-D shape is obtained by reconstruction from serial sections. However, without stereo imagery, only detail which remains constant within the thickness of the section can be used in the reconstruction; consequently, the choice is between a low resolution reconstruction using a few thick sections and a better resolution reconstruction using many thin sections, generally a tedious chore. This paper describes an approach to 3-D reconstruction which uses stereo images of serial thick sections to reconstruct an object including detail which changes within the depth of an individual thick section.

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