Three-dimensional computed tomography in infantile atlantoaxial rotatory fixation

1994 ◽  
Vol 76-B (3) ◽  
pp. 367-370 ◽  
Author(s):  
R Scapinelli
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
Atlantoaxial Rotatory Fixation ◽  
Rotatory Fixation

Spontaneous craniocervical osseous fusion caused by cervical dystonia

2001 ◽  
Vol 95 (1) ◽  
pp. 115-118 ◽  
Author(s):  
Ralf Weigel ◽  
Michael Rittmann ◽  
Joachim K. Krauss
Keyword(s):  
Cervical Dystonia ◽  
Three Dimensional ◽  
Sternocleidomastoid Muscle ◽  
Facet Joints ◽  
Content Type ◽  
History Of ◽  
Posterior Neck ◽  
Atlantoaxial Rotatory Fixation ◽  
The Right ◽  
Rotatory Fixation

✓ The authors report on a 31-year-old man with spontaneous craniocervical osseous fusion secondary to cervical dystonia (CD). After an 8-year history of severe CD, the patient developed a fixed rotation of his head to the right. Three-dimensional computerized tomography reconstructions revealed rotation and fixation of the occiput and C-1 relative to C-2, which was similar to that seen in atlantoaxial rotatory fixation. There was abnormal ossification of the odontoid facet joints and ligaments. Additional ossification was observed in the cervical soft tissue bridging the lateral mass of C-1 and the occiput. The patient underwent partial myectomy of the dystonic left sternocleidomastoid muscle and selective posterior ramisectomy of the right posterior neck muscles; postoperatively he experienced relief of his neck pain. In patients with CD refractory to conservative treatment, the appropriate timing of surgical treatment is important.

Pathognomonic radiological signs for predicting prognosis in patients with chronic atlantoaxial rotatory fixation

2006 ◽  
Vol 5 (5) ◽  
pp. 385-391 ◽  
Author(s):  
Ken Ishii ◽  
Kazuhiro Chiba ◽  
Hirofumi Maruiwa ◽  
Masaya Nakamura ◽  
Morio Matsumoto ◽  
...  
Keyword(s):  
Facet Joint ◽  
Three Dimensional ◽  
Recurrent Dislocation ◽  
Fisher Exact Test ◽  
Exact Test ◽  
Chronic Group ◽  
Joint Deformity ◽  
Acute Group ◽  
Atlantoaxial Rotatory Fixation ◽  
Rotatory Fixation

Object The authors conducted a study to assess the correlation between radiological features and clinical courses in patients with chronic atlantoaxial rotatory fixation (AARF) and to determine diagnostic imaging signs for predicting prognosis. Methods There were 24 patients (eight boys and 16 girls) whose mean age was 7.8 years (range 4–14 years) and in whom AARF was diagnosed. The mean follow-up duration was 3.7 years (range 5 weeks–12 years). There were two groups of patients: 15 patients who visited the hospital less than 8 weeks after symptom (torticollis) onset comprised the acute group, and nine patients in whom the diagnosis of AARF was established later than 3 months after symptom onset comprised the chronic group. The chronic group was divided into two subgroups: those in whom the closed reduction could be achieved and those in whom it could not. Clinical data and radiographic studies, including plain radiographs and plain and three-dimensional (3D) computed tomography (CT) reconstructions, were reviewed retrospectively. A deformity of the superior C-2 facet joint was frequently observed in the group of patients with chronic AARF (p < 0.0001). This sign represented a risk factor for recurrent dislocation (p = 0.0003, Fisher exact test). Prominent lateral inclination of C-1 was an impeding factor for reduction of chronic AARF (p < 0.0001, analysis of variance with Fisher post hoc test). Greater than 20° of lateral inclination of the atlas indicated an irreducible subluxation (p = 0.0023, Fisher exact test). Conclusions Both facet joint deformity and lateral inclination observed on 3D CT reconstructions can be useful signs to predict the prognosis and the treatment of choice in patients with chronic AARFs.

scholarly journals Three-Dimensional Computed Tomography in Atlanto-Axial Rotatory Fixation.

1997 ◽  
Vol 46 (2) ◽  
pp. 453-455
Author(s):  
Masanori Matsumoto ◽  
Naoya Tajima ◽  
Shunichi Hirakawa ◽  
Shinichiro Kubo ◽  
Hiroshi Kuroki ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
Rotatory Fixation

scholarly journals Case Report of Atlantoaxial Rotatory Fixation after Cochlear Implantation

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Takahiro Nakashima ◽  
Keiji Matsuda ◽  
Takumi Okuda ◽  
Tetsuya Tono ◽  
Minoru Takaki ◽  
...  
Keyword(s):  
Cochlear Implantation ◽  
Conservative Therapy ◽  
Three Dimensional ◽  
Rare Condition ◽  
Ent Surgery ◽  
Grisel’S Syndrome ◽  
Two Factors ◽  
Atlantoaxial Rotatory Fixation ◽  
Nose And Throat ◽  
Rotatory Fixation

Atlantoaxial rotatory fixation (AARF) is a relatively rare condition and is mainly seen in children. We report of a 7-year-old girl suffering from AARF after cochlear implantation (CI). Fortunately, early diagnosis based on three-dimensional computed tomography (3DCT) was made, and the patient was cured with conservative therapy. Nontraumatic AARF, which is also known as Grisel’s syndrome and occurs subsequent to neck infections or ear, nose, and throat (ENT) surgery, represents only a small fraction of AARF cases. Two factors are mainly thought to contribute to the pathogenesis of the condition estimated, namely, (i) neck immaturity in children and (ii) infiltration by inflammatory mediators around the upper neck joint, easily permitted by the neck vasculature. AARF should be suspected in case of torticollis developing after ENT surgery.

X-ray microtomography

1988 ◽  
Vol 46 ◽  
pp. 998-999
Author(s):  
H.W. Deckman ◽  
B.F. Flannery ◽  
J.H. Dunsmuir ◽  
K.D' Amico
Keyword(s):  
Computed Tomography ◽  
Internal Structure ◽  
Imaging Technique ◽  
Three Dimensional ◽  
Tissue Structure ◽  
Individual Element ◽  
X Ray ◽  
Non Invasive ◽  
Panoramic Imaging ◽  
Three Dimensional Images

We have developed a new X-ray microscope which produces complete three dimensional images of samples. The microscope operates by performing X-ray tomography with unprecedented resolution. Tomography is a non-invasive imaging technique that creates maps of the internal structure of samples from measurement of the attenuation of penetrating radiation. As conventionally practiced in medical Computed Tomography (CT), radiologists produce maps of bone and tissue structure in several planar sections that reveal features with 1mm resolution and 1% contrast. Microtomography extends the capability of CT in several ways. First, the resolution which approaches one micron, is one thousand times higher than that of the medical CT. Second, our approach acquires and analyses the data in a panoramic imaging format that directly produces three-dimensional maps in a series of contiguous stacked planes. Typical maps available today consist of three hundred planar sections each containing 512x512 pixels. Finally, and perhaps of most import scientifically, microtomography using a synchrotron X-ray source, allows us to generate maps of individual element.

scholarly journals Accuracy and Reproducibility of Facial Measurements of Digital Photographs and Wrapped Cone Beam Computed Tomography (CBCT) Photographs

Diagnostics ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 757
Author(s):  
Maged Sultan Alhammadi ◽  
Abeer Abdulkareem Al-mashraqi ◽  
Rayid Hussain Alnami ◽  
Nawaf Mohammad Ashqar ◽  
Omar Hassan Alamir ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Cone Beam Computed Tomography ◽  
High Reliability ◽  
Three Dimensional ◽  
Cone Beam ◽  
Cross Sectional ◽  
Facial Profile ◽  
Digital Photographs ◽  
Gonial Angle

The study sought to assess whether the soft tissue facial profile measurements of direct Cone Beam Computed Tomography (CBCT) and wrapped CBCT images of non-standardized facial photographs are accurate compared to the standardized digital photographs. In this cross-sectional study, 60 patients with an age range of 18–30 years, who were indicated for CBCT, were enrolled. Two facial photographs were taken per patient: standardized and random (non-standardized). The non-standardized ones were wrapped with the CBCT images. The most used soft tissue facial profile landmarks/parameters (linear and angular) were measured on direct soft tissue three-dimensional (3D) images and on the photographs wrapped over the 3D-CBCT images, and then compared to the standardized photographs. The reliability analysis was performed using concordance correlation coefficients (CCC) and depicted graphically using Bland–Altman plots. Most of the linear and angular measurements showed high reliability (0.91 to 0.998). Nevertheless, four soft tissue measurements were unreliable; namely, posterior gonial angle (0.085 and 0.11 for wrapped and direct CBCT soft tissue, respectively), mandibular plane angle (0.006 and 0.0016 for wrapped and direct CBCT soft tissue, respectively), posterior facial height (0.63 and 0.62 for wrapped and direct CBCT soft tissue, respectively) and total soft tissue facial convexity (0.52 for both wrapped and direct CBCT soft tissue, respectively). The soft tissue facial profile measurements from either the direct 3D-CBCT images or the wrapped CBCT images of non-standardized frontal photographs were accurate, and can be used to analyze most of the soft tissue facial profile measurements.

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