Measurement of widths on a coronal scan passing through the crista galli and the posterior half of both ocular globes. Measurement of widths on a coronal.

Slides:

Advertisements

Similar presentations

BONES OF NASAL CAVITY Masyitah Mustaffa.

Advertisements

Math 9 Unit 4 – Circle Geometry. Activity 3 – Chords Chord – a line segment that joints 2 points on a circle. A diameter of a circle is a chord through.

Cranial Bones, continued….. Sphenoid bone – Wedged between several other bones in anterior portion of cranium – Has a central portion and 2 wing-like structures.

Patient 4. Patient 4. Sinonasal carcinoma t(15;19). A, CT scan demonstrates a midline sinonasal tumor (arrow) with lytic bony destruction of the paranasal.

Facial Skeleton Maxillae (2) Form the upper jaw

Axial Skeleton Bones of the Skull.

Mural cholesteatoma. Mural cholesteatoma. Axial (A) and coronal (B) HRCT scans show the shell of the cholesteatoma in the epitympanum (black arrow) and.

A 50-year-old man with MD. Axial thin-section CT image shows decreased distance between the vertical limb of the posterior semicircular canal and the posterior.

Case 1. Case 1. CT scans in an 8-year-old boy with an ectopic tooth in the left nasal cavity.A, Coronal scan obtained with a bone window setting of 600-HU.

Subsidence of LT-CAGE devices at L5–S1.

Patient with cholesteatoma on the right and chronic otitis media without cholesteatoma on the left. Patient with cholesteatoma on the right and chronic.

Patient 5. Patient 5. Initial diagnosis: nonhealing midline granuloma (Stewart's syndrome); final diagnosis: non-Hodgkin's T-cell lymphoma. A, CT scan.

Coronal CT scans showing variation in concha size wth preservation of nasal air channels.A, Coronal CT scan of the paranasal sinuses shows moderate-sized.

MR images in different patients with SIFs

Demonstration of a bilaterally duplicated hypoglossal canal.

A, ROIs that were drawn in the flow territories of the anterior cerebral artery (cortex: ROIs 1 and 2, basal ganglia: ROIs 5 and 6) and the middle cerebral.

Normal progression of interbody fusion in a 28-year-old woman.

Image shows appearance of septum within dural sinus in a 68-year-old woman with normal results of an MR imaging examination. Image shows appearance of.

Two coronal views of the same case, demonstrating the aggressive appearing imaging features of mastoid segment FNSs. The left coronal T1-weighted postcontrast-enhanced.

Case 1, extranodal orbital involvement in Rosai-Dorfman disease.

Longitudinal sonogram of a predominantly anechoic TDC with internal debris and thick walls (solid white arrows) below the level of the hyoid bone (black.

A side-by-side comparison of EPVS in a cognitively healthy control versus a patient with aMCI A, A coronal MR brain image of a cognitively healthy control.

Coronal CT scan of the paranasal sinuses shows a moderate-sized left concha bullosa with moderate deviation of the nasal septum convexity to the right.

Contrast-enhanced fat-suppressed T1-weighted MR images obtained through the orbits show diffuse homogeneous thickening of the medial, lateral, and inferior.

Intramuscular course and entrapment of the C5 nerve root.

Case 3. Case 3. Images in a 59-year-old woman with an ectopic tooth on the left hard palate complicated by Aspergillus rhinitis.A, Plain-film radiograph.

Box-and-whisker plot of attenuation measurements with DE and SECT

Dislodged fusion device.

A, Coronal CT scan of the paranasal sinuses in a 45-year-old women with difficulty breathing shows the typical appearance of crista galli pneumatization.

A, Posterior planar scintigraphic image from a Tc99m-MDP bone scan demonstrates asymmetric sacral uptake without a horizontal strut in the setting of SIF.

AP (A) and lateral (B) radiographs demonstrating a discontinuous segment of the catheter, with broken catheter ends in the subcutaneous tissue of the lower.

Venous infarction in a patient with epidural and paraspinal abscesses.

A and B, Axial and coronal high-resolution CT images of the larynx in a 73-year-old patient with papillary thyroid cancer and left vocal cord paralysis.

Bony cochlear nerve canal atresia in a patient with CND

Patient 10. Patient 10. A, Coronal high-resolution CT scan, obtained through the sphenoid sinus, shows a defective intersphenoid septum deviated to the.

Two different cases of FNS, both coronal plane bone algorithm CT images show significant enlargement of the tympanic segment of the facial nerve with the.

CT scan demonstrates significant enlargement of the olfactory cleft in the adenocarcinoma (ADC) group compared with NSP and healthy sinus controls (HSC)

EACC with intramural bone fragments.

More examples of woodworkers’ adenocarcinomas.

Coronal T1-weighted postcontrast MR image in a 42-year-old woman with enhancing polyps in the left lateral wall of the nasopharynx and sphenoid sinus and.

Endoscopic perioperative management

Four more examples of missed additional aneurysms on DSA

Cystic changes within the endplates adjacent to the implants.

Schematic drawing with a coronal cut through the OB, demonstrating asymmetric neuronal layering in an adult OB. a, Nasal olfactory epithelium. b, Cribriform.

A, A 44-year-old woman with CP

Case 1: 52-year-old woman with buzzing in right ear.

Coronal postcontrast T1-weighted image of the orbits in patient 1 demonstrates a heterogeneously enhancing ovoid lesion involving the right medial rectus.

Orbital amyloidoma in a 32-year old woman with a slowly increasing mass in the right orbit and generalized bone pain. Orbital amyloidoma in a 32-year old.

A, Axial T2 MR imaging at the level of the hard palate shows an enlarged right lateral retropharyngeal lymph node (asterisk). A, Axial T2 MR imaging at.

CT images of a patient with inverted papilloma

Bone algorithm CT images from the same case, demonstrating focal enlargement of the right tympanic segment, in the axial (left) and coronal (right) planes.

Z-score brain surface map represents areas of metabolic reduction in patients in comparison with healthy subjects (data base group). Z-score brain surface.

Z-score brain surface map represents the result of group comparison between 2 healthy subjects groups such as control group (CG) and data base group (DBG).

Measurement of the ECL angle between the midline xy and the conchal lamina. Measurement of the ECL angle between the midline xy and the conchal lamina.

Scatterplots of the MDI and orbital apex angle (A), MDI and medial wall angle (B), and MDI and lateral wall angle (C) in patients with and without ON.

Lateral diagram of the fetal skull (A) (darker areas) and the adult skull (B) (lighter areas) shows that the inferior orbital rim and the superior orbital.

Two patients with bone defects on high-resolution CT and normal results of radionuclide cisternography and CT cisternography. Two patients with bone defects.

Automatic exposure control in the head of a pediatric patient.

Opacified anterior ethmoid air cell or suprabullar recess encroaches on the posterior aspect of the FSDP. Differentiation of an osseous air cell from an.

Schematic (A) and radiographic measurement (B) of pelvic incidence: an angle between a line drawn perpendicular to the middle of the superior sacral endplate.

Sagittal MDCT image of the craniocervical junction demonstrates the AOI, which is calculated by drawing a line perpendicular to the articular surfaces.

A, T2-weighted coronal image shows a soft-tissue mass of intermediate signal intensity in the left posterior nasal cavity.B, Postcontrast T1-weighted axial.

Coronal early phase postcontrast (A), axial early phase postcontrast (B), and axial delayed phase postcontrast (C) images showing an early enhancing 1.3-cm.

Coronal reformatted image from noncontrast sinus CT demonstrates the measurements of NSD. The midline is defined by a dashed line extending from the crista.

A 16-year-old boy with rhabdomyosarcoma.

Patient with a bone defect revealed by CT and positive results of radionuclide cisternography and CT cisternography. Patient with a bone defect revealed.

CT scans chosen for rWTH measures.

A 73-year-old woman with well-differentiated SCCA of the lacrimal sac and nasolacrimal duct. A 73-year-old woman with well-differentiated SCCA of the lacrimal.

Orbital infiltration. Orbital infiltration. A, Soft tissue is seen in the posterior left orbit in this patient with metastatic disease to the bone. The.

Presentation transcript:

Measurement of widths on a coronal scan passing through the crista galli and the posterior half of both ocular globes. Measurement of widths on a coronal scan passing through the crista galli and the posterior half of both ocular globes. The midline is defined by the xy line joining the bases of the crista galli and the vomer bone on the nasal floor. A perpendicular line zt is drawn tangent to the inferior limits of both ocular globes, cutting xy in O and the nasal septum line in C. The OC segment is equal to zero when the nasal septum is straight on the midline and is measured as positive when the C point is displaced opposite to the pathologic side and as negative in reverse conditions. The AE segment on the zt line measures the nasoethmoidal cavity total width and is decomposed into the following subsegments: AB for the width of the healthy ethmoidal labyrinth, BC for the width of the healthy olfactory cleft, CD for the width of the olfactory cleft on the pathologic side (in patients, the CD segment measures the median opacity without recognizable bony lamella, located between the nasal septum and the squeezed ethmoidal labyrinth on the pathologic side), and DE for the width of the ethmoidal labyrinth on the pathologic side (in patients, the DE segment measures the lateral opacity squeezed onto the orbital wall, in which ethmoidal bony lamellas are still recognizable). T. Georgel et al. AJNR Am J Neuroradiol 2009;30:1440-1444 ©2009 by American Society of Neuroradiology