(PDF) Application of Orbital Sonography in Neurology

 

application of orbital sonography in neurology

Feb 04,  · In order to prevent cavitation effects, we strongly recommend a presetting of the ultrasound machine using a button “orbital ultrasound” with a predefined limitation of the MI. Application of Orbital Sonography in Neurology slightly lateral eye-lids with the examiner s ha nd resting on the orbital margin to minimize pressure on the globe (Fig. 1b/c). To optimize the display of anatomical stuctures, esp. the optic nerve, the transducer is positioned a littl e on the temporal side and the patient is asked. Apr 20,  · Ultrasound biomicroscopy is needed if FB in the angle is suspected Figure 2: B-scan ultrasound of the right eye shows an intraocular foreign body (IOFB) with shadowing behind the IOFB on the equator posterior (EP) and longitudinal (L) scans (a, b).


Neuro-ophthalmology Question of the Week: B-scan Ultrasound — Neuro-Ophthalmology


Measurement of papilledema using ultrasound: disc elevation is quantified by putting the first caliper on the uppermost part of the swollen disc; the second caliper is positioned on the strongly reflecting line representing the lamina cribrosa 8.

Neuro-Ophthalmology School of Medicine. Application of orbital sonography in neurology What are 7 indications for B-scan echography? Ultrasound can be a useful adjunct in localizing IOFB and to determine if the object is metallic. Ultrasound could be performed carefully in case of an open globe injury. Ultrasonography is useful in determining the extent of the intraocular damage, determining the presence of a retinal detachment, double perforation, as well as in detecting foreign bodies not seen on x-ray studies.

Ultrasonography can give an idea about the nature of the IOFB such as round or spherical foreign bodies, intraocular air, glass etc. Ultrasound biomicroscopy is needed if FB in the angle is suspected.

There is moderate vitreous debris overlying the IOFB but no distinct track in the vitreous white arrow. Although these can arise in the ciliary body or iris, they most commonly are seen in the choroid, application of orbital sonography in neurology. Like retinoblastoma, ultrasound has become invaluable in the diagnosis and follow-up evaluation of uveal malignant melanomas.

This homogenous highly cellular tumor results in low-to-medium internal reflectivity and regular internal structure.

Histologically, the collar button represents the portion of the tumor that has broken through the Bruch membrane, a basement membrane found between the choroid and the retina. Collar-button shaped choroidal melanoma. The lesion application of orbital sonography in neurology as a dome shape, then broke through the Bruch membrane to form the button on the anterior surface of the dome, application of orbital sonography in neurology.

Note the diagnostic A-scan pattern typical of melanoma, with the high retinal spike on the surface of the lesion but low-to-medium internal reflectivity within the lesion. The sclera and orbital tissues are seen as spikes to the right of the lesion. Examination of the extraocular muscles when thyroid eye disease is suspected 2 B-scan ultrasonogram reveals enlargement of the extraocular muscle belly.

The tendinous insertion of the extraocular muscle at the globe is not thickened, which is characteristic of thyroid-related orbitopathy. The conjunctival, episcleral, and scleral vessels are inflamed, leading to a bluish discoloration of the sclera. Scleritis is more common in women and is often unilateral. Work-up is routinely negative in the unilateral cases. B-scan ultrasonography shows diffuse thickening of the choroid, sclera, and episcleral tissues. Classically, the T-sign is present in cases of posterior scleritis.

Fluorescein angiography may SHOW punctate areas of leakage. The choroidal detachment is felt to be a result of the congested sclera. This congestion increases resistance to flow in the vortex veins and through the intact sclera, leading to choroidal effusions. The thickness of the sclera-choroid complex measured 2. The optic disc was swollen. There was fluid in the subtenon space producing a prominent T-sign Figure 5. There was neither scleral nodule nor retinal detachment.

The orbital veins were not dilated or tortuous. The T-sign was diagnostic of posterior scleritis. Biousse V application of orbital sonography in neurology Newman NJ. Theme Imaging in Thyroid Ophthalmopathy. Waldron RG. Medscape Rudd JC.

 

 

application of orbital sonography in neurology

 

Sonography. This book includes applications of sonography that can be used across a number of medical disciplines including radiology, thoracic medicine, urology, rheumatology, obstetrics and fetal medicine and neurology. The book revisits established applications in medical sonography such as biliary, testicular and breast sonography. Apr 20,  · Ultrasound biomicroscopy is needed if FB in the angle is suspected Figure 2: B-scan ultrasound of the right eye shows an intraocular foreign body (IOFB) with shadowing behind the IOFB on the equator posterior (EP) and longitudinal (L) scans (a, b). Application of Orbital Sonography in Neurology, Sonography, Kerry Thoirs, IntechOpen, DOI: / Available from: Michael Ertl, Maria-Andreea Cited by: 3.