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Biomedical subjects

C Virapongse

Publications and source records attributed to C Virapongse.

At least 55 records · Page 3Linked to original sources
PubMed1982

Evolution of dolichoectasia of the vertebrobasilar system as evidenced by serial computed tomography.

A case of dolichoectasia of the vertebrobasilar system and carotid arteries is presented. Features considered unique to this case include recurrence of trigeminal neuralgia after a standard surgical procedure, presumably caused by rapidly progressing dolichoectasia of the vertebrobasilar arteries, and progressive calcification and ventriculomegaly over the course of one and a half years, shown on sequential computed tomographic (CT) scans. Dolichoectasia is discussed briefly as a clinical entity and its characteristic CT scan findings are reviewed.

Aged↗
PubMed1982

The role of high resolution computed tomography in evaluating disease of the middle ear.

Successful temporal bone imaging demands appropriate modifications of the computed tomography (CT) scanner. While CT has been shown to be useful for demonstrating the detailed anatomy of the temporal bone, its role in the evaluation of middle ear pathology has not been investigated. Selective cases are presented to highlight the advantages of CT. Computed tomography is excellent in demonstrating soft tissue masses in the middle ear in inflammatory disease. It is also useful in accurately localizing bony fragments in trauma, as well as determining the status of the ossicles. Disease solely involving the tympanic membrane can be diagnosed on CT without subjecting the patient to surgical exploration.

Adult↗
PubMed1982

Computed tomographic anatomy of the temporal bone.

With the recent development of high-resolution computed tomography (CT), there is a growing need to explore the full potential of this new method in demonstrating the detailed anatomy of the temporal bone. For this purpose, dry skulls with intact ossicles were scanned in axial and coronal projections. The detailed CT anatomy of the temporal bone was documented, complemented by images from live patients. Because of its superior contrast resolution, CT was able to demonstrate numerous structures, such as the tympanic membrane, ossicles, and supporting structures, hitherto never or poorly visualized by any other method. In addition, the ease by which axial sections of the temporal bone could be obtained is of great benefit in displaying several structures previously difficult to evaluate.

Adult↗
PubMedDate not supplied

High-resolution computed tomography of the temporal bone: its role in the evaluation of middle ear disease.

High-resolution computed tomography (CT) was performed on the temporal bones of 93 patients in conjunction with pluridirectional tomography. The majority of the patients were scanned on the prototype Pfizer 0200 FS second-generation scanner, modified to meet the demands of high-resolution scanning. Images from this relatively economical scanner are almost comparable to those obtainable with the GE CT/T 8800 scanner in spatial and contrast resolution. CT scans of the temporal bone were found to be more sensitive than pluridirectional tomography in visualizing fractures and soft tissue masses in the middle ear, including fluid levels and tympanic membrane swelling. It is concluded that high-resolution CT of the temporal bone will probably soon entirely replace pluridirectional tomography.

Cholesteatoma↗
PubMedDate not supplied

Computed tomography in the study of the development of the skull base: 1. Normal morphology.

We examined 11 human fetuses (18 to 30 weeks' gestation) with high resolution CT to study the developmental ossification of the two main component structures of the skull base, the temporal and sphenoid bones. Computed tomography, with its excellent contrast discrimination, allowed clear visualization of the morphology of ossifying centers. Skull base growth during this gestational period was found to be a dynamic event with rapid changes in morphology and interosseous relationships. The growth of the sphenoid body on CT corroborates the studies done by Kodama, who used dehydrated skulls. The temporal bone proceeded in a stepwise fashion; complete encapsulation of the membranous labyrinth occurred before it grew anteroposteriorly to form the apex and mastoid.

Gestational Age↗
PubMedDate not supplied

Computed tomography of cerebrovascular calcifications in postsurgical hypoparathyroidism.

Despite the extensive literature on the radiographic appearance of basal ganglia calcification in hypoparathyroidism, the vascular and perivascular deposits that are the hallmark of this disease have not been described radiographically. We report two patients with postsurgical hypoparathyroidism in whom such vascular calcification was observed on CT and was confirmed pathologically in one. The metabolic disturbance leading to the vascular deposits is discussed.

Aged↗
PubMedDate not supplied

Computed tomography of combined right upper and middle lobe collapse.

We report two patients with combined right upper and middle lobe collapse and present the CT findings. The CT appearance is different from isolated right upper or middle lobe collapse, but similar to left upper lobe collapse. As with other types of lobar collapse, the diagnosis can usually be made from frontal and lateral chest radiography. However, occasionally the exact type of lung collapse may be unclear prior to CT, and thus CT may be useful in making the correct diagnosis.

Aged↗
PubMedDate not supplied

The spine in 3D. Computed tomographic reformation from 2D axial sections.

A new program (3D83, General Electric) was used to reformat three-dimensional (3D) images from two-dimensional (2D) computed tomographic axial scans in 18 patients who had routine scans of the spine. The 3D spine images were extremely true to life and could be rotated around all three principle axes (constituting a movie), so that an illusion of head-motion parallax was created. The benefit of 3D reformation with this program is primarily for preoperative planning. It appears that 3D can also effectively determine the patency of foraminal stenosis by reformatting in hemisections. Currently this program is subject to several drawbacks that require user interaction and long reconstruction time. With further improvement, 3D reformation will find increasing clinical applicability.

Adolescent↗
PubMedDate not supplied

Brain calcification in Kallman's syndrome. Computed tomographic appearance.

We report a 21-year-old white male with Kallman's syndrome (gonadotropic hypogonadism, hyposmia and sensorineural hearing loss) with extensive brain calcification, demonstrated for the first time by computed tomography. The pattern and anatomic distribution of the extensive brain calcification is nonspecific, being indistinguishable from those seen in other causes of brain calcification (principally diseases related to a disturbance in calcium metabolism), despite the normal serum calcium levels found in this patient. This syndrome, therefore, should be considered along with Cockayne's, Kearns-Sayre and Down's syndromes, tuberous sclerosis, carbonic anhydrase II deficiency, congenital mental deficiency and idiopathic familial basal ganglia calcification as another developmental cause of brain calcification, which usually show no disturbance in serum calcium level.

Adult↗