Biomedical subjects

C Muren

Publications and source records attributed to C Muren.

30 records · Page 2Linked to original sources

PubMed1988

Imaging contribution to temporal bone anatomy.

The research programme at the Department of Otoradiology, Uppsala, has been directed towards radio-anatomic investigation of various structures of the temporal bone, such as the jugular fossa, the facial canal, the aqueducts, the internal acoustic meatus, and the extent of pneumatization. Deep-frozen temporal bone specimens have been examined by CT and multidirectional tomography in different projections. After that plastic casts have been prepared. The method allows assessment of the anatomic variations of the structures under study, and also an estimate of the reliability of radiographic reproduction. The resolution capability of CT allows satisfactory reproduction of both inner and middle ear structures. Of the ossicles the malleus and incus with their ligaments are regularly visualized. On rare occasions even the stapes can be reproduced.

Humans↗

PubMedDate not supplied

Computed tomography with intravenous cholangiography contrast: a method for visualizing choledochal cysts.

Our patient presented with a typical case history and typical symptoms. She also belongs to a group with a high incidence of the disorder. The diagnosis was suspected at ultrasonography, which accurately detected the presence and location of a cyst, but could not establish its origin. Computed tomography is a better diagnostic tool, as it will detect small differences in attenuation and thus identify contrast accumulation in the bile ducts, even when the function of the lever parenchyma is decreased. As scanning is performed in the transverse plane with the patient supine, the layering of contrast medium in the dilated duct is also displayed. In the analysis of our case, the accumulation of biliary contrast medium in the lesion at CT established its origin. The fusiform nature of the dilatation (the type I form of the disorder), was demonstrated at ERCP, after which the operation was performed.

Adult↗

PubMedDate not supplied

Patency of the cochlear aqueduct.

The patency of the cochlear aqueduct is discussed against the background of radioanatomic studies of 225 plastic casts of temporal bone specimens and additional experimental and clinical observations. The occasional presence of a wide venous channel running parallel with the cochlear aqueduct, as well as the existence of up to three accompanying venous channels can simulate a pathologically wide cochlear aqueduct radiographically. This could constitute a diagnostic pitfall in the absence of other clinical and radiographic signs of malformation.

Adolescent↗

PubMedDate not supplied

Anatomic variations of the human cochlear aqueduct. A radioanatomic investigation.

The cochlear aqueduct follows a course through the petrous pyramid that varies from straight and steeply vertical to a curvilinear and horizontal. Its course and length are correlated to the pneumatization of the pyramid and also to the volume of the jugular fossa. These two factors influence the radiographic reproduction of the cochlear aqueduct, especially in computed tomography in the axial transverse projection but to a far lesser degree in multidirectional tomography.

Cochlea↗

PubMedDate not supplied

Anatomic variations of the human semicircular canals. A radioanatomic investigation.

The anatomic variations of the semicircular canals were investigated in a series of 95 plastic temporal bone preparations. The results showed a wider range of variability than has been assumed previously. An intraindividual correlation was found between the sizes of the superior and lateral semicircular canals. Observations indicate why a semicircular canal is not invariably delineated on one tomographic plane despite correct positioning for its optimum reproduction.

Humans↗

PubMedDate not supplied

The semicircular canals of the inner ear and the pneumatization of the temporal bone. A radioanatomic investigation.

In an investigation of 94 plastic casts of temporal bone specimens a wide range of variations both in the general outline of the pyramid and in the anatomy of its specific structures was found. Attempts were made to estimate the transverse and vertical dimensions of the petrous bone. Both the mastoid and the perilabyrinthine pneumatization correlated to the dimensions of some structures, but not to the size and shape of the semicircular canals.

Humans↗

PubMedDate not supplied

The internal acoustic meatus. Anatomic variations and relations to other temporal bone structures.

The internal acoustic meatus was evaluated in 97 temporal bone specimens, half of which were radiographed in different projections. Part of the material was also examined by multidirectional and computed tomography. Casts of the specimens were prepared and the meatuses were measured in different planes. The anatomic variations, especially in the transverse plane, and their relations to other structures in the petrous bone, were assessed. The meatus varied in shape, being mainly either long and thin, short and broad, funnel-shaped or pear-shaped. The pear-shaped meatus was practically always broad. The angle formed by the long axis of the meatus and the posterior wall of the pyramid varied inversely with the meatal length, a long meatus forming a small angle and vice versa. Large anteroposterior diameters were correlated to large meatal angles, but there was no direct correlation between meatal length and width. In addition, the meatal length was correlated to the perilabyrinthine and mastoid pneumatization and also to the dimensions of the pyramid.

Humans↗

PubMedDate not supplied

Computed tomography of temporal bone specimens. A test of the resolution capability.

Ten deep-frozen temporal bone specimens were subjected to computed tomography (CT) in five different projections. The possibility of identifying small structures, such as the ossicles and aqueductal lumina, was assessed. In addition, the semicircular canals were measured. Subsequently corresponding measurements were carried out on plastic casts of these specimens for comparison. A temporal bone specimen is well suited as a test object for evaluating the detectability of small and dense natural structures by CT.

Ear Ossicles↗

PubMedDate not supplied

Anatomic variations of the chorda tympani canal.

The anatomic variations of the facial recess are of interest in certain otosurgical procedures. The medial border of the recess is the mastoid portion of the facial nerve canal, and the lateral border is the bony canal of the chorda tympani. These two structures were investigated in 64 polyester casts of temporal bone specimens. The point of exit of the chorda tympani canal from the facial canal was assessed together with the angle, formed between these two nerve channels. As a further way of describing the spaciousness at the facial recess, the distance between the sulcus of the stapedius muscle and the chorda tympani canal was evaluated.

Chorda Tympani Nerve↗

PubMedDate not supplied

Caroli's disease in two sisters. Diagnosis by ultrasonography and computed tomography.

Caroli's disease is a rare congenital disease with multiple segmental dilatations of the bile ducts. It may present in two forms: one (the simple form) with segmental dilatations only, and the other with dilatations combined with fibroangioadenomatosis, frequently complicated by portal hypertension. The disease is thought to be recessively inherited, but few familial cases have been reported. We have observed two sisters with the disease, one with the simple form, the other with fibroangioadenomatosis. Their case histories and diagnostic findings, with special reference to ultrasonography and computed tomography, are presented, and the potential for diagnosis by different imaging modalities is discussed.

Adult↗

PubMedDate not supplied

Cavitary pulmonary nodules in atypical collagen disease and lupoid drug reaction. Report of two cases.

The case histories of two patients with cavitary pulmonary nodules and the findings at chest radiography are reviewed. The first patient had a connective tissue disease with features common to systematic lupus erythematosus and Wegener's granulomatosis. In the second patient the lung changes developed as part of a drug reaction to carbamezapine and/or phenytoin. The common denominator of the cavitating nodules is probably the presence of granulomas, developing as a sequela of pulmonary vasculitis.

Adult↗

PubMedDate not supplied

Unilateral hydronephrosis with congenital absence of contralateral kidney in children. Report of six cases and review of literature.

The case histories of six children with absence of functioning renal parenchyma on one side and dilatation of the contralateral pelvis are reviewed. The hydronephrosis was obstructive in two cases. In the others no cause could be found. The development of this combination of renal malformations is discussed against an embryologic background.

Child↗