This Pin was discovered by Christy Reed. Discover (and save!) your own Pins on Pinterest. 12 paires de nerfs crâniens Flashcards Preview. UE 5 – Anatomie > 12 paires de nerfs crâniens > Flashcards. Study These Flashcards. L’étude anatomique de la vascularisation de la IIIe paire démontre l’existence de la IIIe paire, associée ou non à l’atteinte d’autres nerfs crâniens, suggère un.
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Alembic shape of exocranial a and bird-like shape of endocranial opening b. This enlargement of the jugular foramen is secondary to a marked dilatation of the lateral sinus and jugular vein draining these malformations just as lesser variations in size of the normal jugular foramen are determined by differences in size of the lateral sinus.
In 4 cases, the jugular foramen is demonstrated with special views. In 1 of our cases in which a glomus tumor was highly suspected by the referring otolaryngologist, sclerosis of the mastoid was present.
The radiographic projections for the demonstration of the jugular foramen are reviewed. Note preservation of jugular spine and normal size of pars nervosa in two tomograms at different levels.
All 4 of these additional neuromas presented radiographic enlargement of the jugular foramen. Angle tumor by pneumoenceph alography Small X Bernasconi et al. Frugoni, University of Padua, Italy. Other lesions derived from structures contiguous to the jugular foramen have been reported pairess involve the foramen. Of these observations, sclerosis of the mastoids unassociated with dess erosion is of doubtful significance in view of its high incidence in the general population.
The anatomical features of the jugular foramen are discussed with particular regard to its canal-like form and the normal variations in size, shape and symmetry of its endo- and exocranial openings.
Enlargement without evidence of erosion of the contours is of certain pathological significance only when it involves predominantly the pars nervosa. Neurology, The pattern of enlargement and erosion of the foramen serves to distinguish those lesions related to structures within the jugular foramen—tumors of the glomus jugulare, neuromas of nerves IX, X and XI, dilatations of the jugular vein secondary to vascular malformation Fig.
Irregular, ill-defined erosion of jugular foramen in 2 tumors of right glomus jugulare. A large number of special projections have been suggested, especially in the French and Italian literature, for the detailed study of the jugular foramen. The significant clinical and roentgenographic findings in the 19 cases reported in the world literature are summarized in Table 6. Complete bridging of jugular foramen. Radiographic correlation of asymmetrical lateral sinuses in late venous phase of carotid angiography A and jugular foramina in submentovertex view B.
Routine, Special views for J. crqniennes
Angle tumor by pneumoencephalography XI. A diagnosis of neuroma in the left jugular foramen was made by one of crankennes GDCbut at operation an acoustic neuroma in the usual location was found.
Dilatation of the internal jugular vein secondary to vascular malformation is reported for the first time as a cause of enlargement of the pars vascularis of the jugular foramen.
Bone defect in J. IX Revilla 58 [Case 1] 54 F?
We found normal internal acoustic meatuses and asymmetrical jugular foramina, the left being considerably larger than the right Fig. VII, X 2 gm. Tumors of the glomus jugulare produce a characteristic irregular erosion of the margins of the foramen with decalcification of the surrounding bone Fig.
These neuromas, which may be found associated with general neurofibromatosis, 22, 53 occasionally originate extradurally, 13, 14, 26 and sometimes extend extracranialy. The jugular foramen previously has been observed to show marked developmental variations in form and size.
Though not reported previously, pathologic enlargement of the jugular foramen may occur in vascular malformations. Opacification of left mastoid and normal jugular foramina in patient with clinical but no surgical evidence of tumor of the glomus jugulare.
On the basis of our anatomic studies and giving necessary consideration to the roentgenographic magnification, generalized enlargement of the jugular foramen without erosion of the contours is probably of pathologic significance only if the sum of its length, width of the pars vascularis, and width of the pars nervosa is 20 mm.
Cerebral angiography may aid further in this differential diagnosis. Revilla 58 [Case 2]. Internal acoustic meatus eroded. These two techniques were reported Davis, D. Structures neighboring jugular foramen. Tumor demonstrated by retrograde venography and sinusography. Tumor demonstrated by ventriculography. Chamberlain in the early thirties. Interpretation of the roentgenograms requires an awareness of the normal variations in the size, shape and symmetry of the jugular foramina.
Discussion The clinical findings of several different lesions in the region of the jugular foramen may be indistinguishable.
This enlargement is particularly noticeable in the medial portion of the foramen and widening of the petro-occipital fissure may be seen even on the conventional submentovertex view Fig. Both internal acoustic meatuses enlarged. Angle tumor by pneumoencephalography. Angle tumor by pneumoenceph alography. Pathology of the jugular foramen is indicated radiographically by enlargement and erosion of its margins.
Enlargement of the jugular foramen, on the other hand, is a very important finding and is observed in a high percentage of cases of tumors of the glomus jugulare when special projections are used Table 5.
R ecently we studied radiographically a patient presenting a syndrome of the cerebellopontine angle with a striking change in the pitch of the voice. Miscellaneous Pathology Other lesions derived from structures contiguous to the dee foramen have been reported to involve the foramen.
Using this projection, however, perfectly comparable views of both foramina are difficult to obtain. Jugular foramen syndrome and allied syndromes.
In our experience, symmetrical bilateral projections combined with tomography represent a useful compromise. Routine, Tomography, Special view for J. Cerebellum and brain stem in situ and tympanic area stippled on left.