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  • 1
    ISSN: 1432-1084
    Keywords: Key words: Nasopharynx ; neoplasma ; Angiofibroma ; Angiofibroma ; postoperative ; CT ; MR imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The purpose of this study was to assess the radiological findings after surgical removal of juvenile nasopharyngeal angiofibromas (JNA). The postoperative CT and MRI scans of ten patients were reviewed. The cured group included six patients. The non-controlled group included six patients with eight recurrences. Two patients belonged to both groups as they were also followed and cured after surgery for relapse. Four recurrences were asymptomatic and diagnosed by imaging. The imaging patterns were matched to the patients clinical status and endoscopic findings. In the cured group, non-enhanced residual soft tissue masses were seen in all cases. In the non-controlled group, recurrence was always demonstrated on early postoperative CT or MR as a dramatically enhanced mass. The recurrence was located in the lateral or superior aspect of the nasopharynx (n = 3), deep to the fossa of Rosenmuller (n = 4) or out of the nasopharynx (n = 1). In two cases a remaining enhanced mass disappeared spontaneously on iterated examinations. Because of numerous asymptomatic relapses, a radiological workup is recommended four months after surgery, even in patients with normal endoscopy, to rule out posterolateral or extranasopharyngeal recurrences. Spontaneous evolution of residual masses must be appreciated on iterated imaging examinations.
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  • 2
    ISSN: 1432-1084
    Keywords: Key words: TIPS – Interventional procedures – Complications – Portal vein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Dissection of the portal vein is a rare entity which has been rarely described during transjugular intrahepatic portosystemic shunt (TIPS) procedure. We report three cases of dissection during this procedure and their complications. One dissection was immediately treated with coaxial stents. The two others were complicated either by a thrombus or by a false aneurysm. In the first case a second parallel stent was used to treat this complication. The patient with the portal vein false aneurysm was transplanted 4 days after this diagnosis. Portal vein dissection in TIPS procedure appeared to be less rare than has been reported and must be considered as a potential cause of TIPS dysfunction.
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  • 3
    ISSN: 1432-1084
    Keywords: Key words: Paranasal sinuses – Neoplasms – CT – MR imaging – Inverted papilloma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this study was to describe cross-sectional imaging features of recurrent papilloma of the nasal fossa and paranasal sinuses and to evaluate the role of MR and CT in the postoperative follow-up of this lesion. Magnetic resonance imaging and CT of ten patients who presented recurrence of inverted papilloma were reviewed and correlated to initial imaging, endoscopy, and surgical reports. Imaging patterns of recurrent inverted papilloma are identical to those of initial tumors and recurrence location is closely related to the site of the former lesion. Magnetic resonance is more efficient than CT for the diagnosis and evaluation of extensions. Magnetic resonance supplies the deficiencies of endoscopy in case of extensions to the frontal sinus or the lateral recess of the antrum, especially if mucosal hyperplasia or sinusitis is associated. Magnetic resonance imaging is the first imaging modality to perform in the follow-up after removal of inverted papilloma.
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  • 4
    ISSN: 1279-8517
    Keywords: Pseudocoarctation ; Left brachiocephalic vein ; Computed tomography ; Magnetic Resonance Imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs rapportent le cas d'un patient porteur d'une pseudocoarctation de l'aorte et d'une veine brachio-céphalique gauche rétro-aortique. L'association de ces deux anomalies congénitales, qui n'avait jamais été décrite auparavant, a été étudiée par aortographie, tomodensitométrie et imagerie par résonance magnétique.
    Notes: Summary The authors report a case of pseudocoarctation of the aorta associated with a retroaortic left brachiocephalic vein. This exceptional congenital malformation, never described before, was studied by aortography, computed tomography and magnetic resonance imaging.
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  • 5
    ISSN: 1279-8517
    Keywords: Larynx ; MRI ; Histology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The larynx is an organ with a complex anatomic structure. MRI allows the performance of sections in the three planes of space, so that this study of the soft parts of the larynx yields results superior to those of other imaging techniques. Together with laryngoscopy, MRI is most often used in assessing the extension of malignant laryngeal tumors. This assessment is fundamental in choosing the indications for surgery, but the published reports of MRI of the larynx are sometimes discordant. The visualization of certain important anatomic structures such as the conus elasticus is uncertain. Our aim was to study the MRI radio-anatomy of the larynx based on correlations between MRI and histologic sections. Eight anatomic specimens were studied four in the transverse plane, two in the sagittal plane, and two in the frontal plane. The MRI and histologic sections made at the same levels were compared. These comparisons allowed a description of the sectional radio-anatomy of the larynx and an assessment of the reliability and limitations of MRI. All the major anatomic structures could be identified. It was possible to demonstrate the conus elasticus. We were able to visualize the vocal process of the arytenoid cartilage, which has not to our knowledge been previously described in the literature.
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  • 6
    ISSN: 1279-8517
    Keywords: Uterus ; Anatomy ; Nuclear Magnetic Resonance Imaging ; Contraception ; Menstrual cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs décrivent l'anatomie zonale de l'utérus en Imagerie par Résonance Magnétique. L'aspect de l'utérus est différent en séquences pondérées en T1 et en T2; il est soumis à des variations de morphostructure et de signal en fonction de l'imprégnation hormonale. Vingt-sept IRM pelviennes ont été réalisées chez 16 femmes. Huit utilisaient des œstroprogestatifs comme moyen de contraception (groupe I) et ont eu une seule IRM. Six femmes étaient sans contraception (groupe II) et ont eu plusieurs IRM au cours du même cycle. Deux femmes étaient ménopausées (goupe III). Les résultats montrent des différences entre les dimensions utérines entre le groupe I et le groupe II, mais pas au sein du groupe II en fonction de la phase du cycle. La cavité endométriale est visible en séquences pondérées en T1 dans 40 % des cas ; en T2 elle est visible dans 100 % des cas ; elle est plus épaisse chez les femmes du groupe II pendant la seconde phase que chez celles des groupes I et III. Le signal du myomètre, comparé à celui de l'urine, augmente significativement entre les échos précoces et les échos tardifs des séquences pondérées en T2 chez les femmes du groupe I et chez celles du groupe II en seconde période du cycle, alors qu'il n'augmente pas ou diminue chez les femmes du groupe II en première période du cycle. La bande jonctionnelle n'est visible qu'en T2. Elle est plus épaisse dans le groupe II en seconde phase du cycle que dans le groupe II en première phase et que dans le groupe I. Elle n'est visible que chez une des deux femmes du groupe III. La connaissance de cette anatomie zonale et de ses variations de morphostructure et de signal en fonction de l'imprégnation hormonale est nécessaire en raison de l'important développement des indications de l'IRM en pathologie utérine et pelvienne.
    Notes: Summary Magnetic Resonance Imaging of the pelvis has lead to a new radioanatomical description of the uterus. Variations in the anatomical zones of the uterus were noted with different sequences used in MRI. There was also structural and signal variation depending on hormonal impregnation. Twenty seven MRIs of pelvices were carried out on 16 female volunteers. Eight of them were on œstroprogesterone as the method of contraception (Group I) and had a single MRI. Six were not taking contraceptives (Group II) and had different MRI's during the same cycle. Two women already had already gone through the menopause (Group III). Results showed differences in the size of the uterus (uterine height, length of the uterine body and cervix, diameter of the cervix) between groups I and II but no cyclic changes were observed within group II. The myometrium was found to be thicker in group I and in the luteal phase of group II females in comparison to the follicular phase in the same group. The endometrial cavity was seen in 40 % of cases on T1 weighted sequences; on T2 weighted sequences it was seen in all the cases. It was thicker during the second phase in group II than in group I and III. The myometrial signal compared to that of the bladder content (urine) showed a significant increase between early and late echoes on T2 weighted sequences in group I and during the second phase of the menstrual cycle in group II. No variations, or at times a decrease in signal, were observed during the first phase of the cycle in group II. The junctional zone was seen only on T2 weighted sequences. It was thicker in group II during the first phase of the cycle than in group II during the second phase and in group I. It was seen in only one of the two females of group III. The knowledge of this zonal anatomy and its structural and signal variations according to the hormonal state forms a necessary base for important developments in the imaging of uterine and pelvic pathology.
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  • 7
    ISSN: 1432-2161
    Keywords: Key words Osteosclerotic lesion ; Calcification ; Hydroxyapatite ; Humerus ; Disappearance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  We report on the spontaneous disappearance of a dense round lesion from within the greater tuberosity of the humerus. The patient was treated with oral non-steroidal anti-inflammatory agents for symptoms of subacromial bursitis. Symptoms resolved in 10 days and the lesion had vanished when radiographed 3 months later. We surmise the lesion to represent intraosseous crystal deposition.
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  • 8
    ISSN: 1432-1920
    Keywords: Computed Tomography ; Paranasal sinuses ; Anatomical variations ; Optic nerve ; Surgery (ethmoid sphenoid)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Damage to the optic nerve is a serious complication of intranasal sinus surgery. Protrusion of the optic canal into the sphenoid sinus is a major risk factor. In this prospective study of 150 CT studies, we found this anatomical variation in 8% of cases. It was consistently associated with pneumatisation of the ipsilateral anterior clinoid process. Protrusion of the optic nerve into the posterior ethmoid cells was never observed. CT is a useful part of the preoperative investigation of patients undergoing intranasal sinus surgery. Axial and coronal images obtained or by direct acquisition by reconstructions are necessary to show the position of the optic nerve.
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  • 9
    ISSN: 1432-1920
    Keywords: Key words Lens ; ocular ; Sinuses ; paranasal ; Computed tomography ; Radiation ; diagnostic procedures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The radiation dose to the lens during CT of the paranasal sinuses was measured in 20 patients. In 10 patients, a “standard” technique with axial and coronal sections was used. In the remaining 10 patients, overlapping axial sections for bidimensional reconstruction were obtained. Radiation dose was measured using thermoluminescent dosimeters. The mean dose was 22 mGy in patients who underwent “standard” CT and 42 mGy in those who underwent CT with overlapping sections. Dose was dependent on the total number of slices and of transorbital axial sections. Coronal sections did not statistically increase the radiation dose to the lenses. Although these doses were significantly below the critical dose for cataracts, CT with overlapping sections gives a considerably higher radiation dose. We recommend the bidimensional reconstruction technique only for selected cases (e. g. preoperative assessment of the roof of the ethmoid sinuses or in patients who can or should not maintain the hyperextended position required for coronal views).
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  • 10
    ISSN: 1432-1920
    Keywords: Meninges ; Neoplasia ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe an unusually extensive intracranial, skull base and cervical meningioma, whose clinical manifestations were minor; imaging revealed the true state of affairs and suggested the correct diagnosis.
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