Radiological follow-up of inverted papilloma.

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.

[Geometric modeling and virtual endoscopy of the laryngo-tracheal lumen from computerized tomography images: initial applications to laryngo-tracheal pathology in the child]. / Modélisation géométrique et endoscopie virtuelle de la lumière laryngo-trachéale à partir de données tomodensitométriques: premières applications aux pathologies laryngo-trachéales chez l'enfant.

Endoscopy is an essential stage in the management of laryngo-tracheal disorders in the infant, but remains a difficult procedure. CT scanning is used to confirm the abnormality and to estimate the degree to which the airway is compromised. The authors describe virtual endoscopy of the larynx and trachea based on a mathematical model, itself constructed from CT images. This work is based on a methodology developed at the Hôpital de la Timone for modelling the aorta. By applying this methodology to the study of laryngo-tracheal disorders, it is possible to establish the relevant pre-treatment measurements (length, diameter, degree of narrowing). This preliminary study has been carried out in 8 cases, in parallel with their clinical treatment. It has allowed us to single out the 3 typical examples which are presented in detail, and to show the advantages of this new approach: immediate and precise measurements, presentation which it is not possible to achieve with conventional techniques of 3-dimensional imaging, and demonstration of the degree of encroachment of the externe stenoses. When taken as part of the management of the patient, this technique complements the findings of real endoscopy, or replaces them, thus reducing the costs of hospital admission and the risks inherent in this procedure.