Purpose
Uncommon sinonasal benign neoplasm: 0,5-4% of all nasal neoplasms3 particularities:-Locally agressive-Tendancy to recur: 10-25%*-Association with squamous cell carcinoma: 4-14%**The purpose of this study is to illustrate the CT and the MRI features of inverted papilloma*: Roobottom, Clinical Radiol, 1995**: woodson, Arch otolaryngol, 1995
Methods and Materials
*Study design: retrospective*23 patients: 21 male – 2 female*Mean age: 53 years (ranged from 24 to 78 years*Recurrent inverted papilloma: 2 cases*Previous surgical procedures in the sinunasal cavities: 0*Signs and symptoms:-Unilateral nasal obstruction (n=21)-Rhinorrhea (n=9)-Epistaxis (n=5)*Average duration of signs: 2 years and half*Endoscopic examination: lobulated (n=23), translucid (n=16), friable and often hemorrhages when manipulated (n=7) tumor*Tumor location:-Nasal wall (n=16)-Maxillary sinus (n=5)-Ethmoid complex (n=2)*CT scan-Performed in 20 patients-Coronal and axial images-Contrast enhanced CT in all patients-Soft tissue and bone windowing*MRI-Performed in 16 patients-Axial and coronal SE...
Results
RESULTS:CT scan*Unilateral polypoid mass-Hypodense (n=20)-Heterogeneous enhancement (n=20)-Associated with bone erosion (n=12)*Location:-Nasal wall (n=15)-Maxillary sinus (n=4)-thmoid complex (n=1)Coronal CT scan showed a soft-tissue mass involving the right nasal fossa (cross), with contiguous extension into maxillary sinus and ethmoidal cells . Ethmoidal infundibulum is enlarged.Note sclerosis of lateral and inferior walls of maxillary sinus, and thinning of the inferior wall of the orbit. The tumor erode the lamina papyraceaAxial and coronal CT scan showed a large right nasal mass beneath middle meatus, with extension through eroded medial...
Conclusions
*Benign epithelial neoplasm*Recurrences+++ then Postoperative follow-up*Associated carcinoma: 5-15%CT:-Non specific-Difficulties in distinguishing between inflammation and tumorMRI:-Delineation of tumor extension-First exam in recurrences-Columnar and lobulated aspects distinctive but not pathognomonic