Benign and malignant sinonasal lesions with intracranial extension: differentiation with MR imaging.
Most sinonasal lesions that extend into the anterior cranial fossa are malignant tumors. However, benign inflammatory polypoid disease can also rarely be manifested in this manner. Fourteen surgically proved cases of such benign and malignant disease were studied with magnetic resonance (MR) imaging. The appearances of the benign and the malignant lesions were quite different and allowed the seven chronic polypoid lesions to be distinguished from the tumors. The benign lesions had nonhomogeneous appearances on MR images due primarily to varying degrees of free-water resorption and protein concentration. The tumors had primarily homogeneous low-to-intermediate signal intensities due to their highly cellular composition.
Department of Radiology, Mount Sinai Medical Center of CUNY, New York.
P M
PM
Som
W P
WP
Dillon
G
G
Sze
M
M
Lidov
H F
HF
Biller
W
W
Lawson
D002294:Carcinoma, Squamous Cell / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging; D009668:Nose Diseases / Q000175:diagnosis*; D009669:Nose Neoplasms / Q000175:diagnosis*; D010254:Paranasal Sinus Diseases / Q000175:diagnosis*; D010255:Paranasal Sinus Neoplasms / Q000175:diagnosis*; D012886:Skull / Q000473:pathology*