Diagnosis of sinusitis lesions Imageology _1776 -

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Diagnosis of sinusitis lesions Imageology

. Weighted sinus mucosal thickening as the high signal,[link widoczny dla zalogowanych], air and bone was low signal on the T-weighted image of thickened sinus mucosa showed low signal. In humans, each of 5o minutes to 6 hours each side of the turbinate, nasal septum and ethmoid sinus mucosal edema appeared in a cyclical, so lonely mucosal thickening of the screen may not be 1 ~ 2mm of inflammatory lesions by 29 but had a normal nasal cycle of congestion and edema. Turbinate on both sides of the same size, the signal difference is not an exception. When using MR diagnosis of sinusitis, the nasal anatomy of 13 to 63 patients with MR images showed asymmetric abnormalities, CT is a major change on the week of sinus mucosal thickening,[link widoczny dla zalogowanych], followed by mucus retention cyst. As the air in the MR images of bone and no signal on reflection,[link widoczny dla zalogowanych], can not form surgical illustrations, so MR is not in the surgical design purposes. Another problem is the MR signal intensity and sinus secretions. Som such that the signal strength of sinus secretions, and movement quality with the protein concentration changes in sub-corresponding changes occur, so the signal of the image will nasal secretions of four classified as: ① When the liquid in the total protein concentration 28 when T, T. Weighted image showed low signal on. As the fourth case, a high protein concentration near the solid discharge in the T, T. Weighted the same as the gas were tested on and no signal zone. Completely in the MR images may be misdiagnosed stuffy nose rustic. Very high protein concentration in the evaluation of a mucus cyst patients may be misdiagnosed. In osteoma, originated in the tooth tissue disease,[link widoczny dla zalogowanych], osteochondroma, fibrosis, fungal sinusitis T, T-weighted image with no signal area were tested and, therefore, MR examination is a potential problem. Sinus due to chronic obstructive pulmonary secretions can signal changes in the above four images of any kind, relying solely on the difference between the image signal change or a tumor inflammatory lesions difficult. Therefore, Gd-DTPA enhanced peripheral inflammatory disease is prompted not Tumors reliable signs of a CT or MR can not accurately determine the fibrosis after surgery or the inflammatory lesions, because both can enhance the performance of membrane thickening and fools. Although the complications of nasal inflammation match the display with simple sinusitis MR there is a limit, but the complications of sinusitis in the diagnosis of intracranial or intraorbital foreign 3O Clinical Radiology Volume 1, 1995 there is a large fault potential. Complications of sinusitis include meningitis, thrombotic phlebitis,[link widoczny dla zalogowanych], subdural empyema, orbital abscess, perineural and perivascular spread of inflammation can be clearly demonstrated by the MR. MR has proven meningitis and thrombosis of the diagnosis of phlebitis than CT, the display of the orbital complications of sinusitis, CT and MR have the length. The orbital fat, low density, CT can clearly show the orbital cellular inflammation, use of MR examination, in T. Weighted image showed high signal on fat, orbital cellulitis, the display can be comparable with CT. Although CT shows absence of ethmoid cardboard or inflammatory damage caused by the ethmoid bone wall has some advantages, but the display is not ideal orbital apex. Because the signal of orbital apex bone defects can be clearly demonstrated with MR. In addition, blood flow through the application of gradient echo imaging techniques, MR can show the supraorbital vein, differences in the optic nerve and optic nerve sheath is also available from T-weighted MR image clearly displayed. Under normal circumstances, CT can not distinguish the nerve or the nerve sheath. These advantages of MR in the diagnosis of mucormycosis, aspergillosis, and other progressive fulminant fungal sinusitis when the greater value. Another complication of sinusitis is a mucocele, CT can clearly show the formation of cysts and mucus changes in bone structure, MR can clearly show the lesion with intracranial or orbital structure of the boundaries. Lanzieri reported in MR images such as mucocele was peripheral enhancement on the help and the papilloma or malignant tumors such as differentiated from obstructive secretions. Encephalocele is a birth defect can also be caused by the surgical destruction of sieve plates, especially if the brain swelling down herniate through the defect, the use of CT more difficult to identify inflammation and breast swelling, due to brain inflammation signal strength and nose lonely The signal strength is different from identification with the MR is usually very accurate. In most cases the difference between polyps and cysts is not possible tension, but this distinction is not important, if the doctors know that patients have endoscopic tension cyst mucous, you should pay special attention to OMC, cysts are not important unless it grows to sufficient size before causing obstruction. [YousemDM, e1. a1. Radiology1993; 188 (2); 303 ~ 3l4 (English)]

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