CT diagnosis of malignant tumor in nasal cavity and paranasal sinuses

Objective To explore the CT features of malignant tumor in nasal cavity and paranasal sinuses.Methods CT images of 45 patients with malignant tumor in nasal cavity and paranasal sinuses with pathological verification were retrospectively analyzed.Results Carcinoma located in nasal cavity and paranasal sinuses were 20 cases and most of lesions(14/20) appeared inhomogeneous mass.Adjacent structures in(34/20) or out of the cavity(20/20) were involved in the formation of tissue mass.Obvious bone destruction was found in lesions in 18 cases which featured by bone structure chips or defects,but the swelling of tissue around noses and check was not often showing(2/20).Sixty cases were T-cell lymphoma and most of lesions(11/16) arisen from nasal vestibule,mainly consisting of mixed type(11/16),density of multiple lesions(12/16)were homogeneous.The structure in cavity mainly involved(36/18),but the swelling of tissue around noses and check was often showing(8/16).All 5 cases T-cell lymphoma showed no or mild bone destruction showing bony absorption.One case of malignant schwannoma and 2 cases of B-cell lymphoma were similar appearances to carcinoma.One case of osteoid tissue was found in lesion of osteogenic sarcoma.CT signs were not characteristic in 4 cases malignant melanoma.Conclusion It is available to indicate the circumstances of tumor lesions and to identified diagnosis in nasal cavity and paranasal sinuses by CT.Some tumors as well malignant lymphoma in the nasal cavity and paranasal sinuses are relative characteristic on CT images,which can be diagnosed in some degree.