Objective To evaluate the CT features of the uncommon neoplasms of the paranasal sinuses and nasal cavity and related differentiate diagnosis.Methods CT manifestation of 26 cases with uncommon neoplasm of the paranasal sinuses and nasal cavity confirmed by histopathology were retrospectively analyzed and compared with 9 cases of common malignant neoplasm. Results All cases had soft-tissue mass with sinusitis in most cases (27/35).In benign group, 7 cases appeared as common benign tumor except for the hemangioma with marked enhancement and meningioma with calcification . In the malignant group, melanoma was small in volume and malignant granuloma was in infiltrative growth .The others had common appearances of malignancies.Conclusion CT signs are not characteristic in most cases compared with the common neoplasms. Surface configuration, bony change and circumstances are the main considerations in differentiate diagnosis and should be related to clinical and pathological materials..

Objective To explore the imaging characteristics of hepatic primary leiomyoma.Methods The CT and MR imaging findings of three pathologically proven primary leiomyoma of the liver were analyzed,and the correlation between the imaging features and pathological results was analyzed.Two patients underwent CT scanning.Two patients underwent MRI.Results The lesions appeared hypodense in CT images,and with elongated T_1 time and elongated T_2 time in MRI.One lesion was homogenous both in CT and MRI,with significant homogenous enhancement.The other two lesions were inhomogeneous,with inhomogeneous enhancement in one lesion.All the three lesions had the sign of pseudocapsule.Neither hepatic cirrhosis nor venous tumor emboli were present.Pathological examination showed proliferation of spindle- shaped neoplastic cells and hyperplasia of capillary.One tumor had central hyalinization and another tumor had central necrosis.Conclusion Primary leiomyoma of the liver is one kind of hypervascular tumors with pseudocapsule.CT and MR can provide helpful information to the diagnosis.

Objective To analyze the features of intracrayze the features of intracranial cystic diseases on ~1H MRS,and to evaluate the applicable value of ~1H MRS.Methods Fifty-two patients were examinated by single voxel ~1H MRS,included Ⅰ-Ⅱ graded astrocytomas(n=8),glioblastomas(n=9),metastasis(n=13),brain abscesses(n=10),epidermoids(n=4),anachnoid cysts(n=5),brain Cysticerciasis(n=3).Results(1)There was only Lac in Ⅰ-Ⅱ graded astrocytomas.But in glioblastomas,as were as all showed Lac,4 cases showed low Cho and NAA and 2 cases Lip.(2) In(13 metastasis) patients,7 cases only presented Lac,6 cases showed Cho,3 cases showed low NAA and(6 ones) Lip.(3) In brain abscesses,all showed Lac,9 cases displayed AA,6 cases showed Ace,5 cases appeared Suc and Ala,2 cases had Lip.(4) Four cases of epidermoid showed Lac,one showed Lip.In(4 arachnoid) cysts,2 cases had low Lac,one showed Lip.Three cases of cysticerciasis showed Lac,Ace,Suc,Ala and no AA,Cho,NAA.Conclusion Lac is the most common resonance peak on ~1H MRS in intracranial cystic diseases and for no diagnostic specificity.AA combined Ace,Suc,and Ala are highly specificity for brain abscess.Ace,Suc and Ala appearance cues the the possible existence of cysticerciasis.~1H MRS is helpful for the qualitative diagnosis of intracranial disease.

Objective To analyze the DWI characteristics of intracranial epidermoid cyst (ECs),and to evaluate “T2 shine-through” effect. Methods There were 15 cases of ECs confirmed by pathology, in which 3 cases had the residual tumor after surgery. The ADC value was measured in ECs,deep white matter and CSF,and the comparison was made between DWI and FLAIR in showing the tumors. Results (1) The lesions in 15 cases were high intensity on DWI, their ADC value was from 0.80?10 -3mm2/s to 1.23?10 -3mm2/s, the average was (1.05?0.14)?10 -3mm2/s. But the ADC value of deep white matter was from 0.74?10 -3mm2/s to 1.09?10 -3mm2/s, the mean was (0.88?0.09)?10 -3mm2/s. The ADC value of CSF was from 2.98?10 -3mm2/s to 3.78?10 -3mm2/s,the mean was (3.31?0.21)?10 -3mm2/s. The ADC value of ECs was significant lower than that of CSF ( P