Objective To sum up the imaging features of tuberous sclerosis.Methods CT and MRI findings of brain in 20 patients with tuberous sclerosis proved by clinic,imaging or pathology were retrospectively studied. Results Among 20 cases,on CT,the lesions appeared as subependymal calcified noduli in 16 cases (multiple noduli in 14 cases and single nodule in 2) and subependymal uncalcified noduli in 2,the noduli were 2~12 mm in diameter,2 cases were normal.On MRI,the subependymal noduli were multiple in 19 cases and single in one case,the noduli were iso-or hypointensity on T1WI and iso-,hypo or hyperintensity on T2WI.In addition,the lesions within cortical or sub-cortical matter were demonstrated by MRI in 19 cases,and the abnormal signals were showed in local patterns of cortical tubers.The abnormal findings of white matter were radial linear or wedge-shaped or irregular type in 7 cases.The subependymal noduli were enhanced,and the most of cortical lesions were not enhanced after contrast-enhanced MR scans in 9 cases.Conclusion There are characteristic findings of tuberous sclerosis both on CT and MRI.

Objective To discuss the effect of CO2 artificial pneumoperitoneum on the invasion of the endometrial cancer in nude mouse resulted from the transplantation of the cancer cells and its mechanism.Methods Thirty nude mice were divided into 3 groups based on the time in the CO2 pneumoperitoneum circumstance.Control group: the small intestine of the nude mouse was exposed in air for 5 min,and the cancer cells were injected into right lower quadrant after suture.The gas was depleted after 40 min.40 min group: CO2 gas was poured into abdominal cavity to form a 4 mmHg artificial pneumoperitoneum for 5 min before cancer cells were injected into right lower quadrant.The gas were depleted after 40 min.80 min group: CO2 gas was poured into abdominal cavity to form a 4 mmHg artificial pneumoperitoneum for 5 min before cancer cells were injected into right lower quadrant.The gas were depleted after 80 min.The time that each group took to form a solid tumor was recorded.Four weeks later,the transplantation tumors were taken out and sliced into frozen sections and paraffin-embedded sections.The expression of ?1-intergrin and E-cadherins was detected by IMF.Results The time taken to form the solid cancer was shorter in the 40 min group and 80 min group than in the control group,with more blood vessel found(P0.05).Conclusion The CO2 pneumoperitoneum could enhance the abilities of invasion and adhesion of endometrial cancer cells,which is associated with the expression changes of ?1-intergrin and E-cadherins in the cancer cells.

Objective To investigate the effect of CO2 pneumoperitoneum on the cell adhesion capability of cultured endometrium cancer cells.Methods After treated in a pneumoperitoneum model for 4 h,the changes in cell growth and adhesion of the endometrium cancer were detected by MTT.The expression of ?1-integrin and E-cadherin in the cancer cells were compared with the control that were not treated with CO2,by the immunohistochemical method.Results After treated with CO2 for 4 h,the cell growth was enhanced and the cell adhesion capability increased as compared with the control group.At the same time,the expression of ?1-integrin and E-cadherin was lower in treated cells than that in untreated ones.Conclusion The adhesion capability of endometrium cancer cells in CO2 pneumoperitoneum could be enhanced by the reduction of the expression of ?1-integrin and E-cadherin,and thereby influences the metastasis of cancer.

Objective To summarize imaging appearances of brain in AIDS patients,as to supply the evidences of imaging diagnosis for this disease . Methods CT or/and MRI appearances of brain in 19 patients with AIDS of nervous system type were reviewed . Results 3 cases showed the symmetry signal abnormal in bilateral whiter matter and 2 cases showed brain atrophy in 5 patients with HIV encephalitis.2 cases of toxoplasma encephalitis appeared multiple abnormal density or/and signal intensity in the brain and multiple ring enhancement . 3 patients with lymphoma displayed single or multiple nodule in the brain and nodular-enhancement or inhomogenous enhancement.3 patients with brain infarction displayed lower density in the basal ganglia on CT.2 patients with progressive multifocal leukoencephalopathy displaied multiple patch abnormal signal intensity of the white matter in frontal and parietal lobus.1 patient with cryptococcal infection showed abnormal signal and ring enhancement of the pons.1 patient with cryptococcal meningitis and 2 patients with intracranial hypertension had not abnormal imaging appearances.Conclusion Most lesions of the brain in AIDS patient may be detected by CT and MRI,but the definite diagnosis is still in need of combining with clinical appearances and other relative examination.

Objective To evaluate the role of magnetic resonance angiography ( MRA ) in diagnosing peripheral hemangioma andvascular malformation . Methods 61 cases of hemangioma and vascular malformations in peripheral soft tissue were undergone MRAexamination.Results Of 13 patients with hemangioma,the arteries within hemangioma were increased and gradually fine from proximal to distal in 7 cases and in company with arteriovenous fistulae in 2 cases,there were no arteries within hemangioma in 6 cases.Vascular malformations were found in 48 patients,arteries and veins of vascular malformation were showed in 35 cases,but arteries of vascular malformations were only showed in one case.Arteries of vascular malformation were showed in 5 cases and the arteries were pressed on arterial angioyraphy in 23 cases.On MR venography(MRV),the shallow malformed veina were showed in 25 cases and in company with deep malformed veina in 13 cases,only the shallow and deep veina increased and thickness be showed in 2 cases.Arterioveinous fistulae could be seen in 8 cases on MR aterio-venography.There were no vessel be showed in 12 cases within the losions.Conclusion MRA is of significant value in diagnosis and differential diagnosis of peripheral hemangioma and vascular malformations.

Objective To study the manifestations and diagnostic value of MRI for cavernous hemangioma in maxillofacial region.Methods Thirty-one cases of cavernous hemangioma in maxillofacial region proved pathologically were retrospectively analyzed.Results The lesions localized in parotideomasseteric region in 13 cases,in buccal and zygomalicotemporal region in 12 cases,in orbital area in 3 cases and labium in 3 cases.The lesions appeared as ellipse or round-like in 3 cases,fusiform in 2 cases,mass or flat irregular shape in 26 cases.On MRI,20 cases showed long T1 signal intensity,4 cases were slight long T1 and 7 cases were equal T1;on T2WI,27 cases showed high signal intensity and 4 were slight signal intensity.Conclusion The diagnosis of cavernous hemangioma in maxillofacial region can be verified and the shape,the extent of lesion can also be showed by MRI.It provides a reliable basis for clinical diagnosis and operative plan.

Objective To explore the MRI appearances of tuberculosis of myelon and spinal meninges,and to study the value of MRI in diagnosis of this disease.Methods The imaging appearances of tuberculosis of myelon and spinal meninges tuberculosis in 8 cases were reviewed.All cases underwent plain MRI and contrast-enhanced MRI examinations.Results In 8 cases,there were myelonic tuberculosis in 3,myelonic tuberculosis accompanied with spinal meninges tuberculosis in 2 and spinal meninges tuberculosis in 3.Myelonic tuberculosis appeared as intramedullary tuberculous granuloma in 2,granulitis in 1 and tuberculous myelitis in 2.The appearances of MRI were spinal cord swelling,low signal intensity on T1WI and high signal intensity on T2WI.On contrast-enhanced MRI,the lesions were circular enhancement,military nodules or non-enhancement.The typical MRI appearances of spinal meningeal tuberculosis showed spinal meninges generally thickened,narrowing or closing of subarachnoid cavity,on contrast-enhanced MRI,the lesions were tubiform enhancement of sagittal images or circular enhancement of axial images.All cases had active tuberculosis in neighbourhood organ or tissue.Conclusion The MRI appearances of tuberculosis of myelon and spinal meninges are representative,the definite diagnosis of which can be made when the MRI appearances in combination with the history of the patients and the active tuberculosis of neighbourhood organ or tissue.

Objective To explore the clinical and MRI features of spontaneous osteonecrosis of the knee(SONK).Methods 15 patients with SONK diagnosed by clinic and imaging were collected.All of cases were examined by MRI,of them 5 cases underwent CT scan and 3 cases underwent radiographic examinations.Results The subchondral lesions were seen in all cases on MRI and the lesions located in the femoral condyle weight-bearing zone in 14 cases.The subchondral "fracture cleft"sign was found in 2 cases;the subchondral long T1 and short T2 linear abnormal signal intensity surrounding with bone marrow edema were shown by MRI in 3 cases of them.The subchondral focal lesions were slight long T1 and long T2 signal intensity in 10 cases.The subchondral lesion were showed clearly only in 2 cases of 5 cases with CT scan,and only 1 case of 3 cases with plain X-ray examinations.Conclusion MRI is more sensitive than CT and radiography in showing the lesions of SONK.The SONK can be diagnosed based on the clinical and MRI features.

Objective To summary MRI findings and its diagnostic value of Balo's concentric sclerosis .Methods Brain MRI images of 4 cases with Balo's concentric sclerosis were studied with review of the literature in 13 cases.Results MRI showed multiple ring-like lesions within brains in 16 patients and single lesion only in 1.The deep white matters of cerebrum were involved in all patients.The cerebellum and brain stem were invaded in 2 and 4 respectively. Typical concentric sclerosis lesions demonstrated alternate middle and low signal rings on T1WI, middle and high on T2WI. The ring-like lesions were best seen on T1WI. The middle signal rings were enhanced on post-contrast images.The typical multiple sclerosis lesions were seen in 7 patients. Conclusion Balo's concentric sclerosis has characteristic findings on MRI.MRI is a very reliable diagnostic methed for this disease.

A method for the determination of caffeine in urea was developed based on bubble-in-drop single drop microextraction (BID-SDME) followed by gas chromatography/mass spectrometry (GC-MS).Under the optimum conditions including chloroform as extraction solvent, an exposure volume of 1 μL, a bubble volume of 1.6 μL, stirring for 5 min at 300 r/min, 15% (m/V) NaCl, and a distance of 1 cm between bubble and stirring bar, the detection limit of this method was as low as 0.003 mg/L and the linear range was from 0.005 mg/L to 10 mg/L with correlation coefficient of 0.982.The recoveries of caffeine were from 89.2% to 107.5% at different spiked levels in human urine and the relative standard deviation (RSD, n=6) was less than 8%.