This paper is to report the result of using ELISA to detect HBsAg-IgM complex in the serum of patients with viral hepatitis B. A series of serum samples of 35 patients,including 29 acute,2 subacute severe and 4 chronic active cases were tested. 28 normal individuals were also tested as control.HBsAg-IgM complex was discovered in the sera of all the patients in the first one or two weeks of hospitalization. It disappeared from the sera of 24 patients (among whom 10 have been followed up for more than 3 to 6 months) who recovered completely after 4 weeks of treatment. The disappearance of the complex occurred long before the clearance of HBsAg and the returning to normal levels of other biochemical parameters. In 5 cases of acute hepatitis with the tendency to be chronic and in those subacute and chronic cases,HBsAg-IgM complex delayed to disappear and could be found in the sera even 6 months later. All the normal controls were negative.It is suggested that the detection of HBsAg-IgM complex in the serum of hepatitis B patient may be used not only as a criterion to evaluate the prognosis of acute cases but also as an index to determine whether the patient is suffering an active disease process.

Objective To explore the image features of benign fibrous histiocytoma of bone and its correlative differential diagnosis.Methods Nine cases of benign fibrous histiocytoma of bone were retrospectively analyzed by comparing the imaging findings with surgical and pathological results.Results In all 9 cases,the tumors were single,ranged from 10 mm?15 mm?20 mm to 50 mm?50 mm?60 mm in diameter,which appeared as round or oval destruction with clear border in the bone,neither calcification nor ossification.The border of tumors in 5 cases was accompanied by integrated sclerosis ring with homogeneous thickness.There were expanding changes in 6 cases,no expanding changes in 3 cases.4 cases underwent MRI,2 cases were homogeneous,low signal on both T1WI and T2WI,and 2 cases were low signal on T1WI and high signal on T2WI with low signal sclerosis ring in circumference.There were no periosteum reaction and soft-tissue tumor in 9 cases.Conclusion X-ray,CT and MRI are valuable in the diagnosis of benign fibrous histiocytoma of bone,for some typical cases,the correctly diagnosis of it can be made before operation.