Dynamic Contract-Enhanced MRI Study of Perfusion Change in SHCC / 实用放射学杂志

Objective To study the manifestations of perfusion change in small heptic cell cancer(SHCC) on dynamic contract-enhanced MRI. Methods 18 cases of SHCC(21 lesions) proved by pathology were presented. Dynamic contrast-enhanced MRI was performed using 2D T_1-turbor-FLASH sequence for 18 SHCC.Results Among all 18 cases of SHCC, 17 cases were obvious enhanced, and one case was no enhancement. In 17caese of enhanced tumors, the maximal peak of enhancement was in the first set (6~23 s) in 2 cases and in the second set (33~51 s) in 15 cases. The average maximal peak of contrast-enhanced time was 42.5 s(23~50.5 s),and the average maximal peak of signal intensity increased up to 30.5 (19.5~45.0). The pattern of time-intensity curve was rapid wash-in followed by washout in 17 cases.Conclusion Dynamic contract-enhanced MRI is important on study and diagnosis of SHCC.

CT Diagnosis of Dermoid Cyst of the Orbit / 实用放射学杂志

Objective To study the CT findings of dermoid cyst of the orbit.Methods Four cases of dermoid cyst of the orbit proved by operation and pathology were presented. There were three cases of male, one case of female, age 6～21 years. Transverse CT scans(3 mm slice) and coronal CT scans(5 mm slice) were obtained, in which enhancement study was done in two cases.Results Among four cases, lesion was located in the right on three cases, in the left on one case. All lesions were located outside the muscle of upper-lateral guarter. One lesion was showed a multi-lobular shape, with widening of the frontozygomatic fissure and protruding to outside of the orbit. Three lesions were found anoval shape, in which one lesion was showed a bony sclerosis and thickening, another two cases were showed no bony change. On all cases, the edge of the lesions were demonstrated clearly, in which three cases were low-density(-140～-80 HU) similar to fat density, and one case with heterogeneous density. The lesion was showed more clearly on enhancement study on two cases.Conclusion CT findings of dermoid cyst of the orbit is characteristic and the diagnosis can be made before operation.