MSCT features of gastric schwannoma and misdiagnosis analysis / 实用放射学杂志

ABSTRACT

Objective To explore the MSCT features,diagnostic values and the misdiagnosis causes of gastric schwannomas.Methods T he CT images,pathological and clinical data of 9 misdiagnosis cases of gastric schwannomas were analyzed retrospectively,which were later confirmed by the operation and pathology.The study examined the CT findings in the following aspectsthe lesion location, size,contour,border,growth pattern,enhanced pattern,hemorrhage,necrosis,calcification,and the presence and absence of perirenal lymph nodes.Results The gastric schwannomas were ovoid or round,with well-defined boundaries.Tumors were found in the gastric body in 6 cases(4 cases in the large gastric curvature and 2 in the small gastric curvature),the gastric antrum in 2 cases and the gastric fundus in 1 case.The largest lesion diameters ranged from 2.5 to 7.4 cm,with an average diameter of 3.2 cm.Extracavitary growth was found in 2 cases,intracavitary growth in 2 cases and both intracavitary and extracavitary growth in 5 cases.The density of the tumor was low and evenly distributed,without cystic change,necrosis or calcification.2 cases were found to have ulcer formation. Another 2 cases were found to have enlarged lymph nodes,which were pathologically confirmed to be reactive hyperplasia.In the CT contrast enhancement,mild homogeneous enhancement was found in 4 cases in the arterial phase,but no obvious enhancement was found in the other 5 cases.In the venous phase,all the cases were found to have moderate homogeneous enhancement.4 cases were found to have further enhancement in the delay phase.Conclusion The gastric schwannomas appears to be homogeneous soft tissue mass on the MSCT,with clear boundaries and low-density and without hemorrhagic necrosis or cystic lesions.MSCT examination can help to locate and characterize gastric schwannomas,and to observe the relationship between the tumor and the surrounding tissue structure.