| Objective To explore the findings of X-ray and MRI of schwannoma and their application value in clinical diagnosis of schwannoma. Methods Retrospective analysis was performed in 27 patients (27 lesions) with schwannomas who were admitted to the Fourth Affiliated Hospital of Guangzhou Medical University and the Second Affiliated Hospital of Guangzhou Medical University between January 2012 and March 2016. The X-ray and MRI findings and key points of differential diagnosis were summarized. Results The main X-ray findings of schwannoma were soft tissue swelling and masses, may be accompanied by pethological calcification. The main X-ray finding of schwannoma of the bone were local single cystic and quasi-circular changes, generally without calcification or ossification. The main findings of malignant cases were fuzzy boundaries, with sclerotic margin, normal cortex/medulla transition zone obviously widened, tumor breaking into cortex, involvement of surrounding soft tissues and disappeared fat gap. The main findings of benign cases were clear boundaries, thinned cortex, sclerotic margin, without involvement of surrounding soft tissues. Enhanced MRI of schwannoma showed that lesions were with a complete capsule, target signs and nerve out-in signs. Malignant cases showed equal signal on T1WI and high signal on T2WI mixed signal; Benign tumors showed inhomogenous signal, with equal signal on T1WI, high, low and mixed signal on T2WI.Conclusion MRI has good definition to high soft tissues. Multidirectional and multi-parameter imaging can accurately display the size, shape and edge of tumor and the relationship with surrounding tissues, of which the diagnostic effect is superior to X-ray. The related signs need to be observed and identified during the diagnosis. |
