Background and purpose: Adrenal schwannoma is extremely rare

mostly benign

lack of special characteristics in clinical and imaging presentation. The aim of this study was to analyze the computed tomography (CT) and magnetic resonance imaging (MRI) findings of adrenal schwannoma

in order to improve the accuracy of diagnosis. Methods: The CT and MRI features of 8 patients with pathology-proven adrenal schwannoma were reviewed. Among the 8 patients

4 patients underwent CT scanning

3 patients underwent MR scanning

1 patient underwent both CT and MR scanning. Results: The tumors were located at the left adrenal in 5 cases and at the right in 3 cases. Tumors showed no signs of endocrine activity in all cases. All tumors were well-circumscribed

oval or lobulated masses

2 cases with calcification

5 cases with cystic change

2 cases with intratumoral hemorrhage. CT or MR enhancement showed moderate

heterogeneously delayed enhancement in 7 cases with enhanced capsule. Four cases showed rabbit tail sign. Conclusion: The imaging and pathological features of adrenal schwannoma have certain characteristics. The CT and MRI features

such as intact capsule

cystic degeneration

rabbit tail sign

calcification and progressive enhancement

are helpful to improve the accuracy of diagnosis of adrenal schwannoma.