Testicular neoplasm Testicular adrenal rest tumor 2017-05-04T10:21:37Z Testicular adrenal rest tumour Testicular adrenal rest tumor (TART) is a abenign tumor of the testis. TART generally occurs multiply and bilaterally within the rete testis. Histologically, TART resemble adrenocortical tissue, which led to the name. The tumous are not encapsulated and consist of sheets or confluent cords of large polygonal cells with abundant eosinophilic cytoplasm.