Original InvestigationsPronounced Cystic Transformation of the Rete Testis MRI AppearanceMEYER, DIRK-ROELFS MD*; HÜPPE, THOMAS MD*; LOCK, UWE MD†; HODEK, ELLEN‡; FRIEDRICH, MICHAEL MD*Author Information From the Departments of *Radiology and Nuclear Medicine, †Urology, and ‡Pathology, Academic Teaching Hospitals, Free University of Berlin, Germany. Received February 1, 1999, and accepted for publication, after revision, April 8, 1999. Reprint requests: Dr. Dirk-Roelfs Meyer, Krankenhaus am Urban, Abteilung für Radiologie und Nuklearmedizin, Dieffenbachstr. 1, 10967 Berlin, Germany. Investigative Radiology: September 1999 - Volume 34 - Issue 9 - p 600 Buy Abstract Meyer D-R, Hüppe T, Lock U, Hodek E, Friedrich M. Pronounced cystic transformation of the rete testis: MRI appearance. Invest Radiol 1999;34:600–603. BACKGROUND. Cystic transformation of the rete testis is a little-known partial or complete obstruction of the spermatozoa-containing secretion of the head of the epididymis. Depending on its severity, either ectasia or a cystic transformation occurs, which spreads to the network of convoluted seminiferous tubules in the mediastinum testis. Findings in contrast-enhanced MRI examinations are characteristic and may help to differentiate this benign entity from malignant neoplasia. The authors present two pronounced cases in different stages, documenting the broad spectrum of possible involvement. © 1999 Lippincott Williams & Wilkins, Inc.