How is torsion of testicular/epididymal appendages?

The appendix testis, a müllerian duct remnant, and the appendix epididymis, a wolffian remnant, are prone to torsion in adolescence Presentation is variable from mild to severe pain similar to a testicular torsion . If the patient is seen early , the infarcted appendage is visible through the skin as a "blue dot sign“ Miscellaneous etiologies of scrotum swelling : idiopathic , Henoch-Schonlein purpura