<prompt> All of the following abnormalities are predisposing causes for torsion of the testis exceptInversion of testisLow investment of tunica vaginalisBetween 10 to 25 years of ageSeperation of the epididymis  <response>: Predisposing factors for torsion testis are: Inversion of the testis. High investment of the tunica vaginalis which acts like a mesentry through which testis rotates. Here testis hangs like a clapper in bell. Presence of gap between the body of the testis and epididymis, as a result of which testis twists over epididymis. Heavy straining often ppts torsion dt vigorous contraction of the cremaster which is attached spirally. Reference : page 1082 SRBs manual of surgery 5th edition 