As with all medical conditions, there may be many causal factors. Further relevant information on causes of Torsion may be found in:
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Normally, the tunica vaginalis envelops the testis and attaches to the epididymis and spermatic cord. In intravaginal torsion (the most common type of testicular torsion in adolescents), testicular twisting may result from an abnormality of the tunica, in which the testis is abnormally positioned, or from a narrowing of the mesentery support. In extravaginal torsion (most common in neonates), loose attachment of the tunica vaginalis to the scrotal lining causes spermatic cord rotation above the testis. Typically, there’s no history of trauma, and the pain occurs suddenly. A sudden forceful contraction of the cremaster muscle may precipitate this condition. (See Extravaginal torsion.)
Source: Professional Guide to Diseases (Eighth Edition), 2005
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