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Bell clapper deformity

Assoc Prof Craig Hacking and Radswiki et al.

A bell clapper deformity is a predisposing factor in testicular torsion in which the tunica vaginalis has an abnormally high attachment to the spermatic cord, leaving the testis free to rotate. Bell clapper deformity predisposes to intravaginal torsion of the testis.

It is best defined as the complete investment of the testis, epididymis and a portion of the spermatic cord by the tunica vaginalis. It has a reported occurrence of 5-16% and is seen bilaterality in 66-100% 3.

History and etymology

The term was first reported in the literature in1932 by Muschat who described the testes “hanging freely in the vaginal sac like a clapper in a bell” 4.

Article information

rID: 15617
Synonyms or Alternate Spellings:
  • Bell clapper's deformity
  • Bell clapper deformities
  • Bellclapper deformity

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Cases and figures

  • Figure 1: normal anatomy
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  • Figure 2: bell clapper deformity
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  • Figure 3: bell clapper deformity with torsion
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  • Figure 4: bell clapper (photo)
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