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The relationship between cerebral palsy and cryptorchidism
J A Smith1, J M Hutson, S W Beasley
1Department of General Paediatrics, Royal Children's Hospital, Melbourne, Australia.
Insights
This study suggests that the position of testes in boys with cerebral palsy does not change with age, unlike in typically developing children. This finding questions early hypothalamic-pituitary-gonadal axis damage theories and points to cremaster muscle spasticity as a cause of cryptorchidism in cerebral palsy.
Area of Science:
- Pediatric Neurology
- Urology
- Developmental Biology
Background:
- Cryptorchidism, or undescended testes, is frequently reported in children with cerebral palsy.
- Previous theories suggested early damage to the hypothalamic-pituitary-gonadal axis causes testicular maldescent in cerebral palsy.
Purpose of the Study:
- To investigate the association between cerebral palsy and cryptorchidism.
- To examine testicular position changes with age in boys with cerebral palsy compared to controls.
- To evaluate the validity of existing theories on the etiology of cryptorchidism in cerebral palsy.
Main Methods:
- Comparative study involving 50 boys with cerebral palsy (divided into two age groups: <2.5 years and 5-10 years) and age-matched controls.
- Assessment of testicular position relative to age in all study groups.
Main Results:
- Testes position remained static with age in boys with cerebral palsy.
- In typically developing children, testes descended slightly with age (P < .005 initially, P < .001 with further growth).
Conclusions:
- The findings challenge theories implicating early hypothalamic-pituitary-gonadal axis damage in cerebral palsy-associated cryptorchidism.
- Spasticity of the cremaster muscle is postulated as a potential cause for apparent increased cryptorchidism in older boys with cerebral palsy, leading to testicular retraction.
Abstract:
This study examined the reported association between cerebral palsy and cryptorchidism. A comparison was made among 25 boys with cerebral palsy under the age of 2 years and 6 months, 25 boys with cerebral palsy aged between 5 and 10 years, and age-matched controls. The testes remained in the same position with age in boys with cerebral palsy, whereas in normal children the testes were slightly lower initially (P less than .005) and became lower still with growth (P less than .001). This result, taken in conjunction with previous studies, casts doubts on the theories of early damage to the hypothalamic-pituitary-gonadal axis as the cause of maldescent in cerebral palsy. It is postulated that any apparent increase in cryptorchidism in older patients with cerebral palsy may be caused by spasticity of the cremaster muscle leading to pathologic retraction of the testis out of the scrotum.