Prevalence and characteristics of cryptorchidism in a Nigerian district

Molecular genetics of hypospadias and cryptorchidism recent developments

During the last decade, a tremendous amount of work has been devoted to the study of the molecular genetics of isolated hypospadias and cryptorchidism, two minor forms of disorders of sex development (DSD). Beyond the genes involved in gonadal determination and sex differentiation, including those underlying androgen biosynthesis and signaling, new genes have been identified through genome-wide association study and familial clustering. Even if no single genetic defect can explain the whole spectrum of DSD, these recent studies reinforce the strong role of the genetic background in the occurrence of these defects. The timing of signaling disruption may explain the different phenotypes.

The volume of retractile testes

PURPOSE

We used ultrasound to determine the volume of retractile testes in boys and compared these volumes with normative testicular volume values.

MATERIALS AND METHODS

A total of 171 boys were enrolled in the study, of whom 14 were excluded from analysis. The 157 boys included (age 0.8 to 11.5 years) were recruited from 2 different populations. The first subgroup comprised 92 boys previously excluded from a study aimed at obtaining normative values of ultrasonographically scanned testes. The second group included 65 boys who had been referred to our outpatient clinic for nonscrotal testis and who were diagnosed with retractile testis. Testicular volume was measured by ultrasound in a scrotal position or in an inguinal position. Three separate transverse and longitudinal images of each testis were recorded. Length, width and height were measured, and the volume was calculated with the formula for an ellipsoid, π/6 × length × width × height. The highest value of the 3 testicular volumes was determined and taken as the volume measurement.

RESULTS

The volumes measured by ultrasound for the 157 boys with 276 retractile testes ranged from 0.18 to 1.49 ml (mean 0.50). The volumes of the retractile testes were significantly smaller than normative values (p <0.001). Furthermore, the testicular volumes of retractile testes measured in an inguinal position were significantly smaller than those measured in a scrotal position (p <0.001).

CONCLUSIONS

The volumes of retractile testes are significantly smaller than recently determined normative values.

The prevalence, postnatal descent, and complications of undescended testes among children who underwent neonatal circumcision in Benin City, Nigeria

BACKGROUND/PURPOSE

The prevalence, age at postnatal descent, and age at which complications set in and, therefore, prevented by orchidopexy in undescended testes are controversial. This study sought to determine the prevalence, age at postnatal descent, and age at which complications occurred in undescended testes.

METHODS

A prospective study was done on children who underwent neonatal circumcision at the University of Benin Teaching Hospital, Benin City, and Leadeks Medical Centre, both in Edo state, Nigeria, between January 2002 and December 2007. Those diagnosed with undescended testes were recruited for the study and followed up at the surgical outpatient clinic for 2 years; findings were documented on a structured proforma.

RESULTS

A total of 178 neonates aged between 5 and 28 days (mean, 7.6 +/- 4.2 days) and mean weight 3.9 +/- 1.8 kg among 6180 children circumcised had 186 undescended testes. On follow-up, 65 (34.9%) testes mainly among preterm neonates (P = .2450) fully descended within 7 months with no testicular descent recorded thereafter. Prevalence rates of 2.9% in neonates and 1.8% at 2 years old were recorded. Reduction in testicular volume, epididymoorchitis, and testicular torsion were recorded in 52 (28%) undescended testes between 12 and 24 months on follow-up.

CONCLUSION

Neonates with undescended testis should be observed for postnatal descent at least 7 months but may be offered orchidopexy before 1 year.

The frequency of undescended testis from birth to adulthood: a review

We performed a systematic review and critique of the literature on the frequency of undescended testis (UDT) among boys from birth to adolescence. Special attention was given to whether previous testicular position was taken into account to distinguish between congenital and acquired UDT. We searched Medline, Embase, Cinahl and the Cochrane Library. Any study reporting on the frequency of UDT was included. Study population age, number of boys studied, period of examination, primary examiner, area of study, study design, ethnicity, definitions used and previous testicular position were analysed. A total of 46 studies met the inclusion criteria. Twenty-three of the 46 (50%) studies involved newborns. Definitions were described in half of the studies; however, the definitions used were heterogeneous. Previous testis position was described in 11% (5/46) of the studies. At birth, in term and/or birth weight >2.5 kg infants, the UDT rate ranged from 1.0 to 4.6%, and in premature and/or birth weight <2.5 kg infants from 1.1 to 45.3%. At the age of 1 year UDT in term and/or birth weight >2.5 kg infants was seen in 1.0-1.5%, at 6 years in 0.0-2.6%, at 11 years in 0.0-6.6% and at 15 years in 1.6-2.2% of boys. The frequency of UDT shows variable figures in the literature. The actual frequency of acquired UDT essentially remains unclear because of the shortage of studies performed at an older age, and of studies reporting on previous testicular position.

Prevalence of acquired undescended testis in 6-year, 9-year and 13-year-old Dutch schoolboys

OBJECTIVE

To investigate the prevalence of acquired undescended testis (UDT) in Dutch schoolboys.

DESIGN AND PARTICIPANTS

As a part of routine school medical examinations, during a 2-year period (2001-3), testis position was determined in 6-year, 9-year and 13-year-old schoolboys. Before the examination, a parent questionnaire was sent inquiring both about the position of the testes and whether the child had been admitted earlier to hospital for orchidopexy. In 6-year and 13-year olds, a physical examination was performed by the school medical officer; in 9-year olds, a school nurse interview was held. Each boy for whom there was any doubt of the scrotal position was referred to the hospital for examination of both testes.

SETTING

Institution for Youth Health Care "Noordkennemerland" and Medical Centre Alkmaar, Alkmaar, the Netherlands.

RESULTS

Testis position was determined in 2042 boys aged 6, 1038 aged 9 and 353 aged 13. Of these, 47, 53 and 8 boys, respectively, were referred to the hospital and seen for further evaluation. The diagnosis of acquired UDT was made in 25 boys aged 6, 23 aged 9 and four aged 13. In 33 boys, a congenital UDT was diagnosed; 32 (97%) had already been diagnosed and treated at an early age.

CONCLUSIONS

The prevalence of acquired UDT for 6-year, 9-year and 13-year olds was, respectively, 1.2% (25/2042), 2.2% (23/1038) and 1.1% (4/353). In addition, congenital UDT is treated during the early years of life and, in contrast with popular belief, screening programmes for detecting UDT in the early years are successful.