Hypospadias is the most common congenital abnormality affecting the male urethra, with a worldwide incidence of about 1:300 live male births. Hypospadias is the abnormal location of the urethra on the ventral surface of the penis   .
The etiology of hypospadias in the majority of cases remains unknown. There is a genetic background for hypospadias through studying and observing genetic syndromes associated with hypospadias, genetic defects in the biosynthesis and function of Androgen and the mood of monogenic inheritance in families with hypospadias     .
However, fewer than 5 percent of all cases of hypospadias may be associated with such conditions. In addition to a family history of hypospadias, only a few risk factors associated with hypospadias have been found, for example, paternal subfertility and intrauterine growth retardation    .
The goal of hypospadias repair is to create a straight penis with a slit-like meatus at the tip of the glans and a urethra of uniform caliber and adequate length, reconstructing a symmetrical glans and penile shaft and achieving projectile stream and normal erection  .
2. Case Report
Four cousin children were presented to our outpatient clinic, complaining of dribbling of urine and inability to pass a forward urine stream.
From history, there is positive consanguinity as their parents were 2 sisters (with a history of parental consanguinity) married to 2 brothers. No family history of similar conditions, nor medication history during pregnancy (See Table 1).
The first parents have 5 sons, 2 of them were with hypospadias; the first child was 10 years old, with distal penile hypospadias, his brother was 2.5 years old with sub-coronal hypospadias.
The second parents have 7 children, 3 of them are boys, 2 with hypospadias; the first boy was 9 years old with sub-coronal hypospadias. His brother was 2.5 years old with glanular hypospadias.
The 4 children underwent Snodgrass repair, in 3 of them we used preputial flap and the 4th one Dartos flap as a second intervening layer.
Post-operative hospital stay was 10 days, Catheter removed before discharge, urethral dilatation started immediately with frequency of once daily for the first week, then once weekly for the next month. Follow up was done once weekly. There were no complications for 6 months follow up (See Cases 1-4).
Table 1. Showing patient data and procedures done.
Case 1. Distal penile pre- and post-operative photos.
Case 2. Sub-coronal hypospadias pre-operative photo and post-operative video.
Case 3. Sub-coronal hypospadias pre- and post-operative photos and video.
Case 4. Glanular hypospadias.
The inheritance appears to be transmitted equally through the paternal and maternal sides of a family. In studies of twin pairs, Kallen et al.  found a concordance rate of 18 percent, whereas another study reported concordance rates of 9 percent and 27 percent for dizygotic and monozygotic twins, respectively  .
Brothers of a hypospadias case have, in smaller descriptive or case-control studies, been estimated to have about a 9 percent chance of developing hypospadias. It was found that the more severe the hypospadias in an individual, the higher the incidence in first-degree relatives, ranging from 3.5 percent to 16.7 percent  .
It was found that hypospadias in second- and third-degree relatives was inherited equally from the maternal and the paternal sides. It has previously been hypothesized that hypospadias is one symptom of the testicular dysgenesis syndrome, which may be increasingly common because of adverse environmental influences, for example, estrogenic or anti-androgenic substances  .
Here, consanguinity might be a cause of familial hypospadias and it was apparent in the second-generation members without previous history of similar conditions, so parents were notified with the increased risk of having grandsons with hypospadias and good prenatal care was advised in the future.
Although there is high heritability of hypospadias that also aggregates within the second and third-degree relatives, environmental factors may play a principal role in causing familial hypospadias.
Hypospadias repair has a long learning curve. The continuous auditing should be done to improve the results.