Above is the normal uncircumcised
The image is generated with child obliqued.
 
A. Ridge created by the bladder trigone
B. Sphincter
C. Site of the verumontanum
D. Prostatic urethra
E. Membranous urethra
F. Bulbous urethra
G. Penile Urethra
H. Fossa navicularis
J. Urine beneath Foreskin
Normal uncircumcised
Other Normals
 
 
 
 
 
 
 
 
Stricture
  1. 1.Posterior Urethral Valves
 
A
BC
 
D
E
F
H
G
J
 
 
The foreskin is a retractable double-layered fold of skin and mucous membrane that covers the glans penis and protects the urinary meatus when the penis is not erect. Circumcision is the removal of the foreskin, either partially or completely. It may be done for religious, aesthetic, health, hygiene reasons, or to treat disease. Between the normal foreskin and glans penis contrast will be entrapped creating an arrow-head appearance. The foreskin artifact is secondary to retraction of a tight foreskin and consequent narrowing of the distal urethra. This can mimic a distal urethral stricture. Reduction of the foreskin returns the urethra to normal. Phimosis may mimic meatal stenosis with narrowing of the urethral stream.
 
 
 
References
 
1. Kirks DR., Practical Pediatric Imaging.  Lippincott-Raven. 1998; pp1028.
 
2. eMedicine - Phimosis and Paraphimosis : Article by Santos Cantu, Jr., MD.