Phimosis is best described as which of the following?

Phimosis is characterized by a condition where the foreskin of the penis cannot be retracted over the glans, which corresponds to the description of a tight foreskin. This condition can occur in newborns and may resolve naturally as they grow older, but in some cases, it may persist into adulthood. Understanding this definition is important, especially in the context of pediatric and urological assessments.

The other definitions provided do not align with phimosis. For instance, the benign enlargement of the prostate is referred to as benign prostatic hyperplasia (BPH), and it pertains to an entirely different anatomical structure and condition affecting men, typically older adults. The absence of one or both testicles refers to a condition called anorchia or cryptorchidism, which is also unrelated to phimosis. Lastly, the urethral opening on the upper side of the penis is known as epispadias, a congenital condition that describes a malformation, completely distinct from the conditions related to the foreskin. Thus, the tight foreskin that cannot be retracted is the correct representation of phimosis.