Penile disorders are a relatively uncommon presentation to the emergency department (ED); however, a few of these conditions are truly emergent. The penis is composed of 3 external anatomic parts—the shaft, glans, and foreskin. Penile disorders can be classified according to how these anatomic areas are affected. This chapter focuses on priapism, phimosis and paraphimosis, and balanoposthitis.
Priapism is a persistent, often times painful, erection in which both sides of the corpus cavernosa are engorged with blood. Priapism is subdivided into 2 classifications based on the source of blood—high flow versus low flow. Most commonly, oxygen-deprived, venous blood becomes entrapped in the cavernosa; this is termed “low-flow” priapism, or ischemic priapism. “High-flow” priapism, less often seen, results from a communication or fistula between the cavernosal arterial supply and the cavernosa itself. Because of the oxygen-rich arterial supply, this type of priapism is also called nonischemic priapism. High-flow priapism presents less of a time-sensitive risk and is often nonpainful.
Phimosis and Paraphimosis
Phimosis is the inability to retract the foreskin proximally over the glans. Causes include infection, poor hygiene, and trauma, which lead to scarring and fibrosis of the foreskin and resultant loss of normal movement. This can infrequently lead to urinary retention owing to blockage of the urethral meatus. Phimosis may be normal in prepubertal males (physiologic phimosis). By age 4, 90% of foreskins are fully retractable. A foreskin that is not fully retractable by the end of puberty is considered pathologic phimosis.
Paraphimosis is the inability to return a retracted foreskin to its original, anatomic position. Paraphimosis results when the foreskin is not returned to its normal position overlying the glans penis. This commonly occurs as an iatrogenic complication, such as after an exam of the glans or Foley catheter placement in a debilitated patient. The retracted foreskin acts in a tourniquet manner, restricting venous outflow from the glans penis. This eventually leads to local swelling, inflammation, ischemia, and necrosis of the involved tissue, causing a urologic emergency.
Balanoposthitis is a combination of inflammation of the glans penis (balanitis) and inflammation of the foreskin (posthitis). This condition occurs most commonly in uncircumcised males as a result of poor hygiene, local/recurrent irritation, or infection (usually Candida, Gardnerella, or Streptococcus pyogenes species). Balanoposthitis may be the sole presenting symptom of diabetes mellitus.