The indications for penile angiography include the evaluation of impotence and trauma. The least common cause is which of the following?

The least common cause of impotence that would be evaluated through penile angiography is vasculogenic. While vasculogenic causes, such as arterial insufficiency due to vascular disease, are certainly significant and often discussed, they are more prevalent compared to neurologic, endocrine, or pharmacologic factors.

Neurologic factors refer to conditions affecting the nervous system that can lead to impotence, such as spinal cord injuries or neuropathies. These are recognized as a common cause because the nervous system plays a crucial role in sexual arousal and achieving an erection.

Endocrine causes are linked to hormonal imbalances, such as low testosterone levels or other hormonal disorders, which can significantly impact sexual function and thus are also relatively common in the context of impotence.

Pharmacologic factors pertain to medications that may lead to erectile dysfunction as a side effect, a scenario that is widely acknowledged due to the extensive list of drugs that can affect sexual function, with many individuals experiencing this as a common issue.

In contrast, vasculogenic impotence, while important and often treated through angiography, tends to be less frequent when considering all these potential causes. Hence, vasculogenic factors may not represent the most common referral indication for this imaging study, making it the least common