Tough to give any more information if you've already seen three urologists.
You may want to be evaluated for any anatomical causes of priapism, including both
venousDeep venous thrombosis
Deep venous thrombosis, iliofemoral
Intravenous
Intravenous pyelogram
Intravenous pyelogram (ivp)
Pulmonary arteriovenous fistula
Pulmonary embolus
Stasis dermatitis and ulcers
Varicose vein therapy
Venous blood clot
Venous insufficiency and
arterialArterial embolism
Arterial insufficiency causes. A blood count and coagulation studies can be considered to evaluate for any bleeding disorders or leukemia that can uncommonly lead to this symptom.
Imaging studies such as an ultrasound or even an arteriogram can be considered to look at the vasculature.
These options can be considered with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b