priapism is a topic covered in the Taber's Medical Dictionary.

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(prī′ă-pizm )

Abnormal, painful, and continued erection of the penis caused by disease, occurring usually without sexual desire.
SEE: erection

It may be due to lesions of the spinal cord above the lumbar region or to peripheral sensory irritants. It is sometimes seen in patients as a complication of sickle cell disease or leukemia. Some medications used to promote penile erection cause priapism as an unwanted, adverse effect.

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