blue dot sign

blue dot sign

a blue or black spot visible beneath the skin on the cranial aspect of testis or epididymis. This is a torsed testicular appendage and is usually quite tender.
The appearance of a small dark blue spot on transillumination in patients with torsion of the testicular appendage or epididymis, accompanied by intense pain at or near the head of the epididymis or testis, and an isolated tender palpable nodule
References in periodicals archive ?
For example, torsion of the appendix testes may not have the classic blue dot sign in every case, making it difficult to distinguish the two.