Torsion of hydatids

**Definition:** A condition of the testicular appendix, caused by determinants arising during the antenatal period. This condition is characterised by twisting of the hydatid of Morgagni and pedunculated hydatid around its axis and ischaemia, testicular pain, scrotal oedema, and a palpable blue dot discolouration on the scrotum. Confirmation is by imaging.