A secondary hydrocoele is most frequently associated with acute or chronic epididymo-orchitis. It is also seen with torsion of the testis and with some testicular tumours. A secondary hydrocoele is usually lax and is typically small: the underlying testis is usually palpable. If a tumour is sus- pected, the hydrocoele should not be punctured for fear of needle-track implantation of malignant cells. A secondary hydrocoele subsides when the primary lesion resolves