(From blood, and a tumour). A species of false hernia in the scrotum, consisting of a collection of blood in the tunica vaginalis. It resembles, in appearance, an hydrocele, and the method of cure is the same. It most commonly follows hydrocele, and is occasioned by a puncture of the instrument, or sometimes by a natural haemorrhage, in consequence of the support taken from the vessels by a discharge of the water. Blood in the tunica vaginalis is distinguished from water by its colour and weight. The tumour may be sometimes discussed by stimulant and astringent lotions; but the operation is generally necessary. If any vessel appears to discharge blood, and the application of alcohol, tincture of myrrh, or ether, applied by means of pledgets of soft lint, do not check the bleeding, the ligature must be employed. See Celsus; P. AEgineta; Bell's Surgery . vol. i. p. 482; Pott's Works, 4to. 1775; White's Surgery, p. 342. Haematocfle arteriosum. See Aneurisma. Haematochysis, (from blood, and to pour out). See Haemorrhagia.