Hematocoele is a medical term that refers to the accumulation of blood within a body cavity, such as the scrotum or the peritoneum. This condition is often associated with trauma, inflammation, or infection, and may cause pain, swelling, and other symptoms. Synonyms for hematocoele include haematoma, blood cyst, blood clot, and blood-filled sac. Other terms that may be used to describe similar conditions include seroma, lymphocele, and hydrocoele. These synonyms may be useful in medical communication when discussing diagnoses, treatments, or research related to blood-filled cavities in the body.