👉 The Brunswick fluid, also known as Brunswick's exudate, is a serous fluid that accumulates in the lumen of the bile ducts, particularly the common hepatic duct, following bile duct obstruction or inflammation. It is composed primarily of water, proteins, and mucins, with a lower concentration of bile acids compared to normal bile. This fluid can be detected in the bloodstream or collected during a fine-needle aspiration biopsy of the bile ducts, serving as an indicator of bile duct pathology and aiding in the diagnosis of conditions like cholangitis, bile duct stones, or tumors.
