Blue drum membrane sign

The blue eardrum is also called the black eardrum. The normal eardrum is an oval translucent film. If the drum chamber is filled with air, the eardrum appears pearly white. Once bloody contents accumulate in the tympanum, they can appear dark blue or blue-black through the tympanic membrane. Therefore, the blue tympanic membrane is merely a lesion of the tympanic cavity or the surrounding tympanic cavity, which is reflected in the change of the tympanic membrane color. Cholesterol granuloma, once necrotic and bleeding, can cause hemorrhage in the tympanic chamber, and the "blue tympanic membrane sign" appears. The shade of blue color depends on the amount of blood decomposition products in the permeate in the tissue. Blue tympanic membrane and cholesterol granuloma: Cholesterol is a type of lipid. Its important physiological functions in the human body include: 1. It is a component of the cell membrane. Cells absorb nutrients and discharge metabolic waste are controlled by the cell membrane. 2. It is a raw material for the synthesis of bile acids and vitamin D3. It can prevent rickets in children. 3. It is the raw material for the synthesis of steroid hormones, especially sex hormones and adrenocortical hormones. These hormones are indispensable for human health and human reproduction.