CT can show significant tympanic effusion. CT exams use X-rays with high density resolution, and the tympanic chamber usually refers to the cavity between the eardrum and the outer wall of the inner ear, and the density of the CT image will change when significant effusion is present. CT is actually the same principle as a regular X-ray chest X-ray, using X-rays, but CT is a tomographic imaging, the main advantage is its high density resolution, by measuring the CT value on the image can be clearly distinguish the effusion and other components. The tympanic cavity is part of the middle ear, a cavity between the eardrum and the outer wall of the inner ear. Its anterior Eustachian tube communicates with the nasopharynx, and its posterior tympanic sinus inlet communicates with the tympanic sinus and mastoid. When there is a significant accumulation of fluid in its cavity, a fluid-air plane can be seen. If the amount of fluid is small, a high-resolution thin-layer scan is needed to recognize it. Patients are advised to go to regular hospitals for relevant examination and treatment.