You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Lighthouse sign is seen in ASOM in which stage and explain in detail?
Lighthouse sign: It means flowing out of discharge from the perforation in the tympanic membrane. The external auditory canal may obtain blood tinged discharge which later becomes mucopurulent. Usually, a small perforation is seen in anteroinferior quadrant of pars tensa. Hyperaemia of the tympanic membrane begins to subside with a return to normal colour and landmarks. (Ref: Textbook of diseases of ENT, PL Dhingra 7th edition, pg no. 68)