<s>[INST] What is the best treatment for synovial cysts and popleteal cysts in knee joints of  children who do not have any form of arthritis and who cannot tolerate anti- inflamatory drugs? Is it advisable to aspirate the cyst if acute pain persists for 15 months? [/INST] Hi.Thanks for your query and an elucidate history.Simply aspirating the cysts will not solve the problem, as it will re-accumulate. Give it a try for once only, if the problems persists you have to go for a formal surgery. This  will also give material for histo-pathological diagnosis to determine the exact cause of this problem in such a small child. </s>