Hepatic hemangioma 21mm*19mm is less dangerous, but need regular review. Hepatic hemangioma is a mass-like structure formed by malformation of blood vessels in the liver, which is a benign tumor, most of them grow slowly without malignant tendency, and spontaneous rupture is relatively rare. Hepatic hemangioma measuring 21mm*19mm is less dangerous and usually does not need special treatment, but should be reviewed regularly, if the growth trend of hemangioma is obvious, produces obvious clinical symptoms or the diameter is larger than 10cm, it needs to be actively treated. Those who are found to have hepatic hemangiomas should consult the Department of Hepatobiliary Surgery in a timely manner, so that a specialist can assess the risk and advise on the next step of management. Follow-up observers should be aware of any abdominal distension or abdominal pain, and should seek medical attention immediately.