Hypodense shadows in the liver are seen in many diseases, the most common being hemangiomas, which are developmental abnormalities. Many people have no symptoms, but can be found during a health checkup as huge hemangiomas, which can also compress neighboring organs or bile ducts, manifesting as abdominal pain, local elevation on examination, pressure pain, and even palpable throbbing sensation, requiring the timely choice of surgical treatment. In addition, there are congenital and acquired hepatic cysts, the congenital ones are caused by bile duct dilatation, while the acquired ones include trauma, inflammation, infection, parasites, and if necessary, surgery is also needed to remove the lesion. There are also malignant lesions occurring in the liver, including primary liver cancer and metastatic liver cancer, which manifest as low-density irregular occupying images, and enhanced CT examination can further confirm the diagnosis.