Ectopic calcification, also known as ectopic ossification, is the deposition of calcium salts outside of the skeletal tissue in addition to normal physiologic calcification. And what symptoms are ectopic calcification easily confused with? 1. Central calcification: Central chondrosarcoma may manifest as osteolysis with blurred borders, with or without cortical bone interruption. Due to the tendency of cartilage to calcify and ossify, an impermeable X-ray area may appear within the tumor, and calcification often occurs around the cartilage lobules without certain structure. It is characterized by irregular fog-like particles, nodules or rings that are impervious to X-rays. 2, pineal gland calcification: common in adults and more likely to occur with increasing age, about 75% of normal adults show pineal gland calcification on CT scan. Its diameter range is usually 3 to 5 mm, but sometimes it may be more extensive. If the pineal calcification is large and displaced and appears in a pediatric patient, the possibility of a tumor in the pineal region should be considered. 3, intrahepatic calcified foci: It refers to the appearance of strong echogenic or high-density images similar to stones in the liver on ultrasound or CT images. It is common in people aged 20 to 50 years old, with equal occurrence in both sexes, and is usually a single calcified foci, more in the right liver than the left, and rarely appears in both the left and right hepatic calcified foci. 4, pathological calcification: In addition to bone and teeth, the phenomenon of calcium salt deposition in other tissues of the body is called pathological calcification. The precipitated calcium salt is mainly calcium phosphate, followed by calcium carbonate. Pathological calcification can be divided into two types: dystrophic calcification and metastatic calcification. The former occurs mainly on the basis of local tissue degeneration and necrosis. The deposition of calcium and phosphorus ions in the blood is promoted by the altered physicochemical environment of the local tissues. The latter occurs on the basis of high blood calcium. When the concentration of calcium ions in the blood is elevated, calcium salts can be deposited in multiple healthy organs and tissues. The morphological manifestations of the two types of calcification are basically the same, but the mechanisms of their occurrence and their effects on the organism are different.