Calcification of the cerebral sickle is a diagnostic imaging description commonly used in the description of cranial CT diagnosis.1. Cranial CT is used to distinguish different tissues with different densities, for example, brain tissue is gray-black and slightly low-density or called isodensity, cerebrospinal fluid is black with very low density, skull is white with very high density, and the density of the cerebral sickle is below the skull and above the brain tissue. If there is an obvious high-density shadow on the cerebral sickle, consider that the cerebral sickle has calcification foci, because the main component of bone is calcium, and when calcium is deposited abnormally in the brain, there will be dotted or lamellar calcification foci.2. The cerebral sickle is a relatively common site of calcification, and the choroidal vascular plexus, pallidum, and pineal gland can also have similar calcifications, all of which are physiological calcifications and generally do not require special treatment.