Which condition is characterized by a biconvex lens shape on imaging?

The condition characterized by a biconvex lens shape on imaging is an epidural hematoma. This type of hematoma occurs when there is a collection of blood between the skull and the outer layer of the meninges (the dura mater). The biconvex shape is due to the pressure of the accumulating blood, which is confined to the area between the skull and the dura, causing a lens-shaped appearance on CT scans.

This shape is a distinguishing feature that helps in differentiating epidural hematomas from other types of intracranial hemorrhages, such as subdural hematomas, which typically have a crescent-shaped appearance due to the blood spreading more diffusely along the surface of the brain. Understanding this morphology is critical for accurate diagnosis and management of head injuries in clinical practice.