Brain, Neck & Spine

Ranula

A ranula is a fluid-filled cyst that develops under the tongue when salivary glands become blocked or damaged. This condition appears on radiology reports as a well-defined, fluid-containing structure in…

Thecal Sac

The thecal sac is a membrane-filled tube that surrounds your spinal cord and contains cerebrospinal fluid. When radiologists mention the thecal sac in imaging reports, they are describing this protective…