NMTCB Computed Tomography (CT) Board Practice Exam

An intrathecal injection of contrast specifically targets the subarachnoid space, which is located within the meninges surrounding the central nervous system. Unlike other spaces, the subarachnoid space is filled with cerebrospinal fluid (CSF) and provides a pathway for the contrast to communicate effectively with the structures of the brain and spinal cord. This technique is often utilized during certain diagnostic procedures, such as myelography, to enhance the visibility of the spinal cord and nerve roots on imaging studies.

In delivering contrast directly into the subarachnoid space, clinicians can better evaluate conditions that may affect the central nervous system, such as tumors, cysts, or inflammation. The use of intrathecal contrast allows for improved diagnostic accuracy compared to traditional methods that involve different compartments or spaces.