| Intrathecal | <anatomy> Within a sheath, for example, cerebrospinal fluid that is contained within the dura mater. It also refers to drugs administered into the cerebrospinal fluid bathing the spinal cord and brain. (30 Sep 1997) |
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| intrathecal chemotherapy | Treatment with drugs that are injected into the fluid surrounding the brain and spinal cort (cerebrospinal fluid). (12 Dec 1998) |
| intrathecal injection | Injection of drugs into the spinal fluid to prevent or treat CNS leukaemia or lymphoma. (13 Nov 1997) |