Focal epilepsy and Jacksonian epilepsy

Focal epilepsy noun - Epilepsy in which the attacks begins with an isolated disturbance of cerebral function (as a twitching of a limb or an illusory sensation or a mental disturbance).

Jacksonian epilepsy and focal epilepsy are semantically related. In some cases you can replace phrase "Jacksonian epilepsy" with "Focal epilepsy", this phrases are similar.

Jacksonian epilepsy noun - Focal epilepsy in which the attack usually moves from distal to proximal limb muscles on the same side of the body.

Focal epilepsy and Jacksonian epilepsy are semantically related. You can use "Focal epilepsy" instead a noun phrase "Jacksonian epilepsy".