Objective: Retrospective study to determine the number of patient with hernial disc in a traverse anatomical cut of the spine, the localization of them and also It Making emphasis in the cases with extraforaminal lumbar disc or call far lateral disc herniation.

Patient and methods: 159 patients were identified during the period of the years 2002 at the 2005 that were operated of lumbar discectomy, we presented hernial disc, The localizations committed was L4-L5 and L5-S1 and a small group in L3. We review the record of the patients with hernial disc extra foraminal and all patients were diagnosed them for study of magnetic resonance image, to determine the clinical square. The surgical technique is described.

Results: Five patients presented hernial disc extra foraminal, one patient presented foraminal and extra foraminal disc herniation, four of them were male and two women. In all them the pain symptom prevailed to level of the knee and anterolateral of the thigh in its half third under the knee, in two of the patients, the rehabilitation treatment was required to present deficit motor for the extension of the leg. 

Conclusions: 3,77% of the patients presented extra foraminal disc and the presence of them should be suspected when the clinical square is of the lumbar high levels and the images of Resonance or CT scan are not conclusive for posterolateral disc herniation, in these cases it can be defined with CT scan with discography.