A newborn with congenital aplasia of the dorso-lumbar muscles is descr
ibed. The lesion seemed to be a congenital lumbar hernia and is a very
uncommon feature. The child underwent surgery and although it was a v
ery large bilateral defect, it was repaired without using prosthetic p
atch. The surgical technique and the results are discussed. The functi
on of the region was conserved as demonstrated at the check-up of the
child at 6 and 12 months of age.