The rare lumbar hernia (of Petit) occurs in the interval between the edges of the latissimus and external oblique. The bulge stretches lumbodorsal fascia and internal oblique layers.
References:
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8. Martin, RW: Screening for Fetal Abdominal Wall Defects, Obstetrics and Gynecology Clinics, 25 (3):518-525, 1998.