Grynfelt’s lumbar hernia, from the author who first described it in 1866, is the rarest among all hernias of the abdominal wall and it represents, in the treatment technique depends on the size of herniation, the dimension of hernia orifice, and the clinical condition when a patient is diagnosed. According to the most recent literature, only 2% of all hernias. Of these, about 20% are congenital, secondary mainly to defects of embryonic development, while 80% are acquired defects. Surgeries, penetrating wounds, and infections are risk factors for the development of secondary and therefore iatrogenic lumbar hernias. In the literature, there is a predominance of the left Grynfeltt hernia while a bilateral presentation is exceptional. We report a case of a superior lumbar triangle hernia in an 85-year-old male patient who was successfully operated on at Binh Dan Hospital. We performed an open surgery technique, brought the herniated organs into the abdominal cavity (with the herniated organs being the descending colon and the greater omentum without necrosis), identified and sutured the neck of the hernia sac, placed the mesh and fixed it to the anterior superior iliac spine and the lower border of the 12th rib. The patient recovered well after surgery and was discharged after 3 days. The patient was followed up after 1 year without recurrence or complications. DOI: 10.59715/pntjmp.3.2.27