Final answer:
The Girdle Vessel (dai mai) is the appropriate Extraordinary Vessel to be selected for treatment of back pain radiating towards the front lower abdomen and severe pain above the iliac crest, based on the described symptoms.
Step-by-step explanation:
The Extraordinary Vessel best suited for treatment according to the symptoms described - back pain on the left lateral side radiating toward the front lower abdomen and severe pain above the iliac crest - is the Girdle Vessel (dai mai). This is because the dai mai encircles the waist and is involved in disorders that manifest around the belt pathway, which includes lateral side of the back and the abdomen.
The dai mai is traditionally selected when there is a need to harmonize the upper and lower parts of the body and when the pathology shows a horizontal distribution, which is indicated by the radiating pain of the patient. The precise selection of this vessel over others, such as the Governing Vessel or the Yang Linking Vessel, is based on the specific symptoms of lateral and radiating pain as well as the location mentioned, which coincides with the pathway of the dai mai.The Girdle Vessel (dai mai) is connected to the lower back and helps to regulate the flow of energy in the lower abdomen and pelvis. It is particularly effective for treating pain and discomfort in these areas, which matches the symptoms described by the patient.
In Traditional Chinese Medicine, the Girdle Vessel is also believed to help tonify the Kidney and strengthen the lower back. By treating the Girdle Vessel, it can help alleviate the back pain that radiates to the front of the lower abdomen, reducing the severity of the pain just above the iliac crest.