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Objective: The aim of this research was to evaluate the incidence rate of retrorenal colon in Thai patients and the risk factors for retrorenal colon.
Material and method: This research was an observational study .Data used therein was collected from the review of CT whole abdomen performed to patients from Rajavithi hospital with age of 15 years or older, from 1 March 2016 – 31 December 2016.
Result: The total number of patients undergoing CT scan reviews was 1,010 (male/female= 49.2%/ 50.8%)Retrorenal colon were found in 73 patients(7.23%) ,including 32 patients (3.16%) on the right side, 50 patients (4.95%) on the left side, and 9 patients (0.89%) on both side. Retrorenal colons were found more on the left side than on the right side (5.0% v.s. 3.2%,p=0.04). Age had no impact on retrorenal colon . BMI had statistically significant impact (p<0.01) on retrorenal colon incidence, 33.8% in patients with underweight (BMI<18.5), 13.4% in patients with normal weight (BMI18.5-22.9), 0.9% in patients with overweight (BMI23-24.9), and 0.26% in patients with obesity (BMI>25).
Conclusion: CT scanning before PCNL in order to diagnose retrorenal colon is advantage to persons with low BMI, especially when accessing at the lower pole of the kidney is needed.
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