“…The third step is the use of radiological instruments. The most commonly employed radiological tools both to diagnose parietal complications of HD and determine the location of lesions are as follows: US, [7,17–19] CT, [27–38] MRI, [25,42] and fistulography. [3,11,16,26,48,50,52] Fistulography may be help in determining the length of a fistula's internal orifice, the size and location of fistulized lesion, and the relationship of a fistula with bile ducts, bronchopleural structures, and pelvicalyceal system.…”