Narrowings and the "McDonald Jet Sign"
The so-called ''jet sign" was first brought to my attention in 1981 by the late Dr. McDonald as a diagnostic sign of urethral stricture. It is a jet of dye starting at the stricture and spraying into the bladder. It was observed on roentgenograms following retrograde urethrography. Some characteristic roentgenograms have already been published with a short clinical description. It is befitting, now that Dr. McDonald has passed away, to name the jet sign after him, and henceforth call it the "McDonald jet sign."
More recently we saw the "McDonald jet sign" on retrograde pyelograms in patients who had uretero-pelvic junction obstruction. The jet sign seems to be much more frequent than had been suspected and can be seen in several conditions where the contrast material is injected across a narrowed passage, as it sometimes happens in urograms with a narrowed ureteral orifice.
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