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Erschienen in:
20.11.2017 | Classics in Abdominal Radiology
The “Bladder ear”
Erschienen in: Abdominal Radiology | Ausgabe 8/2018
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Bladder ear refers to unilateral (Fig. 1A) or bilateral (Fig. 1B) transient (Fig. 1C) protrusion of the urinary bladder into one or both inguinal rings, which is a normal physiological finding in infants as seen on retrograde intravenous urography or cystography (Fig. 2). While the phenomenon of bladder herniation has been known in the medical literature as far back as the twelfth century when described by Abulcasis [1], the term “Bladder ear” was initially coined by Dr. Allen and Dr. Condon in 1961 [2].
Fig. 1
Serial fluoroscopic bladder images of a 2-month-old male during filling portion of a voiding cystourethrogram study. During initial filling, bilateral bladder ears can be seen on an AP projection (arrows in A). With increased bladder distention, only a unilateral bladder ear is seen on an oblique projection (arrow in B). With complete bladder filling, neither bladder ear is seen (C), illustrating transient nature of this phenomenon
Fig. 2
Bilateral bladder ears on fluoroscopic cystography in a 3-month-old patient A. Superimposed cartoon depicting ear portions of bilateral bladder ears B. Cartoon drawn by author, Sergey Leshchinskiy, MD
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