"In early childhood, the pelvis is relatively small and shallow, and the bladder sits higher in the abdomen than in adults. During bladder filling, especially when distended, the bladder wall may temporarily extend laterally, beyond the expected confines of the pelvis."
"Bladder ears can often be seen in young children during routine imaging studies, including voiding cystourethrogram, ultrasound, CT and MRI and have the following appearance 1-3:"
"History and etymology"