Crossed Fused Renal Ectopia

Crossed Fused Renal Ectopia

Anwen has recently been diagnosed with Crossed Fused Renal Ectopia.  She has 2 kidneys on her right side but none on her left side.  We’ve been aware of a potential kidney problem for a while.

During my pregnancy the ultrasound technicians were unable to view Anwen‘s kidneys.  They weren’t overly concerned at the time.   The bladder could be seen, it was filling normally and the amniotic fluid was of normal levels. After the third ultrasound they decided to call it quits and arrange a renal ultrasound to be carried out after birth.

We attended this appointment a few weeks ago.  During the ultrasound, a long time was spent trying to decipher what is going on with Little Miss Anwen’s kidneys.  The conclusion is a diagnosis of Crossed Fused Renal Ectopia.  

What is Crossed Fused Renal Ectopia (CFRE)?

To put is simply, her left kidney has crossed over to the right side of her body and fused with the right kidney.  

Sometime during the first few weeks of development in the womb, the buds that later become kidneys have formed in the pelvic region and fused together.  It is a congenital defect (present at birth) and it’s incidence is estimated to be 1 in 1000 births.  Rare, but not the rarest of the rare. 

The space the left kidney is supposed to occupy is empty with no renal tissue visible.  Anwen’s kidneys are similar in size and are fused at their poles although I’m not certain if it is a Inferior Ectopia (a in the image below) or Superior Ectopie (f in the same image).  I’m sure I will be given this information at her next appointment. 

I know very little about CFRE at the moment, except what I’ve found from medical journals and websites. From what I can gather though, it may not ever cause her any problems.  We are to keep an eye on her in case of UTI’s and Kidney Infections. 

I’m hoping Anwen will be among the lucky ones who would never even have known if it wasn’t for the advance of ultrasound technology.