Bardet-biedl syndrome in a child with chronic kidney disease

Area of Science:

• Pediatric Nephrology
• Clinical Genetics
• Urology

Background:

• Posterior urethral valve (PUV) is a congenital anomaly causing bladder outlet obstruction and potential renal damage.
• Bardet-Biedl syndrome (BBS) is a rare genetic disorder characterized by obesity, retinal dystrophy, polydactyly, and cognitive impairment.
• Early diagnosis and management are crucial for improving outcomes in children with complex congenital conditions.

Observation:

• A 4-year-old boy presented with renal failure, urinary tract infections, polyuria, polydipsia, enuresis, short stature, and obesity.
• Investigations revealed elevated BUN and creatinine, Pseudomonas aeruginosa in urine culture, and bilateral small kidneys on ultrasound.
• The patient had a history of mild-to-moderate mental retardation and postaxial polydactyly.

Findings:

• The constellation of symptoms, including mental retardation, obesity, postaxial polydactyly, and bilateral renal hypoplasia, strongly suggested Bardet-Biedl syndrome (BBS).
• The co-occurrence of posterior urethral valve (PUV) and BBS was identified as a rare etiological factor for the patient's early-onset renal failure and obesity.
• This rare combination presented a diagnostic challenge, necessitating a comprehensive evaluation of genetic and urological factors.

Implications:

• This case underscores the importance of considering rare genetic syndromes like BBS in pediatric patients with unexplained renal failure and obesity.
• Recognizing the co-occurrence of PUV and BBS is critical for timely and appropriate management, potentially altering treatment strategies and prognosis.
• Further research into the interplay between genetic syndromes and congenital urological anomalies can improve diagnostic pathways and patient care.