🎤 How to Present This Case

Slide-by-Slide Script

Slide 1 — Title

"Good morning/afternoon everyone. The case I'm presenting today is titled 'An Unfinished Axis' — and this title is a deliberate metaphor. The caudal axis of the spine simply did not form completely in this child. The case involves Caudal Regression Syndrome presenting primarily as neurogenic bladder, which is an under-recognized urological emergency in pediatric practice."

Slide 2 — Introduction

"Caudal Regression Syndrome, or CRS, is a rare congenital vertebral anomaly characterized by varying degrees of agenesis or dysgenesis of the caudal vertebral column, often combined with spinal cord malformations. Its incidence is estimated at 1 to 2.5 per 100,000 live births. Importantly, it exists on a spectrum — severe forms are identified in utero or at birth, while milder forms can remain undetected until childhood or even adulthood. A notable feature is its strong association with renal and genitourinary malformations, which brings us directly to our patient."

Slide 3 — Presenting Complaints

"Our patient is a 10-year-old male who presented to the Pediatric Surgery department with continuous dribbling of urine, soiling of undergarments, and a lifelong history of lack of bladder control. On further questioning, he also reported constipation. These are classical red-flag symptoms of a neurogenic lower urinary tract dysfunction."

Slide 4 — History of Presenting Illness

"The dribbling and bladder incontinence had been present since birth — this chronicity is crucial. The absence of any neurological symptoms, traumatic injury, or drug history makes this a purely congenital etiology. No family history was elicited. Notably, there was NO history of maternal diabetes, which is classically the strongest risk factor — making this a spontaneous case, which we'll revisit in the discussion."

Slide 5 — Differential Diagnosis

"Before investigations, the three main differentials for neurogenic bladder due to a neural tube defect in a child were: Caudal Regression Syndrome, Currarino Syndrome — which is a triad of sacral agenesis, presacral mass, and anorectal malformation — and Tethered Cord Syndrome. Our investigations subsequently narrowed this down."

Slide 6 — Clinical Findings

"The child was conscious, cooperative, and active with stable vitals and normal higher mental function. However, there were subtle signs: a gait abnormality, continuous dribbling, and importantly, flattened buttocks — a classical physical sign of sacral agenesis where the absent sacrum gives the buttocks a characteristic flat appearance. On examination, an incomplete sacrum was palpable and the coccyx was absent. There was no gross motor deficit in the limbs."

Slide 7 — Investigations (MRI)

"MRI of the spine was the pivotal investigation. It revealed absence of the sacrum beyond S3, absence of the coccyx, and blunting of the conus medullaris at T10–T11 — significantly higher than the normal level of L1–L2. This high, abrupt conus termination is the hallmark imaging feature of Type I CRS. The MRI also showed an overdistended urinary bladder with diverticuli, and bilateral gross hydroureteronephrosis — indicating a chronically obstructed, high-pressure system with upper tract involvement."

Slides 9–10 — USG and MCU

"Ultrasound confirmed the dilated upper tracts. Micturition cystourethrogram showed an elongated bladder with an open bladder neck — indicating sphincter incompetence and failure of normal voiding coordination."

Slide 11 — Urodynamics

"Urodynamic studies are the gold standard for characterizing neurogenic bladder. In this case, they demonstrated a small capacity, high-pressure bladder with poor compliance. This is the most dangerous pattern because persistently elevated intravesical pressure causes progressive renal damage through vesicoureteral reflux — which was confirmed by the next investigation."

Slide 12 — DMSA and Blood Tests

"DMSA scan showed reduced function of the left kidney with bilateral renal scars — evidence that the bladder dysfunction had already caused renal injury. Elevated serum creatinine confirmed chronic kidney disease as a complication. This underscores why early diagnosis is critical."

Slide 13 — Provisional Diagnosis

"Based on the clinical picture and investigations, the provisional diagnosis was: Neurogenic bladder due to Caudal Regression Syndrome."

Slide 14–16 — Management and Treatment Plan

"Immediate management was started with oxybutynin — an anticholinergic to relax the detrusor and reduce bladder pressure — combined with Clean Intermittent Catheterization, which is the cornerstone of neurogenic bladder management. Night drainage was added. A bowel management programme was initiated for constipation. Cystoscopy is planned for further evaluation.

The definitive surgical plan addresses the whole urinary tract:

• Bladder augmentation — to increase capacity and reduce pressure
• Bilateral ureteric reimplantation — to correct reflux
• Bladder neck repair — to improve continence
• Appendicular Mitrofanoff procedure — to create a continent catheterizable channel
• Malone Antegrade Continence Enema (MACE) — for bowel management"

Slides 17–22 — Discussion & Conclusion

"In the discussion, I want to highlight three key learning points:

First — Classification: Renshaw's classification divides CRS into 4 types. Type I involves agenesis of the sacrum ± coccyx. Type II involves absence below a normal first sacral vertebra. Type III extends to lower lumbar vertebrae. Type IV involves complete lumbar and sacral agenesis. Our patient fits Type I based on MRI findings.

Second — Pathogenesis without maternal diabetes: While maternal hyperglycemia is the strongest known risk factor, appearing in 1 in 350 diabetic mothers versus 1 in 80,000 non-diabetic mothers, this case had no maternal diabetes. Other implicated factors include chromosomal/genetic causes, maternal drug exposure, and association with Currarino syndrome via MNX1 gene deletions. The exact mechanism is thought to involve notochordal apoptosis at a critical window of development.

Third — The silent danger of neurogenic bladder in CRS: Many children with mild CRS have no external morphologic abnormalities. The neurogenic bladder only becomes apparent when toilet training fails. By that time, renal damage may already be present. This case perfectly illustrates that delayed diagnosis results in bilateral renal scarring and elevated creatinine.

Conclusion: MRI spine is essential for diagnosis. Urodynamics are the gold standard for bladder characterization. CIC with anticholinergics is the mainstay of management. And surgical reconstruction — bladder augmentation plus Mitrofanoff — aims to achieve a low-pressure, continent urinary reservoir to protect the kidneys long-term."

❓ Anticipated Questions & How to Answer Them

Q1: What is the Renshaw classification?

• Type I: Total sacral and coccygeal agenesis (your patient — most severe, Type I)
• Type II: Partial sacral agenesis, stable last vertebra above the defect
• Type III: Variable lumbar and total sacral agenesis; iliac articulation to last vertebra
• Type IV: Variable lumbar and total sacral agenesis; iliac articulation to the side of the lowest vertebra present — "fused" ilia

Q2: Why is the conus medullaris high (at T10–T11)?

Q3: What is the difference between Type I and Type II CRS?

Q4: What is Currarino syndrome and how is it different?

Q5: How does CRS cause neurogenic bladder?

Q6: Why are urodynamic studies the "gold standard"?

Q7: What is the purpose of each surgical procedure planned?

Q8: Why was there no maternal diabetes in this case?

Q9: What other systems can be involved in CRS?

• Skeletal: Lower limb hypoplasia, hip dislocation, clubfeet, "Buddha position" sitting
• Gastrointestinal: Imperforate anus, anorectal malformations, constipation
• Genitourinary: Renal agenesis, horseshoe kidney, vesicoureteral reflux, cryptorchidism
• Cardiac: Ventricular septal defects
• These associations link it to the VACTERL spectrum and OEIS complex (omphalocele, exstrophy, imperforate anus, spinal defects)

Q10: What is oxybutynin doing here, and what are its alternatives?

Q11: Why CIC rather than an indwelling catheter?

Q12: What is the prognosis in CRS?

Q13: Any recent literature on CRS?

💡 Key "Wow Factor" Points to Mention

1. The title "An Unfinished Axis" — reference it at the start and close. It makes a strong impression.
2. Conus at T10–T11 — emphasize this is almost 3 vertebral levels above normal; it's not tethered, it's truncated.
3. Flattened buttocks as a clinical sign — shows you know the physical exam findings that often get missed.
4. No maternal diabetes — makes this case unique; spontaneous CRS.
5. The kidney is already damaged — brings home the message of why early recognition matters.

Left Image — Kidney (Renal Ultrasound)

• The kidney parenchyma (outer echogenic tissue) appears thinned in areas
• There is dilatation of the pelvicalyceal system — the central collecting system appears enlarged and fluid-filled (anechoic/dark areas within the kidney)
• The calipers are measuring the dilated renal pelvis — this is consistent with hydronephrosis
• The overall kidney architecture is distorted, suggesting chronic obstruction

Right Image — Urinary Bladder (Pelvic Ultrasound)

• A massively overdistended bladder — the large, smooth, anechoic (black/dark) rounded structure filling most of the image
• The bladder walls appear thickened in the upper portion — thickened detrusor wall from chronic high-pressure voiding dysfunction
• You can see what appears to be a diverticulum or irregular wall contour at the upper aspect of the bladder (the echogenic structure projecting into or adjacent to the bladder lumen)
• The sheer size of the bladder in a 10-year-old child is abnormally large, indicating chronic urinary retention

How to Present These Images

"On the left is a renal ultrasound showing a dilated pelvicalyceal system — evidence of hydronephrosis secondary to chronically elevated bladder pressure. On the right is the bladder in the same child — massively overdistended with a thickened, irregular wall and evidence of diverticuli formation. Together, these images demonstrate that the neurogenic bladder had already caused significant upper tract damage by the time of presentation — reinforcing why early diagnosis and prompt bladder pressure management are essential to preserve renal function."