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What is the classic presenting symptom and patient age for this condition?
Projectile non-bilious vomiting in infants 1 - 2 months of age.
The thickness of the pyloric muscle measures 4mm, and the pylorus measures 20mm in length in this case. What is a normal measurment?
Less than 3mm transverse thickness of pylorus muscle, and less than 15mm in length.
Ultrasound of the pylorus demonstrates 4mm thick pyloric muscle and increased length of the pyloric canal to 20mm. The thickened muscle forms a prominent hypoechoic target sign on transverse (sagittal with respect to the trunk) imaging . Also note the protrusion of pyloric mucosa in to the antrum.