Sonographic Features of Hypertrophic Pyloric Stenosis
1Radiology department, French Medical Institute for Children (FMIC), Kabul, Afghanistan.
Corresponding Author:Hidayatullah Hamidi, Radiology department, French Medical Institute for Children (FMIC), Kabul, Afghanistan, Tel: 0093744733605; E-Mail:Hidayatullah.email@example.com
- Received Date: 18 Feb 2016 Accepted Date: 31 Mar 2016 Published Date: 13 Apr 2016
- Copyright © 2016 Hamidi H
Citation: Hamidi H. (2016). I Sonographic Features of Hypertrophic Pyloric Stenosis. M J Case. 1(1): 003.
A three month old boy that weighs 4 Kg has persistent vomiting
for last two months.
Trans-abdominal sonography with high frequency linear probe shows the abnormally thick walled, peripherally hypo-echoic and centrally hyper-echoic tubular structure just inferior to the gall bladder which is proximally continued to the dilated stomach.
The length of this abnormal segment is 24 mm with a wall thickness of 8 mm.
Figure 1:Trans-abdominal ultrasound with high frequency linear probe: Abnormally thick walled, peripherally hypo-echoic and centrally hyperechoic tubular structure just inferior to the gall bladder (GB) proximally continued to the dilated stomach.
Hypertrophic pyloric stenosis (HPS) is the thickening of the
muscular layer of antropyloric canal with resultant failure to
relax and subsequent gastric outlet obstruction. Elongation of
the canal and thickened mucosa are also seen . The incidence
is 3 per 1000 live births per year; however variations
are present with geographic location, season and ethnic origin
Typically infants are clinically normal at birth but during the first few weeks of life, they develop non-bilious projectile vomiting . Diagnosis is suggested by typical clinical presentation .
Palpation of the hard muscle mass or olive is diagnostic with detection rate of 85%–100% in experienced hands and with adequate time and preparation but it is often challenging and time consuming [3, 4].
Accurate clinical diagnosis in patients in whom a thickened antropyloric muscle is not readily palpable can be difficult, resulting in delayed diagnosis .
Ultrasound (US) is the preferred diagnostic modality especially when performed with high frequency linear probe by experienced hands .
It is a non-invasive and radiation free technique. The typical sonographic feature is increased thickness of the muscular layer. An abnormal cut off value of 3 mm in thickness has been described in the literature .
The other criterion is the llength of the pyloric canal greater than 12 mm in length .
In conclusion; infants with persistent, non-bilious vomiting that are clinically suspected for infantile hypertrophic pyloric stenosis can be evaluated by trans-abdominal (multi frequency linear transducer) sonography as a noninvasive, radiation free imaging modality. When thickened pyloric muscular layer of 3 mm or more in thickness and greater than 12 mm in length is noted, the diagnosis of hypertrophic pyloric stenosis can be made with great accuracy.