Idiopathic Hypertrophic Pyloric Stenosis

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Pathology Research International
Volume 2010, Article ID 614280, 4 pages
doi:10.4061/2010/614280

Case Report
Idiopathic Hypertrophic Pyloric Stenosis in an Adult,
a Potential Mimic of Gastric Carcinoma
Alireza Zarineh,1 Marino E. Leon,2 Reda S. Saad,3 and Jan F. Silverman1
1 Department

of Pathology and Laboratory Medicine, Allegheny General Hospital/Drexel University College of Medicine,
320 East North Avenue, Pittsburgh, PA 15212, USA
2 Department of Pathology and Laboratory Medicine, Ohio State University Medical Center,
S-305 Rhodes Hall 450 W. 10th Avenue, Columbus, OH 43310-1228, USA
3 Department of Pathology and Laboratory Medicine, Sunnybrook Health Sciences Centre,
University of Toronto, 2075 Bayview Ave, Toronto, ON, Canada M5N 4M3
Correspondence should be addressed to Alireza Zarineh, [email protected]
Received 24 May 2009; Accepted 24 July 2009
Academic Editor: Pablo A. Bejarano
Primary or idiopathic hypertrophy of the pyloric muscle (IHPM) is a rare entity with uncertain pathogenesis which both clinically
and pathologically mimics gastric cancer. We present a rare late-occurring case of IHPM in a 71-year-old Caucasian man with no
apparent predisposing factor. Imaging studies demonstrated gastric distension with air fluid levels and no evidence of extrinsic
compression. At upper endoscopy, massive gastric distension and no evidence of any ulcer or other mucosal defects were observed.
Microscopically, marked hypertrophy of muscularis mucosa with smooth muscle cells arranged in whorls and fascicles was present
which gradually transitioned to normal areas. The muscle fibers stained with smooth muscle actin and trichrome stain highlighted
fibrosis between the muscle fibers. Although uncommon, IHPM can clinically and histologically mimic other proliferations in
the gastric wall, such as gastrointestinal stromal tumor or a spindle cell neoplasm. The recent advances in understanding the
pathogenesis of IHPM are discussed.
Copyright © 2010 Alireza Zarineh et al. This is an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly
cited.

1. Introduction

2. Report of a Case

Primary or idiopathic hypertrophy of the pyloric muscle
(IHPM) in adults is a relatively rare, yet well-established
entity [1, 2]. The incidence of congenital hypertrophic
pyloric stenosis is reported between 0.25% and 0.5% of all
live births in literature [3, 4]. The adult variant, however,
is even more uncommon with less than 200 cases reported
in the English literature [5]. Although, it is unclear what
causes this condition, theories have been proposed such as
the persistence of a mild manifestation of a juvenile form into
adulthood [2, 6]. IHPM appears to be far more common in
middle aged males [7, 8].
We report a case in an older male with no prior history
of gastrointestinal symptoms and no apparent precipitating
factor.

A 71-year-old Caucasian man had been experiencing abdominal distension, nausea, and vomiting for three months.
His symptoms worsened progressively over the previous
two weeks when he was referred to our institution for
further evaluation. The abdominal distention and vomiting
appeared to be mostly postprandial, and the vomitus consisted of mainly undigested food and no bile. His symptoms
were independent of the type and consistency of the type of
the food ingested. His past medical history was significant for
cardiovascular diseases, end stage renal disease, and diabetes
mellitus with no history of gastrointestinal problems.
Abdominal films obtained before admission showed
massive gastric distension. Physical exam revealed a soft,
mildly distended abdomen. No tenderness, mass, and/or

2

Pathology Research International

(a)

(b)

(c)

(d)

Figure 1: (a) Esophagogastroscopy (EGD) of the pyloric canal showing marked narrowing and failure to relax after dilatation. (b) Full
mount of the pyloric region cross section demonstrating marked thickening of the muscularis propria layer (scanning magnification). (c)
High magnification showing fascicles of smooth muscles with a disorderly stratification (high power). (d) Immunhistochemical stain for
smooth muscle actin antibody confirms the presence of layers of smooth muscles (high magnification).

hernia were discovered. The remainder of the examination
was unremarkable except for his dialysis fistula in right
upper extremity. He was admitted with diagnosis of gastric
outlet obstruction. Abdominal films following admission
again demonstrated gastric distension with air fluid levels. A CT scan did not show any evidence of extrinsic
compression.
An upper endoscopy (EGD) demonstrated massive gastric distension with a large collection of partly digested food.
There was no evidence of an ulcer or other mucosal defect
in the pyloric channel, but the channel did not appear to
relax and dilate (Figure 1(a)). The endoscope passed the
channel with slight resistance, which was interpreted as
pyloric stenosis. The duodenum was unremarkable.
The patient did not improve, and surgical exploration
was recommended. At exploratory laparotomy, a massively
dilated stomach was encountered. During this procedure,
a minigastrotomy was made on the greater curvature of
the stomach, and greater than 3 liters of foul-smelling

particulate matter gastric contents were removed, consistent with longstanding food retention. The origin of this
retention appeared to be due to pyloric stenosis with an
associated thickened gastric wall. An antrectomy with Rouxen-Y gastrojejunostomy was performed, and a Witzel feeding
jejunostomy tube was placed.

3. Pathologic Features
The specimen consisted of a segment of stomach, antrum
and pylorus measuring 9 × 6 × 4 cm. The wall of the stomach
was uniformly thickened over the proximal portion of the
specimen involving the entire circumference of the gastric
wall. A very prominent gastric fold measuring 1.5 cm in
thickness and located at 1 cm from the distal margin was
observed at the pylorus. There were focal areas of congestion
in the mucosa, but no masses or ulcerations were seen.
Microscopically, marked muscularis propria hypertrophy
with smooth muscle cells arranged in whorls and fascicles

Pathology Research International
were seen in the pylorus, while the remaining stomach also
showed a thickened muscularis propria (Figures 1(b) and
1(c)). Transition between thickened and normal areas was
gradual. The maximum pylorus muscle thickness measured
at 1.3 cm. There were also focal mucosal changes consistent
with reactive (chemical) gastropathy and a single hyperplastic polyp was present. Lymphoid aggregates consistent with
mild chronic gastritis were present in the gastric mucosa. No
evidence of diabetic gastropathy including hydropic neural
degeneration, vasculopathy, or smooth muscle degeneration
was present.
Immunohistochemistry staining for smooth muscle actin
(clone 1A4, Dako Cytomation, Carpenteria, CA; 1 : 150)
confirmed the thick layer of smooth muscle (Figure 1(d)).
Trichrome stain showed the presence of fibrosis between the
muscle fibers.

4. Discussion
Adult IHPM has been previously described in literature [1–
15]. Patients with adult hypertrophic pyloric stenosis often
have history of epigastric pain or vomiting with occasional
relief after vomiting [1].
Radiology examination can be normal in many cases
[9, 15], and endoscopy is often needed to make the diagnosis
of IHPS and exclude other causes. Schuster defined a unique
endoscopic sign called the “cervix sign” to describe the
narrowing of the pylorus [10]. This sign is consistent and
persists after anticholinergic therapy, and pressure by the
endoscope differentiates it from the far more common
pylorospasm [11].
Microscopic examination demonstrates marked hypertrophy of pylorus muscles which may be associated with
reactive mucosal gastropathy. However, no other significant
pathologic process such as inflammation or neoplasm should
be seen in the muscularis propria. The transition of the
hypertrophied section is usually gradual from the normal
areas [9, 12]. The presence of fibrosis in addition to smooth
muscle hypertrophy can often be present, as was seen in our
case.
The exact etiology of adult IHPM is unclear. The
most widely accepted etiologic classification includes a
primary type with no apparent underlying disease and
a secondary type. The secondary type can have many
causes including exuberant healing of a previous gastric or
duodenal ulcer, carcinoma, gastrointestinal stromal tumor,
extrinsic postoperative adhesions, bezoars, and vagal hyperactivity leading to muscular hypertrophy [4, 13, 14, 16].
The secondary type usually demonstrates a predominantly
localized replacement by fibrous tissue, with little or no
smooth muscle hypertrophy. Other rare reported causes are
postinflammatory complication in Crohn’s disease [17] and
mucosal diaphragm [18]. Stress ulceration at the pylorus
has been proposed as the cause of infantile hypertrophic
pyloric stenosis [19], although it does not seem to have a
role in the adult form. The only explanation proposed for
the primary type is the persistence of the juvenile form that
later presents in adult life [2, 6, 20]. However, considering

3
the age of onset of 30–60 years [7], it is unclear why the
majority of patients remain asymptomatic until middle age,
although it is speculated that it may be that the condition
is aggravated by other gastric pathology [4]. Finally, as with
infantile form, a familial tendency of occurrence has been
documented for adults with hypertrophic pyloric stenosis
[21], and both forms can occur in the same family. However,
some cases appear to arise de novo at a more advanced age
[2].
Differential diagnosis includes the more common neoplastic processes and diabetic gastropathy both can have the
similar clinical presentation. Though recognizing carcinoma
is often straightforward, the spindle cell neoplasms such
as gastrointestinal stromal tumor might be more difficult
to differentiate from IHPM. Diabetic gastropathy shows
the characteristic hydropic neural degeneration with severe
reduction in the density of unmyelinated axons, vasculopathy with thickening of the vessel walls, and smooth muscle
degeneration and fibrosis, with eosinophilic inclusion bodies
(M-bodies) which appear to be unique to this condition.
The preferred treatment is surgery with gastric resection
and Billroth I anastomosis [7], as was performed in our
patient. Although pyloroplasty and vagotomy have also been
performed with successful results [16], recurrence has been
reported with this approach [22].
We present this relative unusual presentation of gastric
outlet obstruction to raise the awareness of the existence of
this lesion and not confuse the histologic findings with other
proliferations in the gastric wall such as a gastrointestinal
stromal tumor or other spindle cell neoplasms. Attention
to the clinical and histologic features should allow a correct
interpretation and prevent misinterpretation of a neoplasm,
especially at the time of frozen section.

References
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Pathology Research International
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