The aim of this paper is to report a case of ventriculoperitoneal (VP) shunt tube coming out through
the anus in a 6-year-old boy, who had undergone shunt revision surgery for the malfunctioning of
the peritoneal end 6 months back. Among the complications of VP shunt surgery, such unusual
migration of peritoneal end of the VP shunt is very rare. The possible factors responsible for this
complication, in our case, were abdominal adhesions and thin bowel wall in the children. Although
this complication has been previously reported, it remains an exceedingly rare case. Risk factors and
possible mechanisms of migration are discussed.
Introduction
Ventriculoperitoneal (VP) shunt placement
is one of the common procedures done
in neurosurgical practice. However, it
can have many serious complications. In
this study, we report a case of migrated
peritoneal end of VP shunt which silently
came out through the anus. Migration of
peritoneal end of the VP shunt into the
rectum, vagina, scrotum, abdominal wall,
and mediastinum are other known rare
complications. Risk factors and possible
mechanisms of migration are discussed.
Case Report
A 6-year-old boy presented to us with a
history of tube protruding per anus. He had
undergone VP shunt (Chhabra-slit-in-spring
silicone shunt) at the age of 4 years for
congenital hydrocephalus followed by shunt
revision 6 months back. After this revision
surgery, in the postoperative period, he had
mild abdominal pain and distension for
3 days which was settled with conservative
management. The child was discharged
on the postoperative day 10 with no
complaints.
Six months later, the child presented to
us with tube protruding through the anus.
There was no history of fever, abdominal
distension. Child did not have vomiting,
headache, and loss of appetite. Clinical examination did not reveal any signs of
peritonitis or meningitis. Peritoneal end
of the VP shunt was protruding through
the anus [Figure 1]. There was dribbling
of cerebrospinal fluid (CSF) at the distal
end of VP shunt. Child was investigated
with plain X-ray abdomen erect and
ultrasonography of abdomen. X-ray
abdomen erect confirmed the peritoneal
end of the shunt tube going well beyond
the pubic symphysis [Figure 2]. There
was no knotting of the shunt tube seen.
No gas under diaphragm was noted.
Ultrasonography of the abdomen and
pelvis could not trace the distal end of
shunt tube. The absence of ascites further
supported the diagnosis. After preoperative
evaluation and counseling with parents, he
was posted for surgery. A small incision
was taken at the neck and the tube was
cut. Then migrated peritoneal end of VP
shunt which was visible per anus was
gently pulled, and the shunt was delivered
out. Remaining shunt system with shunt
chamber was removed after exploring
previous parietal incision. Postoperatively,
the patient was kept nil by mouth for
1 day and then gradually started on oral
feeds, after confirming the presence of
peristalsis. Postoperatively, he did not
have any features of raised intracranial
pressure. After 3 weeks, repeat computed
tomography of the brain showed no
hydrocephalus; hence, no further CSF.
Discussion
The term hydrocephalus is derived from the Greek words
“hydro” meaning water and “cephalus” meaning head. As
the name implies, it is a condition in which the primary
characteristic is an excessive accumulation of fluid in the
brain. It is a commonly encountered entity in neurosurgical
practice. Shunt remains the most common procedure done
for hydrocephalus. Shunts can be VP, theco-peritoneal,
ventriculoatrial, or ventriculopleural. VP shunt is associated
with a complication rate of 24–47%, of which mechanical
blockage of the shunt is most common.[1]
The risk of abdominal complication associated with VP
shunt is 25%, and incidence of bowel perforation with
protrusion of VP shunt per anus is 0.1–0.7%.[2,3]
Bowel perforation is a rare but serious complication of VP
shunt surgery. It has high mortality rate around 15%.[4] It is
very important to identify this unusual serious complication
as it carries a risk of ascending infection to the brain in the
form of meningitis, encephalitis, or brain abscess.[5,6]
Sharma et al.
[7] reported a similar case of a child
of 2 years who presented with the lower end of the
ventriculoperitoneal shunt tube coming out through
the anus. The child was asymptomatic on presentation.
Colonoscopy revealed the site of perforation to be in the
rectum, 10 cm from the anal verge. After disconnecting the
cranial end of the shunt, it was removed endoscopically
without any further complications.
Teegala and Kota[8] reported two cases of anal extrusion
and pointed that the poor nutritional status along with
infection could have been the precipitating cause.
In the majority of the cases, bowel perforation is
asymptomatic. A few can present with complications such
as intestinal obstruction, adhesion, and tube knotting, which infected pseudocyst, or an abscess develop, exploratory
laparotomy is required for removing the shunt catheter and
tackling the problem accordingly.[7] It is also important to
check knotting of the shunt tube on the plain radiograph
abdomen. Knotting of shunt tube can create difficulties
during shunt removal per anus. In such case, it is better to
go for exploratory laparotomy rather than simply removing
shunt per anus.
Bowel perforation in patients with VP shunt should be
considered with Gram‑negative meningitis or abdominal
symptoms. The optimum treatment of such a patient would
be decided by the presence of features of sepsis, perforation
peritonitis, or intraperitoneal abscess. In a patient with
simple bowel perforation and no other complications,
a formal exploratory laparotomy is not required. The
shunt should be disconnected at the abdominal wall, and
the lower end should be removed through the rectum by
colonoscopy or sigmoidoscopy/proctoscopy. The distal
end of the VP shunt should not be pulled back into the
peritoneal cavity to prevent contamination of the tract.
External ventriculostomy should be established at least for
3 weeks and the patient should be put on broad spectrum
antibiotics to prevent infection of CSF. After repeated
CSF cultures are sterile, the patient should undergo repeat
VP shunt on the opposite side. In patients with bowel
perforation peritonitis, they should undergo exploratory
laparotomy with removal of the shunt, thorough lavage,
and primary closure of the bowel wall.[16]
The treatment of a VP shunt perforating the bowel is a
medical emergency. The perforating part of the catheter
must be removed, and an external drainage of the proximal
part is needed together with antibiotic prophylaxis. In
general, there are three methods by which the catheter
can be removed: By pulling it through the anus, by
endoscopic removal, or by surgical removal. Nevertheless,
the management of the bowel perforation must be
individualized. The shunt is externalized at its upper end,
and once the CSF cultures are negative, a new peritoneal
shunt catheter can be placed intra-abdominally few weeks
later. If there is no accompanying peritonitis or abdominal
abscess, then percutaneous or endoscopic removal of
the abdominal shunt catheter can be performed without
surgery. The fibrous tissue surrounding the perforation
does not permit the spillage of bowel contents into the
peritoneal cavity. Laparotomy must be performed in cases
of intra-abdominal infection (peritonitis or abscess) or
when the fistulous tract does not close spontaneously after
percutaneous or endoscopic removal.[17]
Awareness of this unusual complication among general
surgeons and physicians is very important so that early
recognition, management, and timely intervention can save
the life of the patient. Our case highlights the rarity of this
complication, pathogenesis, and its management. There is warrant skilled management.[9-11] Because of weak bowel
musculature, children are more susceptible to intestinal
perforation.[12]
Various mechanisms have been suggested with regard to
the pathogenesis of the perforation, namely, foreign body
reaction, pressure necrosis of intestinal wall by the tube,
and silicon tube allergy. The catheter, most commonly
associated with perforations, is the Raimondi spring coiled
catheter. The introduction of softer, more flexible silastic
tubing has reduced but not totally eliminated the incidence
of bowel perforation.[13] There have been suggestions
to anchor the distal end of the peritoneal tube to the
peritoneum in children. This simple method does not add
much to the operation time and has prevented shunt-tube
migration in the group studied.[14] The perforation of
the bowel lumen can also occur when the freely moving
catheter gets adherent to the serosa of a viscus and the
beveled end of the tube, coupled with the continuous
water hammer effect of the CSF pulsations, penetrate the
walls, and eventually perforate the viscus. Thereafter, the
peristaltic waves drive the “foreign body” forward.[15]
In our case, the patient was operated for the malfunctioning
of peritoneal end 6 months prior and postoperatively had
abdominal distension. We suggest abdominal adhesions and
thin bowel wall in a child were possible mechanism leading
to bowel perforation and subsequently anal extrusion of VP
shunt.
The management of these cases involves shunt
removal/exteriorization, control of infection, and reinsertion
of the shunt at an appropriate time. Asymptomatic cases
without peritonitis and meningitis can safely be managed
by simply removing shunt per anus, after disconnecting
the shunt tube in the neck. Rest of the shunt system can
then be removed through parieto occipital incision. This
will obviate the need for laparotomy. However, in cases
where serious abdominal complications such as peritonitis, no need to hurry for CSF diversion procedures unless the
patient is clinically symptomatic.
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