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Ventriculoperitoneal
shunt is a shunt system that derives excess LCS from the ventricular cavities
into the peritoneal cavity. The intra-abdominal pseudocyst (PKIA) is a rare
complication. We report our experience on two observations.
Keywords: Hydrocephalus, Ventriculoperitoneal shunt,
Pseudocyst, Intra-abdominal
INTRODUCTION
Ventriculoperitoneal shunt is a shunt system
that derives excess CSF from ventricular cavities (hydrocephalus) to the
peritoneal cavity. Various complications have been noted (infectious,
mechanical, hemorrhagic). The intra-abdominal pseudocyst (PKIA) is a rare
complication, reported in the literature by some authors and whose
physiopathological mechanisms and management is not yet well codified [1-4]. We
report our experience on two observations.
OBSERVATION 1
6 year old patient followed for
post-meningitic hydrocephalus that underwent a ventriculoperitoneal shunt.
Immediate operative follow-up was simple with good positioning of both
ventricular and abdominal catheters as evidenced by a cranioencephalic CT scan
and an ASP radiograph (Figure 1).
At day 10 postoperative, the patient is
readmitted for localized abdominal pain in the left flank. An abdominal CT
showed a retro-peritoneal fluid collection with the distal tip of the
intra-cystic abdominal catheter. Surgical revision is performed with
intraperitoneal catheter repositioning and cyst evacuation puncture. The
immediate postoperative course is marked by an amendment of the painful
symptomatology. At D5 of the recovery, there are pains of the right
hypochondrium. The abdominal ultrasound performed found a fluid collection
under the hepatic for which a guided echo puncture was performed to evacuate
the cystic content and relieve the patient. This collection was quickly
reformed after 5 days of surveillance with a larger volume.
After 2 other echo guided punctures not allowing drying up the collection, it is performed a surgical treatment: a ventricular atrial bypass. The ventricular atrial bypass was performed after checking the sterility of the LCS. The postoperative course was simple. On a follow-up of 6 months, the patient remained asymptomatic both neurologically and abdominally. No thromboembolic complications were noted.
OBSERVATION 2
A 22-year-old patient who underwent a
ventriculoperitoneal by-pass at the age of 15 for malformative hydrocephalus presents
with abdominal pain, abdominal meteorism and constipation. In his antecedents,
a surgical revision is reported for a valve disconnection and obstruction of
the proximal catheter which motivated the establishment of a second bypass
system left 2 years ago. The objective clinical examination is an ascitic
oedemato syndrome with a sign of flow and ice. The transparietal puncture
revealed a citrus liquid, transudate-type, germ-free. Abdominal pelvic CT
showed an intraperitoneal cyst with the distal end of the intra-cystic
abdominal catheter. There is also a second abdominal catheter in connection
with the old shunt system. These different catheters were also objectified on
an x-ray of the ASP (Figure 2). A laparotomy with excision of an
intra-peritoneal cyst was performed (Figure
3) and repositioning of the active abdominal catheter associated with
nonproductive catheter ligation. The immediate operative follow-up was simple
and at a follow-up of 4 months, no recurrence was noted.
DISCUSSION
The complications of ventriculoperitoneal
shunt are numerous. The diagnosis is most often suspected at the clinic and
confirmed by neuroradiological explorations. The pseudo abdominal cyst is a
rare complication of ventriculo-peritoneal shunts. It has already been
described in different series, but in your minute proportions [1-4].
It can occur at any age and would be more
common in the pediatric population. Its delay of occurrence is variable. We
noted delays of 10 days and 2 years, respectively, this delay is estimated by
some authors ranging from 5 days to 5 years [1,5]. Its manifestation is
dominated by abdominal signs, namely abdominal pain that can be associated with
a progressive increase of the abdomen. It can thus be defined clinically by
signs of ascites. To a degree, signs of intracranial hypertension can be
observed. The least invasive and most accessible examination is ultrasound [6].
It allows to make the diagnosis but also to perform punctures for the
biological analysis. In certain situations, such as that of patient 2,
ultrasound is not enough. It is more useful to perform abdominal CT. It not
only objectifies the cysts but allows to orientate oneself on the possible
shunt responsible for the cyst and to plan the intervention. Again, CT allows
to circumscribe the cyst and differentiate it from ascites [7,8]. It makes it
possible to follow the evolution of the cyst and to see its possible
intra-abdominal displacements. Indeed, in the absence of flanges, we can note a
migration of the collection. The guided radio punctures have an analgesic
purpose in the decrease of the volume of the collection thus of the abdominal
distension. In his studies notes the impact of guided echo puncture on
symptomatology [7].
One of the major issues that must be
addressed is whether or not there is an infectious origin. It conditions the
support protocol. Hahn et al. reported that infection was the major factor in
the formation of pseudocysts (80%) and pointed out that all cases of
pseudocystic abdomen should be considered to be caused by infection [2]. In our
series, we did not find an infection that justified the administration of
antibiotics.
Several hypotheses have been put forward
concerning the formation of the pseudo cyst. But to date, none of them has been
accepted unanimously. For now, inflammatory and infectious processes are being
discussed. To these should be added factors such as peritonitis, anterior
abdominal surgery with peritoneal adhesions, failure of peritoneal resorption
of LCS by physiological peritoneal dialysis disorder [6,9-12]. In addition, we
can also mention another parameter. That of the surface of the peritoneum which
could play an important role in the resorption of the LCS [13,14]. PKIA support
is still being paid. We have observed (patient 1) that the evacuation punctures
is not a definitive solution. It essentially helps to relieve abdominal
symptoms. Secondly, it was objectified an evolutionary recovery both clinical
and radiological [15].
In spite of the surgical history of patient
2, laparotomy with cyst evacuation and repositioning of the abdominal catheter
were performed. It is preferable to laparoscopy especially in cases of proven
flanges. The evolution has been favorable. However, with regard to bridles
objectified during surgery, the latter may not be safe from recurrence. Indeed,
Laurent et al. [16] has already made a case in his study. What one could not
determine is the probable delay of recidivism if it were to take place.
Moreover, this approach gives us the opportunity to consider a gesture that can
be considered as ultimate. It will be a question of carrying out a ventriculo-atrial
bypass already envisaged also by certain authors [6,12].
In cases where ventriculo-atrial by-pass has
been indicated in pediatric patients, a significant fact must be taken into
account. A possible operative recovery in view of the growth of the patient
will be considered. The atrial catheter may become too short with possibilities
to externalize [15]. These will need to be closely monitored on the one hand
for the monitoring of cardiopulmonary complications but also on mechanical ones
related to the length of the catheter.
The therapeutic possibilities are diverse.
They vary according to the authors. Evacuation punctures, catheter
repositioning after cyst evacuation, laparotomy or laparoscopy have been
reported. In his study of a case and after a review of the literature, Laurent
et al. [16] assume that better results could be obtained. This is the
combination of two principles: external drainage and then repositioning a new
abdominal catheter in another peritoneal location after a delay of
approximately 2 weeks. It will be associated with antibiotic coverage in this
interval [6,12,16].
CONCLUSION
Ventriculo-peritoneal shunt is the treatment
of choice in communicating hydrocephalus. The pseudo intra-peritoneal cyst is a
rare complication whose first description dates from 1954. Its main clinical
manifestations remain an abdominal symptomatology with sometimes signs of
intracranial hypertension. Its physiopathology remains mixed. He was
incriminated against certain factors that could be at the origin of its
occurrence. Its management, which is still not codified, remains based on the
experience of each team with diverse results. A review of the literature should
be established to develop a consensus of treatment.
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JJ, Yu JS, Kim JH, Nam SJ, Kim MJ (2009) Intra-abdominal complications
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YS, Engelhard H, McLone DG (1985-1986) Abdominal CSF pseudocyst: Clinical
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GR (1954) Peritoneal shunt for hydrocephalus utilizing the fimbriae of the
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13. Krediet
RT (2000) The physiology of peritoneal solute transport and ultrafiltration.
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abdominal de liquide céphalo-rachidien chez un adolescent de 14 ans porteur
d’un drain ventriculo-péritonéal. Archives de Pe´diatrie 21: 869-872.
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