Meningitis is a rare but serious complication in patients with Currarino syndrome. We present a 6-year-old girl with a fulminant meningitis due to an enterothecal fistula involving the anterior sacral meningocele. Initial treatment consisted of broad-spectrum intravenous antibiotic therapy and laparoscopic construction of a deviating double-loop ileostomy. This was followed by an elective posterior neurosurgical approach with a sacral laminectomy, evacuation of the empyema, and securing the disconnection of the anterior meningocele from the thecal sac, 10 days after initial hospital admission. The girl made a good postoperative recovery. The treatment strategy in the setting of meningitis due to an inflamed anterior meningocele is discussed and the available literature on the topic is reviewed.
In 1981, Guido Currarino et al. were the first to describe a triad consisting of (1) partial sacral agenesis; (2) presacral mass (anterior meningocele, enteric cyst, teratoma); and (3) anorectal malformation/stenosis . There are no generally accepted guidelines about the indication and timing of surgical correction of an anterior sacral meningocele. Neither are there known risk factors predicting which patients with Currarino syndrome are prone to develop meningitis due to an enterothecal fistula. It is also unknown whether there is a relationship between (increase of) the size of the anterior meningocele and the chance of developing an enterothecal fistula. Different surgical approaches (anterior/posterior/sagittal) to close and resect the meningocele have been reported in the literature . Here, we present our experience with a young patient with Currarino syndrome suffering from meningitis due to an enterothecal fistula and give an overview of the available literature on the topic.
Case report of an illustrative patient
A 6-year-old girl presented with headache, drowsiness, and opisthotonus. She had been diagnosed with familial Currarino triad with associated constipation and micturition problems. Repeated lumbosacral MRI scans over the years had revealed slight increase of the anterior meningocele (see Fig. 1). Four days before admission, the patient was treated with antibiotics in another hospital because of a suspected urinary tract infection. At presentation in the emergency room, she was drowsy (GCS 3-5-2) with severe opisthotonic posturing (see Fig. 2a), but without focal neurological signs. Her body temperature was 36.6 °C. Blood leucocyte count and C-reactive peptide were 23.2 × 109 /L and 214 mg/L, respectively. Analysis of the cerebrospinal fluid (CSF) revealed a pleocytosis with 6659 × 106 /L cells and glucose < 0.1 mmol/L. Antibiotic treatment was immediately started and consisted of intravenous ceftazidime and metronidazole for 6 weeks. Culture of the CSF rendered Streptococcus anginosus (milleri) and Bacteroides fragilis. Because of the multimicrobial culture and her medical history, an enterothecal fistula was suspected. Gadolinium-enhanced MRI of the lumbosacral region revealed inflammation of the anterior meningocele with abscess formation (see Fig. 2b).
Multidisciplinary rounds with pediatric neurologists, pediatric surgeons, pediatricians, microbiologists, and neurosurgeons resulted in the decision to first perform a laparoscopic deviating double-loop ileostomy in the acute stage, in order to stop the inflow of enteral commensals in the CSF space and inflamed retroperitoneal and epidural area. A few days after the formation of an ileostomy, a contrast study of the rectal stump confirmed leaking of contrast through a rectal fistula to the area of the anterior meningocele. Ten days after hospital admission, a posterior sacral laminectomy was performed with evacuation of a large amount of empyema and debris from the anterior meningocele and the region around the sacral roots. There was severe fibrosis in the operating field. The connection between the anterior meningocele and thecal sac had closed spontaneously due to inflammation. No patent fistula was found.
After uncomplicated surgery, the clinical course was dominated by the aftermath of the fulminant meningitis. Postoperative MRI confirmed obliteration of the anterior sacral meningocele/enterothecal fistula and a decline of inflammation (see Fig. 3). Initially, the ventricular system was dilated, which was managed by intermittent lumbar CSF-taps. No internal CSF shunt was needed as the hydrocephalus resolved after recovery from the meningitis. Successful restoration of the ileostomy was performed several months later. The girl made a good physical and neurological recovery.
Review of the literature
In an attempt to collect data supportive for any specific strategy or approach, we performed a literature search on the topic of Currarino syndrome and meningitis in the databases of PubMed, Web of Science, and Embase, using the following search terms: [currarino], [meningitis], [anterior meningocele], and [inflammation]. The search rendered 37 publications describing 38 patients (Table 1). All were single case studies, except for one article describing two young infants suffering from the condition. The series comprises 17 pediatric patients and 20 adult patients (information on the age of one patient missing). The known female predominance of Currarino syndrome was confirmed with a F:M ratio of 24:13 (information on the gender of one patient missing). These case reports show that meningitis due to formation of an enterothecal fistula can be fatal [1, 16, 17]. In the series here described, a posterior surgical approach was chosen in 16 patients and an anterior surgical approach was chosen in 3 patients. For 16 patients, the surgical technique was not described in detail. In 3 cases, no surgery was performed (these 3 cases related to the three deceased patients in the series). Concerning the timing of surgery in the setting of meningitis and an infected meningocele, only 8 publications give adequate information. The timing of surgery ranged between day 1 and day 22 after hospital admission (and starting of antibiotic therapy), with a mean of 16 days and a median of 21 days before surgical correction of the fistula and the meningocele. For two patients, it was decided to plan the surgical repair in elective setting, after initial discharge home from the hospital when the meningitis was treated sufficiently (this included one patient with aseptic meningitis due to a dermoid tumor).
In the case presented, it was decided to first perform an ileostomy, to be completely sure of a stop of leaking of intestinal microbial flora through the enteral fistula(s). This was followed by an elective posterior neurosurgical exploration. This seems to be an effective strategy. In the literature, we noticed the preference for a posterior approach in the situation of severe inflammation. This is in line with our experience in the case here described. In a posterior approach, important neurological structures are directly visualized and can be spared. A detethering procedure, for example cutting of the filum terminale, or removal of an intradural tumor (e.g., dermoid or teratoma), is conveniently possible during the same approach. A possible disadvantage is the suboptimal view on the rectum and the retroperitoneal/enteral anatomy. This is especially true in a situation of severe inflammation. In our experience, successful surgical closing of an enteral defect in the setting of active inflammation is not possible. Hence, a temporary ileostomy is an indispensable and elegant solution to overcome this problem. It is known from a significant body of literature, mainly from the GE-surgical field, that rectal fistula will close spontaneously if there is no passage of fecal material for some time because of an ileostomy .
The current available literature on the topic of meningitis, due to an inflamed anterior meningocele caused by an enterothecal fistula, is limited to case reports only. Therefore, evidence-based guidelines/protocols for Currarino patients developing meningitis due to an enterothecal fistula cannot be formulated. There is no high-quality literature on the natural history of Currarino patients with an anterior sacral meningocele to justify the prophylactic surgical correction of an anterior meningocele in all Currarino patients, solely aiming to prevent meningitis. Numbers needed to treat (NNT) to prevent one case of meningitis are unavailable. If the patient experiences other clinical symptoms that could be alleviated by surgical correction of the anterior sacral meningocele, this would of course justify a more aggressive surgical strategy towards closure and resection of the meningocele.
The present case and review of the literature illustrates that in patients with Currarino syndrome potentially lethal meningitis can occur due to the development of an enterothecal fistula. In our own limited experience and supported by the literature, the construction of an ileostomy in the acute stage seems a safe and rational start of the (surgical) treatment, together with administration of high-dose, broad-spectrum intravenous antibiotics. Subsequent surgical treatment of the enterothecal fistula and infected anterior sacral meningocele can be performed in an elective procedure, as soon as the patient has recovered from the most severe symptoms of the meningitis. A posterior approach is most often described in the literature, and seems to offer the best anatomical overview in the setting of (recent) inflammation. There is currently no supportive evidence for early prophylactic surgery in Currarino patients with an anterior sacral meningocele to prevent meningitis.
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Jeltema, H., Broens, P.M.A., Brouwer, O.F. et al. Severe bacterial meningitis due to an enterothecal fistula in a 6-year-old child with Currarino syndrome: evaluation of surgical strategy with review of the literature. Childs Nerv Syst 35, 1129–1136 (2019). https://doi.org/10.1007/s00381-019-04138-8
- Bacterial meningitis
- Currarino syndrome
- Enterothecal fistula