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CASE REPORT
Year : 2011  |  Volume : 6  |  Issue : 1  |  Page : 40-43
 

Anterior sacral meningocele presenting as constipation


Department of Pediatric Surgery, Chacha Nehru Bal Chikitsalaya and Maulana Azad Medical College, Geeta Colony, Delhi, India

Date of Web Publication2-Sep-2011

Correspondence Address:
Anup Mohta
28-B, Pocket-C, S. F. S. Flats, Mayur Vihar Phase-III, Delhi-110 096
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1817-1745.84406

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   Abstract 

Anterior sacral meningocele (ASM) is a rare form of spinal dysraphism in children. Usually asymptomatic, it can present as constipation, urinary problems or rarely neurological symptoms. High index of suspicion with careful clinical examination is necessary to make early diagnosis. Magnetic resonance imaging is the investigation of choice. We describe a successfully managed young child with ASM associated with rib and vertebral defects.


Keywords: Anterior sacral meningocele, child, constipation, rib defects


How to cite this article:
Mohta A, Das S, Jindal R. Anterior sacral meningocele presenting as constipation. J Pediatr Neurosci 2011;6:40-3

How to cite this URL:
Mohta A, Das S, Jindal R. Anterior sacral meningocele presenting as constipation. J Pediatr Neurosci [serial online] 2011 [cited 2019 Jun 20];6:40-3. Available from: http://www.pediatricneurosciences.com/text.asp?2011/6/1/40/84406



   Introduction Top


Anterior sacral meningocele (ASM) is an anomaly where the meninges protrude into retroperitoneal and presacral space through an anterior sacral defect. Most of the cases present in adult age and diagnosis in childhood is rare. Common presentations include infection, meningitis and obstetric problems. We report a 19-month-old child with ASM presenting with constipation and urinary problems which improved after surgery through abdominal approach. Bilateral rib and vertebral defects seen in our patient have not been described in literature earlier.


   Case Report Top


A 19-month-old female child presented to the hospital with complaints of constipation since 6 months of age and difficulty in passing urine for last 6 months. Parents had noticed lower abdominal fullness for last 1 year. The child was born out of non-consanguineous marriage between young parents at full term by an uncomplicated vaginal delivery. Antenatal ultrasound screening had not been performed. There was no history suggestive of birth asphyxia or trauma. The parents gave history of increasing constipation for which laxatives and enemas had been advised but did not provide relief. The child passed small amounts of urine at short intervals.

The child weighed 7.2 kg and other anthropometric parameters including head circumference were appropriate for age. Chest examination revealed multiple rib defects on both sides but air entry was normal without any added sounds. Abdominal examination revealed a cystic mass in the suprapubic region arising out of pelvis and reaching up to umbilicus. Digital rectal examination showed normal tone of the normally placed anus but a large cystic mass was felt posteriorly which precluded higher examination. Examination of the spine at the back did not show any bony defects. There was no neurological deficit.

Hematological investigations showed hemoglobin of 11.2 g/dL, TLC of 12,000 per cc and platelets of 117×10 3 per mm 3 . Kidney function tests were normal.

X-ray chest [Figure 1] showed multiple segmentation anomalies of cervicodorsal vertebrae along with fusion anomalies of ribs on both sides. Echocardiogram did not show any associated cardiac anomaly. Ultrasound of abdomen demonstrated a cystic lesion posterior to urinary bladder measuring 9×4 cm with well-defined dome shaped upper margin and tapering inferiorly. No internal echoes were seen within the lesion. Urinary bladder was pushed anteriorly. There was no evidence of hydroureteronephrosis. Barium enema demonstrated Scimitar sign along with increased presacral space, displacement of the rectum anteriorly and sigmoid colon to the right [[Figure 2]a and b]. Computed tomography [[Figure 3]a and b] showed an anterior sacral dysraphic defect with large cystic mass in presacral region displacing the urinary bladder anteriorly and to the right side. Posteriorly, mass was seen entering the spinal canal through large sacral bone defect. There was no hydrocephalus. Both the kidneys were displaced and rotated through their axis but there was no evidence of hydronephrosis.
Figure 1: Plain X-ray chest showing multiple segmentation anomalies of cervicodorsal vertebrae along with fusion anomalies of ribs on both sides

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Figure 2: Barium enema showing a) Scimitar sign; and b) increased presacral space and displacement of rectum

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Figure 3 (a,b): Computed tomography showing anterior sacral meningocele with a) communication with the sacral defect; and b) displacement of urinary bladder to the left

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An exploratory laparotomy was performed by a suprapubic transverse incision with intent to excise the meningocele from anterior route. A cystic lesion measuring about 8×4 was seen emerging within the leaves of sigmoid mesocolon from the anterior part of sacrum in the pelvis. The sigmoid colon was pushed to the right while urinary bladder was pushed to the left side [Figure 4]. The sac was dissected till the base. The sac was opened at the apex, clear cerebrospinal fluid (CSF) was aspirated and the sac was excised with watertight closure of the tapering base saving the nerve roots and controlling epidural veins. Closed dural defect was checked for leakage of CSF and hemostasis and then covered with local tissue. CSF was sent for culture and sac was sent for histopathological examination (HPE). The CSF culture was reported as sterile while HPE report showed fibrocollagenous and fibrofatty tissue with few entrapped blood vessels and occasional nerve fibers.
Figure 4: Operative photograph showing the anterior sacral meningocele with displacement of urinary bladder and sigmoid colon

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There was no neurological deficit in the immediate postoperative period. There was no evidence of constipation, urinary complaints or hydrocephalus at 6 months of follow-up. Although the rib defects have not caused any clinical problem till now, the child remains in follow-up to manage if need arises.


   Discussion Top


ASM is an exceedingly rare form of spinal dysraphism characterized by protrusion of dural sac anterior through a defect in the anterior aspect of sacrum. [1],[2] These are labeled as Type 1B according to Nabors' classification. [3] Very few cases have been described in early childhood.

ASMs mostly result from failure of fusion of the sacrum with subsequent herniation of the sacrum meninges into the sacral hollow. North et al., [4] have classified the possible mechanisms leading to ASM as:

  1. Congenital:
    1. Sacral bone defect
    2. Proliferation of arachnoid
    3. Connective tissue disorders
  2. Degenerative: Ischemic lesion
  3. Traumatic: Nerve root avulsion or hemorrhage
  4. Iatrogenic: During surgery


ASM may be associated with syndrome like Currarino syndrome which includes anorectal malformations, sacral bony defect and presacral mass; and Marfan's syndrome wherein the etiology may be disorder of collagen biosynthesis and structure at the dural level. [3] Bilateral multiple rib defects seen in the present case have not been described in the available English literature till now. Autosomal dominant transmission of the disease has been said to cause familial occurrence of ASM. [5],[6],[7]

Owing to occult nature, these lesions usually present later in life. These could present with constipation, urological symptoms or rarely neurological symptoms. More than three-fourth cases are seen in women of reproductive age who are more likely to have diagnosis of asymptomatic ASM during pelvic examination. In this group of patients, ASM may lead to infertility and difficult labor.

Young children mostly present with chronic constipation or retention of urine. [8] A child with constipation may be treated with laxatives for long periods or misdiagnosed as Hirschsprung's disease. This can be avoided by often ignored digital rectal examination. The cysts may become secondarily infected leading to meningitis [9] and to pyocele. Associated tethered cord could present with neurological signs. [10] Rarely, these can be occupied by epidermoid cyst [11] or could rupture into the rectum. ASM has been reported to be misdiagnosed as ovarian cyst at many occasions. [12]

Radiological investigations include plain and contrast radiographs, ultrasound, computed tomography and magnetic resonance imaging (MRI). 'Scimitar' sign, a smooth curved unilateral sacral defect simulating shape of Arabic sabre on plain X-ray, is considered to be pathognomonic of ASM. [13] Contrast enema, which may show displacement of rectum, sigmoid colon and urinary bladder, is now obsolete for diagnosis. Abdominal and spinal sonography should be the first diagnostic investigation and can diagnose ASM and differentiate it from other cystic lesions in the pelvis. [14] Imaging for screening for ASM and presacral teratoma should be directed at identifying the presacral mass rather than sacral bony defect. Thus computed tomography or MRI is recommended as the screening modality. [15] Computed tomography, diagnostic in the present case, has been replaced by MRI as the radiological investigation of choice.

Good clinical examination and radiological investigations should be able to differentiate ASM from other causes of cystic presacral masses in children which include a) sacrococcygeal teratoma (Altman type 4); b) tumors like dermoid, lipomas, neuroblastoma; c) neuroectodermal cyst; d) rectal duplication cyst; e) ovarian cyst and f) pelvic kidney among others.

Surgery is the mainstay for management of ASM. Surgery should aim to obliterate the communication between meningocele and the spinal subarachnoid space; to decompress the pelvic structures by meningocele excision; and to untether the spinal cord, if necessary. [16],[17] Standard approach for ASM is through posterior sacral laminectomy. This route permits ligation of the base, to disrupt its connection with the thecal sac and also manage tethered cord if present. Dural fibrin patch may be used to close the open defect. [18] One has to be careful to preserve nerve roots in the vicinity to prevent post operative neurological complications.

An open anterior transperitoneal abdominal approach was used in our case as the large ASM was reaching up to the umbilicus and had a large neck. Anticipated difficulty in managing the large ASM, excellent exposure available, and previous experience of this approach guided in preferring this approach. Limitation of this procedure is the management of caudal spinal cord anomalies as deep pelvic dissection is difficult. [19],[20]

Laparoscopic approach for surgical management of ASM is increasingly being used. [21],[22] This is especially useful for narrow-based ASM which may be suture ligated. A posterior sagittal approach may be useful in management of ASM associated with anorectal malformations in Currarino syndrome. [23],[24]

 
   References Top

1.Villarejo F, Scavone C, Blazquez MG, Pascual-Castroviejo I, Perez-Higueras A, Fernandez-Sanchez A, et al. Anterior sacral meningocele: Review of the literature. Surg Neurol 1983;19:57-71.  Back to cited text no. 1
    
2.Sharma V, Mohanty S, Singh DR. Uncommon craniospinal dysraphism. Ann Acad Med Singapore 1996;25:602-8.  Back to cited text no. 2
    
3.North RB, Kidd DH, Wang H. Occult, bilateral anterior sacral and intrasacral meningeal and perineurial cysts: Case report and review of the literature. Neurosurgery 1990;27:981-6.  Back to cited text no. 3
    
4.Nabors MW, Pait TG, Byrd EB, Karim NO, Davis DO, Kobrine AI, et al. Updated assessment and current classification of spinal meningeal cysts. J Neurosurg 1988;68:366-77.  Back to cited text no. 4
    
5.Marin-Sanabria EA, Nagashi T, Yamamoto K, Nakamura Y, Aihara H, Kohmura E. Presacral meningocele associated with hereditary sacral agenesis and treated surgically: Evaluation in three members of the same family. Neurosurgery 2005;57:E597.  Back to cited text no. 5
    
6.Andersen C, Tange M, Bjerre P. Anterior sacral meningocele occurring in one family. An autosomal dominantly inherited condition. Br J Neurosurg 1990;4:59-62.  Back to cited text no. 6
    
7.Yates VD, Wilroy RS, Whitington GL, Simmons JC. Anterior sacral defects: An autosomal dominantly inherited condition. J Pediatr 1983;102:239-42.  Back to cited text no. 7
    
8.Bedi NK, Chadha R, Bagga D, Anand R, Mohta A. Anterior Sacral Menningocele: An uncommon cause of constipation in early childhood. Indian Pediatr 1992;29:1157-60.  Back to cited text no. 8
    
9.Blond MH, Borderon JC, Despert F, Laugier J, Maheut J, Robert M, et al. Anterior sacral meningocele associated with meningitis. Pediatr Infect Dis J 1991;10:783-4.  Back to cited text no. 9
    
10.Hara Y, Shirane R, Yoshimoto T. Anterior sacral meningocele associated with tethered cord syndrome. No Shinkei Geka 1992;20:1217-21.  Back to cited text no. 10
    
11.Shamoto H, Yoshida Y, Shirane R, Yoshimoto T. Anterior sacral meningocele completely occupied by an epidermoid tumor. Childs Nerv Syst 1999;15:209-11.  Back to cited text no. 11
    
12.Erdogmus B, Yazici B, Ozdere BA, Safak AA. Anterior sacral meningocele simulating ovarian cyst. J Clin Ultrasound 2006;34:244-6.  Back to cited text no. 12
    
13.Kovalcik PJ, Burke JB. Anterior sacral meningocele and the scimitar sign. Report of a case. Dis Colon Rectum 1988;31:806-7.  Back to cited text no. 13
    
14.Naidich TP, Fernbach SK, McLone DG, Shkolnik A. John Caffey Award. Sonography of the caudal spine and back: Congenital anomalies in children. AJR Am J Roentgenol 1984;142:1229-42.  Back to cited text no. 14
    
15.Singh SJ, Rao P, Stockton V, Resurreccion L 3 rd , Cummins G. Familial presacral masses: Screening pitfalls. J Pediatr Surg 2001;36:1841-4.  Back to cited text no. 15
    
16.Smith HP, Davis CH Jr. Anterior sacral meningocele: Two case reports and discussion of surgical approach. Neurosurgery 1980;7:61-7.  Back to cited text no. 16
    
17.Tani S, Okuda Y, Abe T. Surgical strategy for anterior sacral meningocele. Neurol Med Chir (Tokyo) 2003;43:204-9.  Back to cited text no. 17
    
18.Bayar AM, Yasitli U, Tekiner A, Gokcek C, Edebali N, Erdem Y, et al. Anterior sacral meningocele. A case report. J Neurosurg Sci 2007;51:89-92.  Back to cited text no. 18
    
19.Ashley WW Jr, Wright NM. Resection of a giant anterior sacral meningocele via an anterior approach: Case report and review of literature. Surg Neurol 2006;66:89-93.  Back to cited text no. 19
    
20.Tuzun Y, Izci Y, Polat KY. Anterior sacral meningocele: Excision by the abdominal approach. Pediatr Neurosurg 2005;41:244-7.  Back to cited text no. 20
    
21.Trapp C, Farage L, Clatterbuck RE, Romero FR, Rais-Bahrami S, Long DM, et al. Laparoscopic treatment of anterior sacral meningocele. Surg Neurol 2007;68:443-8.  Back to cited text no. 21
    
22.Işik N, Balak N, Kircelli A, Göynümer G, Elmaci I. The shrinking of an anterior sacral meningocele in time following transdural ligation of its neck in a case of the Currarino triad. Turk Neurosurg 2008;18:254-8.  Back to cited text no. 22
    
23.Somuncu S, Aritürk E, Iyigün O, Bernay F, Rizalar R, Günaydin M, et al. A case of anterior sacral meningocele totally excised using the posterior sagittal approach. J Pediatr Surg 1997;32:730-2.  Back to cited text no. 23
    
24.Massimi L, Calisti A, Koutzoglou M, Di Rocco C. Giant anterior sacral meningocele and posterior sagittal approach. Childs Nerv Syst 2003;19:722-8.  Back to cited text no. 24
    


    Figures

  [Figure 1], [Figure 2], [Figure 3], [Figure 4]


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