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 »  Case Report
 »  Discussion
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CASE REPORT
Year : 2003  |  Volume : 51  |  Issue : 2  |  Page : 248-249

Extranasal glial heterotopia: Case report


Departments of Paediatric Surgery, St. John’s Medical College Hospital, St. John’s National Academy of Health Sciences, Bangalore-560034.

Correspondence Address:
Department of Paediatric Surgery, St. John’s Medical College Hospital, St. John’s National Academy of Health Sciences,
[email protected]

  »  Abstract

Glial heterotopia or the occurrence of isolated non-teratomatous extracranial glial tissue is rare. We report a neonate with extensive extranasal glial heterotopia involving the left buccopharyngeal region, palate and base of the skull and presenting with respiratory distress and a bleeding oral mass. A staged operative approach was adopted to excise the lesion. The literature on the subject is briefly reviewed.

How to cite this article:
Mohanty S, Das K, Correa M A, Cruz A J. Extranasal glial heterotopia: Case report . Neurol India 2003;51:248-9


How to cite this URL:
Mohanty S, Das K, Correa M A, Cruz A J. Extranasal glial heterotopia: Case report . Neurol India [serial online] 2003 [cited 2022 May 25];51:248-9. Available from: https://www.neurologyindia.com/text.asp?2003/51/2/248/1097


The occurrence of isolated extracranial glial tissue is rare, and the majority of these are located in the head and neck.[1] The nose and the nasopharynx are the commonest sites, hence the terms 'nasal glioma' or 'nasal glial heterotopia' are used to describe these lesions.[2] Extranasal sites of glial heterotopia are rarer.[3] We report a rare case of a neonate with extensive extranasal glial heterotopia.

   »   Case Report
 Top

A five-day, full-term normocephalic female weighing 2.25 kg had respiratory distress and oral bleeding. She required an immediate endotracheal intubation and was then shifted for surgery. A polypoidal bleeding mass protruding anterior to the tonsillar fossa was cauterized. The neonate recovered rapidly.
At follow-up examination, the infant was seen to have thrived normally but had a noisy respiration and had also developed a progressively prominent left cheek contour. Examination under anesthesia revealed a bulge of the left lateral buccopharyngeal wall displacing the left tonsil and palate medially. CT scan of the head showed a soft tissue mass of heterogeneous density occupying the left buccal and parapharyngeal regions with extensions into the hard palate, the temporal and infratemporal fossae, the pterygomaxillary fissure, the apex of the orbit and the superior and inferior orbital fissures and an intracranial extension adjacent to the left cavernous sinus [Figure - 1]. A complete ophthalmologic examination, however, was normal.
A combined approach involving an external extended parotid incision and an intraoral sulcus incision with extension onto the cheek was performed to excise the mass. The cystic solid mass was excised piecemeal with all its extensions except that coursing along the orbital fissure intracranially.
The material from the palatal, parapharyngeal and temporal mass consisted of nodular to irregular flat pieces of pale brown soft tissue with grey-white and pale brown cut surfaces. Histological examination of stained sections from the palatal and parapharyngeal mass showed a diffuse unencapsulated mass of glial tissue, the cellular elements of which consisted largely of astrocytes with oval vesicular nuclei in a fibrillary background. An occasional neuron as well as foci of calcification were seen. Immunohistochemistry with GFAP confirmed the glial nature of the tissue.
At follow-up the child was growing normally and was asymptomatic. Serial CT scans showed minor residual lesion adjoining the left cavernous sinus, which was observed to be shrinking and progressively calcifying.

   »   Discussion Top


Non-teratomatous extracranial glial tissue is an uncommon lesion and has been reported in 2 general locations-paraneuraxial and remote from the neuraxis.[3] The paraneuraxial heterotopias are postulated to be protrusions of neuroglial tissue from the developing brain or spinal cord that become isolated during maturation of the neuraxis and its surrounding skeleton.[3] The majority of these lesions present as congenital intranasal or nasopharyngeal masses and are commonly referred to as 'nasal gliomas'. Since these are developmental anomalies rather than true neoplasms, they are more appropriately termed nasal glial heterotopias.[2] Reported extranasal locations include the orbit,[4] palate,[5] skin,[6] temporoparietal and occipital regions,[7] submandibular region[8] and overlying the spine.[1] Paraneuraxial glial heterotopias, as in the present case, occasionally have associated intracranial extensions through normal or abnormal skull base fissures and nasoocular clefts.[9] The lack of a meningeal component in most of these lesions mitigates against the embryogenetic theory of herniation and sequestration of brain tissue.[1] In most cases, there is no communication between the heterotopic glia and the adjacent brain or spinal cord. Nasal obstruction, cerebrospinal fluid rhinorrhoea and meningitis are the usual presentations in nasal location[2] while extranasal masses have a less predictable presentation. Neuroglial heterotopia remote from the neuraxis, has been reported in intrapulmonary and peritoneal locations.[3] Most occur in association with neural tube defects and are thought to be due to shedding of neuroglial elements into the amniotic fluid with subsequent implantation into tissues developing in direct contact with them.[3]
Histologically, glial heterotopia is composed of astrocytes interspersed with fibrous tissue while occasional neurons as seen in this case are found in 10% of cases.[10],[11] An unusual case with mature neurons dominating the picture has also been reported.[12] The presence of neurons has been attributed to the entrapment of these elements during herniation while their absence in most cases has been ascribed to tissue hypoxia or lack of developmental exposure to migrating neuroblasts.[13]
Heterotopic glial masses are benign and their management includes adequate preoperative imaging and a radical surgical excision.  

  »   References Top

1.Skelton HG, Smith KJ. Glial heterotopia in the subcutaneous tissue overlying T-12. J Cutan Pathol 1999;26:523-7.  Back to cited text no. 1  [PUBMED]  
2.Chan JKC, Lau W. Nasal astrocytoma or nasal glial heterotopia. Arch Pathol Lab Med 1989;113:943-5.  Back to cited text no. 2    
3.Kershisnik MM, Kaplan C, Craven CM, et al. Intrapulmonary neuroglial heterotopia, Arch Pathol Lab Med 1992;116:1043-6.   Back to cited text no. 3  [PUBMED]  
4.Newman NJ, Miller NR, Green WR. Ectopic brain in the orbit. Ophthalmology 1986;93: 268-72.  Back to cited text no. 4  [PUBMED]  
5.Shapiro MJ, Mix BS: Heterotopic brain tissue of the palate. Head Neck Surg 1968;87:96-100.  Back to cited text no. 5    
6.Orkim M, Fischer I. Heterotopic brain tissue (heterotopic neural rest). Arch Dermatol 1966;94:699-708.  Back to cited text no. 6    
7.Lantos PL, VandenBerg SR, Kleihues P. Tumours of the nervous system In: Graham DI, Lantos PL, editors. Greenfield's Neuropathology. 6th edn. London: Arnold; 1997. Vol. II. pp. 787.  Back to cited text no. 7    
8.Okeda R. Heterotopic brain tissue in the submandibular region and lung: report of two cases and comments about pathogenesis. Acta Neuropathol 1978;43:217-220.  Back to cited text no. 8    
9.Thomas HG, al Qattan MM, Becker LE. Nasal gliomas : Is dermis involvement significant? Ann Plast Surg 1995;34:168-172.  Back to cited text no. 9    
10.Karma P, Rasanen O, Karja J. Nasal gliomas: A review and report of 2 cases. Laryngoscope 1977;87:1169-79.  Back to cited text no. 10  [PUBMED]  
11.Ramakrishnan MS, Dayalan N. Nasal glioma associated with defect of the nasal ala. J Pediatr Surg 1971;6:491.  Back to cited text no. 11  [PUBMED]  
12.Mirra SS, Pearl GS, Hoffman JC, et al. Nasal glioma with prominent neuroglial component. Arch Pathol Lab Med 1981;105:540-1.  Back to cited text no. 12  [PUBMED]  
13.Black BK, Smith DE. Nasal glioma: Two cases with recurrence. Arch Neurol Psychiatry 1950;64:614-30.  Back to cited text no. 13    

 

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