Suprasellar Ganglioglioma: Report of a Rare Case

Suprasellar Ganglioglioma: Report of a Rare Case

*Huq N,1   Jahan MI,2  Islam MN,3  Hossain SS,4  Kamal M5

Abstract

Gangliogliomas are rare central nervous system tumors composed of intimately admixed neuronal and glial components. Gangliogliomas are intra-axial masses located predominantly in the temporal lobe, but they can also arise from frontal, parietal and occipital region, and rarer sites include the cerebellum, brainstem and spinal cord. We report a case of a 22 years old female who presented with severe headache, bilateral blurring of vision, generalized weakness and history of convulsion. The lesion was radiologically indistinguishable from meningioma. Histologically the tumor was diagnosed as ganglioglioma by the presence of dual population of neoplastic ganglionic and glial components

 [Journal of Histopathology and Cytopathology, 2017 Jul; 1 (2):120-123]

 Key words: Ganlioglioma, Sellar-suprasellar tumor.

 

  1. *Dr. Naila Huq, Assistant Professor, Department of Neuropathology, National Institute of Neurosciences & Hospital, Sher-E-Bangla Nagar, Agargaon, Dhaka. nailahuqpopy@gmail.com
  2. Most. Israt Jahan, Medical Officer,  Department of Neuropathology,  National Institute of Neurosciences & Hospital, Sher-E-Bangla Nagar, Agargaon, Dhaka.
  3. Proessor Dr. Md. Nowfel Islam, Professor & Head,  Department of Neuropathology, National Institute of Neurosciences & Hospital, Sher-E-Bangla Nagar, Agargaon, Dhaka.
  4. Professor Dr. SK. Sader Hossain, Professor & Head, Department of Neurosurgery, National Institute of Neurosciences & Hospital, Sher-E-Bangla Nagar, Agargaon, Dhaka.
  5. Professor Dr. Mohammed Kamal, Professor, Department of Pathology, Bangabandhu Sheikh Mujib Medical University, Shahbag, Dhaka.

 

*For correspondence

Introduction

Gangliogliomas are rare central nervous system tumors composed of intimately admixed neuronal and glial components. Their incidences range from 5-8% of all brain tumors, but they are more common in the pediatric age group.1,2 Seizures are the commonest presentation reflecting involvement of temporal lobes commonly, but they can involve any part of the neuraxis including spinal cord.2 Sellar or suprasellar gangliogliomas are very rare. We report a case of suprasellar Ganglioglioma with histopathological and MRI features. This case suggests that though Ganglioglioma is rare but can occur in this location.

 Case Report

A twenty two years old female was admitted in the department of Neurosurgery of National Institute of Neurosciences and Hospital (NINS & H) with the complains of severe headache and vomiting for 25 days. She had history of loss of consciousness and convulsion and difficulty in walking associated with generalized weakness. She also complained of blurring of vision. On examination her Glasgo Comma Scale was 15/15. Higher psychic function and speech were normal. There was no sign of meningeal irritation. Bilateral blurring of vision was present.

Her Magnetic Resonance Imaging (MRI) revealed a fairly large, lobulated extra axial lesion of (3.22 x 2.34) cm with signal intensity change, in the suprasellar and right parasellar region. It was iso to hypo-intense on T1 and mildly hyperintese on T2. Post contrast scan revealed intense enhancememt of the lesion. It extends upwards through the floor of the third ventricle causing ventricular obstruction (Fig.1 and 2). Radiology suggested the lesion as a suprasellar meningioma. All the pituitary hormone levels were within the normal limit. A clinical diagnosis of craniopharyngioma was made.

The patient had a left sided V-P shunt (Fig.3) inserted two months back to releif hydrocephalus at an outside hospital. Her previous ultrasonogram (USG) report of whole abdomen was normal. Recent USG showed a large thin walled cystic lesion in left lobe of liver suggesting CSFoma. Lower end of VP shunt tube was within the lesion. She was anaemic and had high ESR. Her serum amylase level was within normal limit and gastric biopsy revealed features of chronic gastritis.

The patient underwent right frontal craniotomy with subtotal removal of the tumor. The tumor was encapsulated, lobulated, firm, gritty and haemorrhagic. Peroperative findings suggested it to be a suprasellar meningioma. Part of the specimen was sent for routine histopathological examination.

Microscopic examination of the tumor showed collections of large ganglion cells with prominent nucleoli, abundant cytoplasm admixed with glial component. The glial component was mostly pilocytic in nature with some astrocytes in a fibrillary background. No evidence of meningioma or craniopharyngioma  was seen. Finally it was diagnosed as Ganglioglioma, WHO grade I/IV.

After 18 days of surgery, the patient became quite healthy and symptom free. Her vision improved. She got discharged from hospital with almost full recovery.

 

 

 

 

 

 

 

 

Fig.1. MRI of brain showing sellar tumor

 

 

 

 

 

 

 

Fig.2. MRI of brain showing sellar contrast enhancing tumor and dilated lateral ventricles.

 

 

 

 

 

 

 

Fig.3. X-ray showing V-P shunt in situ

 

 

 

 

 

 

Fig.4. Photomicrograph of sellar tumor showing neoplastic glia (A) and  ganglionic cells (B)     (H & E, x120)

 

 

 

 

 

 

Fig.5. Photomicrograph of sellar tumor showing large neoplastic ganglionic cells (H & E, x400)

 

Discussion

Temporal lobes are the commonest location for supratentorial gangliogliomas, but they can also arise from frontal, parietal and occipital region, and rarer sites include the cerebellum and brainstem. Sellar and suprasellar gangliogliomas are very rare and a few cases have been reported.2,3,4,5

The differential diagnoses of suprasellar lesions in children include neoplastic conditions like hypothalamic glioma, craniopharyngioma, germ cell tumors and pituitary adenomas; or non-neoplastic conditions such as granulomatous diseases and benign cyst. The most common lesions in adults are meningioma and pituitary adenoma3,4 . Our case was also diagnosed radiologically as meningioma due to suprasellar location. All the pituitary hormone levels were done to exclude the possibility of pituitary adenoma. The hormone levels were within the normal limit and finally preoperative diagnosis was Craniopharyngioma, which is a common tumor in this location.

The radiographic appearance of gangliogliomas is variable, but certain characteristics prevail. It may be solid or cystic. The cystic appearance varies from a single large cyst with a mural nodule to a multicystic mass. Imaging studies reveal a well-circumscribed lesion situated in the peripheral cortex. On MRI, it is iso-to-hypointense on T1 weighted images, hyperintense on T2 weighted and FLAIR images and shows variable contrast enhancement either a nodular rim or a solid pattern. Calcification is common. The cyst margins can enhance, mimicking the ring enhancement of malignant glioma.3,4,6 The present case has similar radiological findings, but calcification and cyst formation are absent.

The pathologic criteria of ganglioglioma includes irregular groups of large, dysplastic, multipolar neurons admixed with glial component surrounded by a reticulin network. The glial component is generally pilocytic or fibrillary, but ependymal and even oligodendroglial components have been described. Eosinophilic granular bodies, hyaline bodies, microcystic changes, calcification, desmoplasia and perivascular lymphocyte infiltration may be present variably.2,8

The case under discussion presented with a suprasellar lesion having complains of headache, bilateral blurring of vision and history of convulsion. 15-25% patient of ganglioglioma undergoing surgery usually presents with a history of seizure7. Histopathology of our case showed  combination of both neuronal and glial cell elements. The ganglion cells were large having vesicular nuclei, prominent nucleoli and abundant cytoplasm arranged in sheets and groups. The glial elements showed mostly pilocytes, scattered astrocytes and occasional foci of reticulin formation in a fibrillary background. Immunohistochemistry for CD34 antigen expressed in neuronal cells in 70-80% of gangliogliomas7. But as this case showed very typical and prominent ganglion cell component in a large area of the tumor, immunohistochemical analysis was not necessary. Jalali R et al., Siddique K et al., Shuangshoti S et al. also found ganglioglioma in sellar-suprasellar location which were radiologically diagnosed  as other common entities of this site.3,4,5

Conclusion

Gangliogliomas are mostly benign tumors with good prognosis. A complete surgical resection is necessary for recurrence free survival of the patient. But in most of the cases the sellar gangliogliomas are misdiagnosed both clinically and radiologically. A well-demarcated lesion with signal intensity changes in the sellar-suprasellar region should alert the clinician in considering gangliglioma as a possible differential diagnosis, which will help in proper surgical management of the patient.

 References

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  2. Zentner J, Wolf HK, Ostertun B, Hufnagel A, Campos MG, Solymosi L, et al. Gangliogliomas: clinical, radiological, and histopathological findings in 51 patients. J Neurol Neurosurg Psychiatry, 1994; 57:1497-502.
  3. Jalali R, Deopujari CE, Bhutani R, Suhas U, Rajasekharan P, Kane SV, Gupta T. Suprasellar ganglioglioma with unusual diffuse involvement of the entire optico-chiasmal hypothalamic pathway. J Cancer Res Ther,2008 Jul-Sep; 4(3):140-3.
  4. Shuangshoti S, Kirsch E, Bannan P, Fabian VA. American J of Neuroradiology, 2000 Sep; 21(8):1486-1489.
  5. Siddique K, Zagardo M, Gujrati M, Olivero W. Ganglioglioma presenting as a meningioma: case report and review of the literature. Neurosurgery, 2002 May;50(5):1133-5.
  6. Burger PC and Scheithauer BW, Tumours of the central nervous system. In: Rosai J, ed. Atlas of Tumor Pathology, 3rd series, Fascicle 10. Armed Forces Institute of Pathology, Washington DC. 1994: pp.163-172.
  7. Louis DN, Ohgaki H, Wiestler OD, Cavenee WK, Neuronal and mixed neuronal-glial tumours. In: WHO Classification of Tumors of the Central Nervous System. 4th Ed, International Agency for Research on Cancer, Lyon, 2007 pp.103-105.
  8. Rosenblum MK. Central nervous system. In: Rosai J. Ed. Rosai and Ackerman`s Surgical Pathology 10th. St Louis, Mo. Elsevier. 2010. vol-2, pp 2366-2369.

 

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