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 »  Introduction
 »  Case report
 »  Discussion
 »  References

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Year : 2002  |  Volume : 50  |  Issue : 4  |  Page : 511-3

Aneurysmal bone cyst of the temporal bone : a case report.


Department of Neurosurgery, S.M.S. Medical College, Jaipur - 302 004, India.

Correspondence Address:
Department of Neurosurgery, S.M.S. Medical College, Jaipur - 302 004, India.

  »  Abstract

Aneurysmal bone cyst in temporal region is rare. It is a benign condition and may extend intracranially. Total surgical removal is recommended, whenever possible in one stage or in multiple stages. Prognosis is excellent and total removal will effect a cure. An unusual case of aneurysmal bone cyst of temporal region is reported.

How to cite this article:
Purohit A, Chopra S, Sinha V D, Dharker S R. Aneurysmal bone cyst of the temporal bone : a case report. Neurol India 2002;50:511


How to cite this URL:
Purohit A, Chopra S, Sinha V D, Dharker S R. Aneurysmal bone cyst of the temporal bone : a case report. Neurol India [serial online] 2002 [cited 2014 Nov 27];50:511. Available from: http://www.neurologyindia.com/text.asp?2002/50/4/511/1324




   »   Introduction Top

Aneurysmal bone cyst is a rare and benign lesion of the skull with obscure pathogenesis.[1] Approximately, 36 to 50% of all aneurysmal bone cysts are found near one end of long bone and 25% involve the vertebrae, hyoid, mandible and odontoid.[2],[3] The reported incidence in the skull is 1% of all aneurysmal bone cysts.[4] Sixty three cases of aneurysmal bone cysts of skull have been reported in the literature, of which 11 were of temporal bone.[5] An unusual case of aneurysmal bone cyst in the left temporal region is reported here.


   »   Case report Top

A 13 year old girl was admitted with gradually increasing painless swelling in the left
temporozygomatic region for last 3 months. She had pain off and on in the swelling for the last one month. There was no history of trauma. On examination there was a non-tender mass, 7x5x3 cm in size, in the left temporozygomatic region; which was firm to hard and fixed to bone with smooth surface. Skin over the swelling was normal. There was no neurological deficit. All routine investigations were within normal limits. X-ray skull revealed a round well defined radioluscent area in the left temporal region with ballooned out distension of periosteum outlined by a paper thin subperiosteal bone. There was also erosion of greater wing of sphenoid [Figure 1a]. CT scan head (plain and enhanced) showed extra axial hetrogeneous mixed density mass in the left temporal region, taking irregular variegated enhancement. The mass showed medial extension compressing left temporal lobe. There was erosion of petrous and sphenoid wing of temporal bone. MRI showed large well defined extra axial mass lesion with heterogeneous signal intensity in the left temporal and infratemporal region on T1 weighted. The mass showed medial extension with compression of temporal lobe. The mass had well defined hypointense capsule [Figure 1b]. On T2WI, the above described lesion showed homogenous increase in signal intensity. A left temporal question mark skin flap was raised with temporalis muscle. The underlined temporal bone was thinned out with erosion of petrous and greater wing of sphenoid. The tumor had well defined capsule and was soft in consistency. Dark coloured blood was aspirated from the cyst. Near total excision of cyst was done. The squamous part of temporal bone was thinned out and temporal dura was adherent to it, which was torn during tumor removal. Dural defect was repaired by pericranial patch. Inferiorly, tumor mass was extending upto the floor of middle cranial fossa and posteriorly to the petrous bone. Near total excision of the tumor was done. Radiotherapy was not given. The patient was symptom free in the post operative period after 7 months of surgery and kept under close follow up.
Histopathological examination showed cavernous spaces filled with blood. The spaces did not show any endothelial lining. Large areas of extravasated blood were seen. The spaces were separated by collagenous tissue containing fibroblasts, focal collections of osteoclastic and intermediate giant cells. Normal bony trabeculae being permeated by the lesion seen in the periphery was suggestive of aneurysmal bone cyst [Figure - 2].


   »   Discussion Top

The incidence of aneurysmal bone cyst in the skull varies from 3 to 6% of all aneurysm bone cysts.[6],[7],[8],[9] They usually present as scalp mass.[6],[7],[10],[11] Occasionally, they may present as intracranial space occupying lesion[12] or cerebral hemorrhage.[13] Age of presentation varies, but they usually present in the second or third decade, with equal sex distribution.[4],[5] In 1942, Jaffe and Lichtenstein[14] introduced the concept of aneurysmal bone cyst as a lesion with characteristic radiological appearance of ballooned out distension of the periosteum, usually outlined by a paper thin subperiosteal bone shell which is overlined by a region of disintegrated cortex. Trauma has been put forward as an important etiological factor.[15],[16] Edling[1] regarded aneurysmal bone cyst as one of the manifestation of solitary dysfibroplasia of bone, suggesting a defect in development of the epiphyseal plate but it does not explain its occurrence in the mature bone. Lichtenstein[2] suggested that it could result from local circulatory disturbance, because of sudden vascular occlusion of venous drainage of that segment of bone or development of an arterio-venous shunt. This results in progressive blood spaces in the medulla, which lead to gradual distension of the bone with atrophy. Jaffe[17] reported that a pre-existing lesion of bone may initiate an osseous A-V fistula.
Aneurysmal bone cyst in coexistence with other lesions of bone have been reported[3],[18],[19] and include unicameral bone cyst, non-ossifying fibroma, gaint cell tumor, chondroblastoma, fibrous dysplasia, osteofibrous dysplasia of campanacci, fibrous histiocytoma osteoblastoma and cartilaginous hematoma of chest wall of infants.
CT scan is superior to plain radiology in defining extent and soft tissue extension of an aneurysmal bone cyst, particularly in the skull. Multiple small fluid levels are important characteristics of aneurysmal bone cyst on CT scan, which represents sedimentation of red blood cells within blood filled cavities.[20] The aneurysmal bone cysts which do not show fluid levels on CT scan are often non-homogeneous and resemble some giant cell tumor,[20] also seen in the present case. MRI also shows fluid levels, particularly in TlWI. Other findings include prolonged relaxation time, complete delineation of the margin of the lesion by a rim of low intensity signal and internal septation creating cystic cavities where wall contains diverticulum like projections.[21] In our case, multiple fluid levels were not seen. Parikh et al[4] also did not find fluid level in their case.
Pathologically, these cysts contain multiple fluid filled cavities separated by multiple septa lined by mutinucleated giant cells. These large spaces filled with blood do not have an endothelial lining, but are rather delimited by cells with the morphology, ultrastructural and immunohistochemical features of fibroblasts, myofibroblasts and histiocytes. Aneurysmal additional feature of a peculiar degenerated calcifying fibromyxoid tissue reported by Rosai.[19] The risk of recurrence is increased with an increase of mitotic figures.[22]
In some cases, surgical biopsy has in itself been curative.[23] Total excision has been recommended as an ideal treatment for aneurysmal cyst of skull.[18] Simple curettage is associated with high recurrence rates varying from 21% to 50%.[13] The tendency for recurrence is related with young age of the patient, size of the lesion, presence of mitosis and incomplete surgical removal. Radiotherapy has been advocated for deeply situated lesions of the base of the skull, dural involvement or where subtotal excision is done but its effect is unclear.[13],[24] The suggested dose ranges from 600 to 3000 rads.[18],[25] Radiotherapy is however contraindicated in the treatment of aneurysmal bone cyst associated with fibrous dysplasia as there are increased chances of malignant transformation.[26]

 

  »   References Top

1.Edling NPG : Is the aneurysmal bone cyst a true pathological entity ? Cancer 1965; 18: 1127-1130.   Back to cited text no. 1    
2.Lichtenstein L : Aneurysmal bone cyst : Observations of fifty cases. J Bone Joint Surg 1957; 39A: 873-882.   Back to cited text no. 2    
3.Tillman BP, Dahlin DC, Lipscomb PR et al : Aneurysmal bone cyst. An analysis of ninety five cases. Mayo Clin Proc 1968; 43: 478-495.   Back to cited text no. 3    
4.Parikh MA, Dave RJ, Patel DD et al : Aneursymal bone cyst of temporal bone. A case report. Neurol India 1996; 44: 131-133.   Back to cited text no. 4    
5.Kumar R, Mukherjee KK : Aneurysmal bone cyst, of the skull : Report of three cases. Br J Neurosurg 1999; 13: 82-84.   Back to cited text no. 5    
6.Bhende YM, Kothare SN : Aneurysmal bone cyst. A case report. Indian Med Gaz 1950; 85: 544-546.   Back to cited text no. 6    
7.Jeremiah BS : Aneurysmal bone cyst of the temporal bone. J International Coll surgery 1965; 43: 179-183.   Back to cited text no. 7    
8.Lichtenstein L : Aneurysmal bone cyst. Further observations. Cancer 1953; 6: 1228-1237.   Back to cited text no. 8    
9.Giovanni L, Maurizio F, Mario S : Angiography and computerized tomography in the diagnosis of aneurysmal bone cyst of the skull, Case report. J Neurosurg 1980; 53: 113-116.   Back to cited text no. 9    
10.Burns-cox CJ, Higgins AT : Aneurysmal bone cyst of the frontal bone. J Bone Joint Surg 1969; 51B: 344-345.   Back to cited text no. 10    
11.Odeku. EL, Mainwaring AR : Unsual aneurysmal bone cyst. A case report. J Neurosurg 1965; 22: 172-176.   Back to cited text no. 11    
12.Costantini FE, Irad G, Benedetti A et al : Aneurysmal bone cyst as an intracranial space occupying lesion. J Neurosurg 1966; 25: 205-207.   Back to cited text no. 12    
13.Keuskamp PA, Horouptian DS, Fein JM : Aneurysmal bone cyst of the temporal bone presenting as a spontaneous intracerebral hemorrhage : Case report. Neurosurgery 1980; 7:166-170.   Back to cited text no. 13    
14.Jaffe HL, Lichtenstein L : Solitary unicameral bone cyst with emphasis on the roentgen picture, the pathologic appearance and the pathogenesis. Arch Surg 1942; 44: 1004-1025.   Back to cited text no. 14    
15.Barnes R : Aneurysmal bone cyst. J Bone Joint Surg 1956; 38B: 301-311.   Back to cited text no. 15    
16.Thompson PC : Subperiosteal gaint cell tumor ossifying subperiosteal hematoma aneurysmal bone cyst J Bone Joint Surg 1954; 36A: 281-306.   Back to cited text no. 16    
17.Jaffe HL : Discussion following a paper by W.F. Donaldson Jr. : Aneurysmal bone cyst. J Bone Joint Surg 1962; 44A: 25-40.   Back to cited text no. 17    
18.Biesecker JL, Marcove RC, Huvos AC et al : Aneursymal bone cysts. A clinicopathologic study of 66 cases. Cancer 1970; 26: 615-625.   Back to cited text no. 18    
19.Rosai J : Ackerman's surgical pathology, CV Mosby Co. London. 1989.   Back to cited text no. 19    
20.Hudson TM : Fluid levels in aneurysmal bone cyst : A CT feature. Am J Radiol 1984; 142: 1001-1004 .   Back to cited text no. 20    
21.Javier B, Donald CS, Micheal L : Aneurysmal bone cyst : MR imaging at 1.5 T. Radiology 1986; 158: 689-690.   Back to cited text no. 21    
22.Ruiter DJ , Van Rijssel TG, Van Der Velde EA : Aneurysmal bone cysts : A clinicopathological study of 105 cases. Cancer 1977 ; 39: 2331-2339.   Back to cited text no. 22    
23.Wilner D : Radiology of bone tumors and allied disorders. Philadelphia : WB Saunders 1982; 1003-1103.   Back to cited text no. 23    
24.Probost C : Clivus C2 aneurysmal bone cyst. Contribution to problem of surgical treatment, radiotherapy and individually determined growth trends. Neurochiruegie 1990; 33: 195.   Back to cited text no. 24    
25.El Deeb M, Sedano HO, Waite DE : Aneurysmal bone cyst of the jaw. Report of a case associated with fibrous dysplasia and review of the literature. Int J Oral Surgery 1980; 9: 301-311.   Back to cited text no. 25    
26.Charles L, Challa VR, David LK Jr : Aneurysmal bone cyst with fibrous dysphasia of parietal bone. J Neurosurg 1986; 64: 331-335.   Back to cited text no. 26    

 

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