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Surgical Strategy in Case with Co-Existence of Malignant Oligodendroglioma and Arteriovenous Malformation: a Case Report

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Surgical Strategy in Case with Co-Existence of Malignant Oligodendroglioma and Arteriovenous Malformation: a Case Report Vol.2, No.8, 473-478 (2013) Case Reports in Clinical Medicine http://dx.doi.org/10.4236/crcm.2013.28125 Surgical strategy in case with co-existence of malignant oligodendroglioma and arteriovenous malformation: A case report Hirohito Yano1*, Noriyuki Nakayama1, Naoyuki Ohe1, Toshinori Takagi1, Jun Shinoda2, Toru Iwama1 1Department of Neurosurgery, Gifu University Graduate School of Medicine, Gifu, Japan; *Corresponding Author: [email protected] 2Chubu Medical Center for Prolonged Traumatic Brain Dysfunction, Department of Neurosurgery, Kizawa Memorial Hospital, Minokamo, Japan Received 26 September 2013; revised 20 October 2013; accepted 3 November 2013 Copyright © 2013 Hirohito Yano et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT with complaints of headache and vomiting. Her level of consciousness was normal and she had no neurologic A brain tumor associated with an arteriovenous deficits. Magnetic resonance images (MRI) on admission malformation (AVM) is very rare. A 42-year-old revealed a 7 cm in diameter mass lesion that showed low female presented with two separate lesions in signal intensity on the T1 weighted images (WI) and her right frontal lobe on MRI. An angiogram di- high signal intensity on the T2 WI in the right frontal agnosed one of the lesions as an AVM. The lobe. The lesion demonstrated heterogeneous enhance- second lesion appeared to be a tumor. Tumor ment by gadolinium-diethylenetriamine penta-acetic removal was difficult due to bleeding from the acid (Gd-DTPA) adjacent to the Rolandic vein (Figure nearby AVM, necessitating removal of the AVM 1(A)). The T2 WI also demonstrated a second 3 cm in and allowing complete excision of the tumor. diameter lesion with multiple flow void signs in the right Histopathological analysis revealed the tumor inferior frontal gyrus (Figure 1(B)). An angiogram was an anaplastic oligodendroglioma. There was showed an arteriovenous malformation (AVM) that was no recurrence of the tumor 5 year after comple- predominantly fed by the middle cerebral arteries and tion of therapy. We discuss the operative strat- drained through the superficial frontal ascending vein egy in case of synchronous diseases and pro- and the Rolandic vein (Figures 1(C) and (D)). vide a review of the literature. Spetzler-Martin Grade was 1 point. The angiogram also demonstrated an avascular region in the area of the for- Keywords: Oligodendroglioma; Arteriovenous mer lesion. A plain computed tomography scan showed Malformation; Co-Existence partial calcification, and a dynamic study of the me- thionine positron emission tomography (PET) scan pre- 1. INTRODUCTION sented a reduction of accumulation in the longitudinal course in the former lesion. The results of dynamic PET The association of a brain tumor and an arteriovenous study indicated oligodendroglial tumor according to our malformation (AVM) is rare. While there have been a study previously reported [1]. Comprehensively, these number of reports, few of these have reported the details radiological findings led to a diagnosis of malignant oli- of the operative strategy, particularly the approaches used godendroglial tumor associated with AVM. The patient’s based on the preoperative information of both lesions. headache was likely caused by the large tumor, and so We describe our chosen surgical strategy in a case with we planed to resect the oligodendroglioma first, followed two such synchronous lesions and provide a review of by the AVM. For the operation, we performed a large the literature. osteoplastic frontotemporal craniotomy beyond the 2. CASE REPORT mid-line including both lesions, with the goal being to remove the oligodendroglioma and AVM consecutively. A 42-year-old previously healthy female presented During this procedure, severe bleeding occurred from the Copyright © 2013 SciRes. OPEN ACCESS 474 H. Yano et al. / Case Reports in Clinical Medicine 2 (2013) 473-478 Figure 2. (A)-(E) Intraoperative photographs. (A) The exposed Figure 1. (A) MRI with gadolinium showing a heterogeneously tumor in the right frontal lobe (asterisks) and the AVM (arrow). enhancing mass lesion with partial cyst in the right frontal lobe. B: The dilated red vein penetrating the tumor from the AVM. C: (B) The T2 weighted image showing crowded flow void signs The cortical red vein of the AVM. (D) The nidus (arrow) was that suggest an arterio-venous malformation in the right inferior sharply dissected and the final draining vein was cut. (E) Intra- frontal gyrus. (C), (D) The right common carotid angiogram (C: tumoral vein alerted the diameter to the usual (arrow). Intra- frontal view, D: lateral view) showing a nidus fed by middle tumoral bleeding became controllable. (F) Photomicrograph of cerebral artery and mainly draining to the Rolandic vein, and hematoxylin & eosin stained slide showing honeycomb ap- the anterior frontal ascending vein. The tumor area in front of pearance with mild nuclear atypia and a few mitoses (arrow), Rolandic vein shows no tumor shadows. which suggests anaplastic oligodendroglioma (×400). venous sac protruding beside the superior sagittal sinus. The above-mentioned venous sac shriveled. We com- After hemostasis was achieved and a dural incision was pleted removal of the anterior half of the tumor. The tu- made, both lesions were exposed on the surface of the mor was completely removed using fluorescent naviga- right frontal lobe (Figure 2(A)). We administered fluo- tion. The intra-operative motor evoked potential exami- rescein sodium to discriminate the tumor from the nor- nation also presented a good response of her forelimb mal brain tissue by the previously reported method [2]. after removal of the tumor. Postoperatively, the patient’s The tumor stained deep yellow and was sharply circum- level of consciousness was clear and she had no neuro- scribed. We first separated the tumor from the Rolandic logical deficits. vein and precentral gyrus. As we proceeded into the deep white matter, however, the tumor’s borders became more 3. PATHOLOGICAL EXAMINATION ill-defined. We encountered active bleeding as we re- Formalin-fixed, paraffin-embedded tissue sections moved the rear half of the tumor, the source of which were used for hematoxylin-eosin (H & E) staining and proved to be a dilated vein penetrating the tumor from immunohistochemistry. H & E staining revealed a sheet- the AVM (Figure 2(B)). As we found it difficult to con- like honeycomb appearance with high cellularity, ne- trol the bleeding, we focused on removing the AVM. The crotic foci and nuclear atypia. Mitoses were frequently nidus was sharply dissected from the cortex, and the observed (Figure 2(F)). MIB-1 labeling index was 25%. feeders were coagulated and cut (Figures 2(C) and (D)). These findings led to a diagnosis as anaplastic oligoden- At the final stage, the draining veins including Rolandic droglioma. The vascular lesion was diagnosed as an vein, frontal ascending vein and deep veins were treated. AVM, and demonstrated numerous dilated vessels of The vein within the tumor then altered in diameter to a various sizes. much more normal size (Figure 2(E)). The AVM was Following surgery, the patient received external beam completely and safely resected. The resection of the radiation therapy with concomitant Temozolomide (TMZ: AVM provided palliation of bleeding from the tumor. 75 mg/kg/day). TMZ, however, had to be discontinued Copyright © 2013 SciRes. OPEN ACCESS H. Yano et al. / Case Reports in Clinical Medicine 2 (2013) 473-478 475 due to pancytopenia a few weeks later. Sixty gray of ra- ciation with AVM include hemangioblastoma [5], he- diation therapy produced a satisfactory result. Both le- mangiopericytoma [22], ganglioneuroma, [23] subepen- sions completely disappeared and there was no recur- dymal giant astrocytomas [29], and craniopharyngioma rence of the tumor 5 year after completion of therapy. [14]. In the remaining 2 cases, histology was simply de- scribed as glioma [27,37]. In the present case, the histol- 4. DISCUSSION ogy was that of an anaplastic oligodendroglioma, which There have been 74 reported cases of brain tumors as- is the type of tumor most frequently associated with sociated with AVM to the best of our knowledge (Table AV M. 1) [3-40]. The rate of this rare association was reported Concerning the positional relation between the tumor to be 0.1% [19]. There is a male predominance (male: 47 and the AVM, the two lesions were considered “separate” cases, female: 27 cases). The ages ranged from 0 to 70 in 18 cases, “intermixed” in 39 cases and “adjacent” in years of age; the median age was 28.5. The age of onset 17 cases (Table 1). In our case, it appeared that the tumor was unlikely to be related to the association of brain tu- had occurred in contiguity with a congenital AVM in the mor and AVM, and seemed more likely to depend on the nearby region of the same lobe. Accordingly, the rela- kind of brain tumor involved. There are several hypothe- tionship was judged as “separate”. There have been only ses about the etiology and timing of the development of a handful of cases in which both the AVM and the brain the two lesions in terms of which occurs first and tumor were preoperatively diagnosed using angiography whether one lesion causes the other [26]. Environmental and MRI [29,31-34]. In some reported cases with inter- factors and viruses have also been speculated as triggers mixed AVM in the brain tumor, vascular components [26]. were pathologically diagnosed after the surgery. Those Concerning the histology of the brain tumors involved were diagnosed as “angioglioma”. In such a case, exten- in these cases, there were 12 cases of pilocytic astrocy- sive bleeding during surgery would be assumed; however, toma [27,40], 10 of astrocytoma [3,6,8,15,29,30,33,35, the reports make little mention of the operative approach.
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