INTRODUCTION

Meningiomas are one of the largest groups of brain tumors. They come in two forms:intracranial and extracranial. The extracranial location is very rare. Approximately 6%-17% of all meningiomas can be found in extracranial regions[1]. Male patients are more likely to have extracranial meningiomas[2]. We describe a rare case of primary extracranial meningioma of the maxillary sinus in a 54-year-old female patient presenting as buccal swelling and headache. Regardless of the grade, the recommended treatment is complete surgical excision if possible; we used a combined surgical approach to achieve complete excision of the lesion. The clinical, histological and immunohistochemical features are described. The possible histogenesis and the differential diagnosis are also discussed. Subsequently, we reviewed the literature on this respect.

CASE PRESENTATION

Chief complaints

A 54-year-old female patient presented with right buccal swelling for 2 years and headache for 2 mo to the Department of Head and Neck Oncology Surgery, West China College of Stomatology, Sichuan University.

History of present illness

The patient visited a local hospital and started anti-inflammatory and analgesic drugs as they considered the symptoms to be caused by cold and toothache, but the pain did not improve significantly. The patient again visited Guangyuan People’s Hospital seeking further treatment. The biopsy taken showed the spindle cell tumor in the right maxillary sinus, which was further examined by immunohistochemistry. The patient denied any shortness of breath, nausea, dysphagia, hoarseness, loss of consciousness and any neurological or constitutional symptoms at any time.

History of past illness

The patient had no previous medical history.

Personal and family history

She was a non-smoker with no specific family history.

Physical examination

On extra-oral examination the mass located in the right face was non-tender, fixed and non-pulsatile and sessile (Figure 1A). The patient did not have any palpable lymph nodes or associated neck masses. Upon intra-oral examination, an obvious buccal swelling covered with slightly red oral mucosa was present. The majority of the mass was located in the right maxillary sinus and involved the base of the maxilla.

Laboratory examinations

The patient underwent biopsy of the mass using gingival incision extending as far as the upper first molar teeth under local anesthesia. Biopsy reported a grade I primary extracranial meningioma with low mitotic activity. Hematological examinations were within normal limits.

Imaging examinations

March 31, 2021

On June 6, 2016, under general anesthesia “extended resection of right maxillary meningioma; right maxillary extended resection; inferior turbinate partial resection;middle turbinate partial resection; right-sided canal neurotomy; right trigeminal peripheral branch transection; A1 extraction; A1-A7 gingival flap; and free skin patch repair” was performed.

Computed tomography (CT) demonstrated the presence of a large, well-defined soft tissue mass measuring about 7 cm × 6 cm × 6 cm occupying the entirety of the right maxillary sinus, affecting nearby sphenoid and ethmoid sinuses, without affecting the dura mater or endocrinal structures. The surrounding structures were compressed by the mass, and the mass extended from the roof of the oral cavity into the skull base. CT on bone window setting showed an expansive mass with a high density area in the right maxillary sinus. The anterior and lateral walls of the maxillary sinus were thinned and destructed by the expanding mass, with erosion of the wall of the right maxillary sinus as well as orbital floor. (Figure 1D and E). Imaging study based on comprehensive detection of the lesion revealed that there was no evidence of intracranial extension and metastatic nests.

FINAL DIAGNOSIS

Grade D (Fair): 0

TREATMENT

As intracranial invasive meningioma was excluded, the surgery was decided to be performed by the Oral and Maxillofacial Surgeons. Total maxillectomy together with the excision of the tumor and the adjacent paranasal structures, following reconstruction of the orbit and maxilla with tissue patch was performed.

2）引入第三方評價機(jī)構(gòu)。為提高中醫(yī)類專業(yè)實踐教學(xué)評價效能，避免高校在實踐教學(xué)評價體系中既是運(yùn)動員又是裁判員的尷尬，結(jié)合當(dāng)前教育評價環(huán)境，綜合來看，引入社會第三方教育評價機(jī)構(gòu)是目前更加科學(xué)合理的評價機(jī)制。由高校制定好相關(guān)評價標(biāo)準(zhǔn)和制度，第三方教育評價機(jī)構(gòu)負(fù)責(zé)組織實施，雙方各司其職，共同促進(jìn)教學(xué)評價工作朝健康、良性的方向持續(xù)發(fā)展[3]。

（三）缺乏責(zé)任感。做作業(yè)沒有明確的意識，不能正確的解讀文本材料。對作業(yè)練習(xí)等應(yīng)付了事。不重視考試，缺乏競爭意識。抱著我反正不會做，可有可無的態(tài)度參加考試，考后更不注意總結(jié)反思。久而久之，造成誤差積累，使學(xué)習(xí)更加困難，喪失學(xué)習(xí)信心。

Frozen pathology showed spindle cell tumor with extensive necrosis in the right maxilla, which was confirmed by extensive biopsy and immunohistochemical staining.The operation lasted for 2 h and 5 min. The blood loss was 650 mL, and the fluid infused was 2600 mL during the operation. After the operation, the patient returned to the intensive care unit. The vital signs of the patient were observed. Ceftriaxone 2.0g IV BD for 4 d was used to treat infection and prevent intracranial infection.Postoperative nutritional support and antitumor therapy were used.

Meningiomas can exist as intracranial or extracranial brain tumors and are benign,slow-growing tumors. The extracranial location accounts for 2% of all these tumors[3]and found most often in male patients and in young individuals[4]. Due to their unusual symptoms and lack of prevalence, primary extracranial meningiomas are often misdiagnosed[5]. Fortunately, 80% of extracranial tumors are benign[6]. Cases of extracranial meningioma of the sinonasal tract[7], retromolar area[8], eyebrows[9],pelvis[10],have also been reported. Some of the published reports of extracranial meningiomas are listed in Table 1. Histologically, primary extracranial meningiomas do not differ from intracranial, and most of these tumors are sporadic with unclearetiology[11]. Primary extracranial meningiomas have been considered as arising independently from cranial nerve sheaths or from extracranial embryonic rests of arachnoid cells and as extracranial metastases of a primary intracranial meningioma,but their origin has not been completely established[12].

Immunohistochemically, the tumor cells were strongly positive for vimentin(Figure 3A), focally positive for epithelial membrane antigen (Figure 3B) and CD99(Figure 3C). The cells showed negative staining for signal transducer and activator of transcription 6 (Figure 3D) and CD34 (Figure 3E). The MIB-1 (Ki-67) labeling index was 15% (Figure 3F),focally positive.

OUTCOME AND FOLLOW-UP

The patient was discharged with the following advice: perform mouth opening exercises; fabricate lumbar appendage in Prosthodontic Department a month later;radiotherapy should be done; proper nutritional support, proper oral hygiene and proper wound care; avoid spicy, acidic and irritating foods; and review after discharge for 1 mo and follow-up for discomfort.

揚(yáng)中市位于鎮(zhèn)江市東部江心，黃金水道——長江中下游，蘇南現(xiàn)代化建設(shè)示范區(qū)內(nèi)，是由太平洲、中心沙、雷公島、西沙島組成的城市。其東北與泰州、揚(yáng)州隔江相望，西南與鎮(zhèn)江、常州一衣帶水，南橋與滬寧高速公路和京滬鐵路相接，北渡可聯(lián)京滬高速公路。其距上海浦東國際機(jī)場與南京祿口國際機(jī)場分別為2.5小時和1.5小時車程。

對兩種不同頻率激勵下的柴油油樣分別進(jìn)行3次試驗求其平均值，然后對比采用標(biāo)準(zhǔn)方法的檢測值，求取兩者的差值。柴油凝點(diǎn)檢測結(jié)果見表2。

DISCUSSION

The entire tumor specimen was submitted for histology, and fresh tissue was fixed in formaldehyde solution for ultrastructural analysis. Histologically, the specimen consisted of epithelioid lobulated tissue, separated by abundant collagen fibers(Figure 2A and B). Image analysis at high magnification showed a thick fibrous capsule and was composed of interwoven fascicles of spindle-shaped meningiocytes and collagen fibers that were arranged into lobules. The tumor cells had abundant cytoplasm and indistinct cytoplasmic borders, arranged in whorled and lobulated patterns. There was osteoid formation in the tumor. No cytologic atypia or necrosis were discovered, but some mitoses were present. The specimen showed abundant cytoplasm and indistinct cytoplasmic borders, arranged in whorled and lobulated patterns (Figure 2C and D). Based on the hematoxylin and eosin sections, the lesion was diagnosed as a fibrous meningioma.

The present case shows the clinical and imaging aspects of extracranial meningioma of the maxillary sinus in an elderly lady. Primary extracranial meningioma of the paranasal sinuses is rare[13]. In general, the most common signs and symptoms of paranasal sinus meningiomas may mimic cases of sinusitis with nasal obstruction,anosmia, facial pressure or pain, epistaxis and rhinorrhea[14,15]. Meningiomas in the extracranial space often present with nonspecific symptoms until the tumor has reached a significant size. This was the case with our patient who had buccal swelling for 2 years, which has been neglected by the patient until the headache started. Clinical examination should be comprehensive because more than 10% of cases may remain asymptomatic even in advanced stages[15]. Imaging studies, especially CT and magnetic resonance imaging scans, have proved to be useful in the diagnosis and management of meningiomas. The differential diagnosis should include a variety of benign and malignant neoplasms such as melanoma, olfactory neuroblastoma,carcinoma, hemangioma, sarcoma and aggressive psammomatoid ossifying fibroma[10,14]. Histology is therefore essential, and the general histologic features and immunohistochemically findings can usually differentiate between these tumors, as extracranial meningioma presents with solid nests of meningothelial cells arranged in sheets or whorls with a fibroadipose background[5,13]. Immunohistochemistry is helpful in confirming the diagnosis; extracranial meningiomas tend to show strong positivity towards vimentin and epithelial membrane antigen, as indeed occurred in our patient, and are focally positive for CD99 and Ki-67.

Both CT and magnetic resonance imaging are essential in preoperative surgical planning. Surgery is the only curative treatment, and surgical excision of the mass should be performed if possible. External beam radiation therapy has been shown to be effective and therefore reserved as a palliative approach[16,17]. In the present study, surgical therapy was determined to be the optimal treatment approach for several reasons. The various treatment previously performed on the current patient did not result in an evident recession of the mass. Without surgical intervention, a firm mass and unbearable headache would remain.

CONCLUSION

The present study reports successful surgical treatment of a patient with a rare primary extracranial meningioma in the maxillary sinus. The present study demonstrated that imaging studies can aid in the diagnosis and biopsy and is useful to specify diagnosis. Surgical treatment is a viable option for the successful management of extracranial meningiomas in the maxillary sinus, and complete postoperative care often requires a multidisciplinary approach.

目前，世界各國都深刻意識到低碳經(jīng)濟(jì)是全人類發(fā)展的必然趨勢。對于因二氧化碳等溫室氣體過量排放所導(dǎo)致的氣候變化和能源短缺等一系列問題，都應(yīng)靠發(fā)展低碳經(jīng)濟(jì)作為改善措施。眾所周知，電力行業(yè)作為溫室氣體的主要排放行業(yè)，在我國低碳經(jīng)濟(jì)的大環(huán)境下，扮演著至關(guān)重要的角色。如何切實有效地提升電力企業(yè)會計核算制度，從根本上降低我國的碳排量，是目前每一個電力會計工作者都應(yīng)思考的問題。

The authors thank Dr. Aladimi MT from the West China school of Stomatology,Sichuan University (Chengdu, China) for his kind help in the manuscript preparation and for certain important suggestions for the present manuscript.

李叔和聽到這個消息，有點(diǎn)心驚肉跳。捻船的時候，李老鬼對他說，我早就知道，這個娘們屬是非窩子，我不讓你給她有來往，是看她面相上有殺氣哩，還好，你早給她斷了，這事兒粘不到咱身上。