- Case report
- Open Access
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The glomus tumor resorbed bone and teeth in the mandible: a case report
© The Author(s). 2018
- Received: 19 March 2018
- Accepted: 18 September 2018
- Published: 25 September 2018
A glomus tumor is a rare neoplasm usually found in the dermis or subcutaneous tissue of the extremities. It is rare for the glomus tumor to occur on the head and face. Only 26 glomus tumors of the oral region and affected bone have been reported in the English-language literature (Table 1). We report a case of a glomus tumor at the mandible. As a new point, the glomus tumor resorbed a bone and teeth roots when the tumor progressed into the mandible.
The patient was a 44-year-old Japanese man who complained swelling of the right mandible. Radiographic examination showed a multilocular radiolucency area in the left mandible. Radiographic findings on our case resembled those of a common benign tumor. The lesion occupied to the premolar and molar area and revealed that the tumor resorbed the roots of the teeth. The lesion was removed surgically with the buccal cortical bone and buccal mucosa in contact with the mass of the tumor. The mass fully excised intraorally under general anesthesia, and the inferior alveolar nerve in contact with the mass was preserved.
The specimen was pathologically diagnosed as a glomus tumor. Immunohistochemical staining was positive for vimentin, muscle-specific actin/HHF35, and calponin. A hairline-shaped area of positive staining for type IV collagen surrounding the tumor cells was also observed. In contrast, staining for alpha-SMA, cytokeratin (AE1/AE3), cytokeratin (CAM5.2), CK19, CD31, CD34, CD68, p63, S-100, Factor VIII, and desmin was all negative. The Ki-67 labeling index was almost 1%.
A recurrent tumor was again detected in the site below the primary tumor at an 8-year follow-up, and it was surgically removed. The patient has had no symptoms of recurrence in 2 years after the second operation.
The glomus tumor resorbed a bone and teeth roots when the tumor progressed into the mandible. The immunohistochemical features of the tumor were consistent with those described in previous reports. It is important to completely remove the Glomus tumor.
- Case report
- Glomus tumor
- Resorption of teeth roots
A glomus tumor is a rare neoplasm usually found in the dermis or subcutaneous tissue of the extremities, where it causes localized pain, tenderness, and cold sensitivity . The glomus body is a contractile neuromyoarterial receptor that regulates peripheral blood flow and temperature . Glomus tumors constitute one or more components of the glomus body and are accordingly identified as malformations of the neuromyoarterial system . Glomus tumors with three distinctive cellular appearances have been described . Type I, the mucoid-hyaline type, is characterized by hyalinized connective tissue interspersed with islands of glomus cells. Type II, the type most frequently described as a glomus tumor, consists of solid masses of glomus cells with limited vascular and connective tissue components. Type III, the angiomatous type, is recognized by its abundance of vascular structures. According to the World Health Organization Classification of Tumors, glomus tumor can be divided into 3 subtypes based on the predominance of a cellular component (solid glomus tumor), a smooth muscle component (glomangiomyoma), or a vascular component (glomangioma) .
In this article, we present a case of a glomus tumor of the mandible. Glomus tumors localized in the oral cavity have been reported in only 26 cases in the medical literature, and our case is the first glomus tumor localized in the mandible and affected teeth. The purposes of this article are to present details of this rare glomus tumor of the mandible, describe the pathological features revealed by immunohistochemical study, and review the literature on glomus tumors affecting the oral region.
A 44-year-old Japanese man presented to the Maxillofacial Surgery Clinic at the Tokyo Medical and Dental University, Tokyo, Japan, with reports of a hard mass and dull pain in the left mandible. His medical history was generally unremarkable, though his mandible had been accidentally smashed against his young son’s head at the age of 40. No fracture was detected at the time, and no treatment was received.
Features of glomus tumor affecting the oral cavity as reported in the literature
Von Langer 
Kirschner and Strassburg 
gingiva/ alveolar mucosa
Grande and D’Angelo 
Harris and Griffin 
Sidhu and Subherwal 
Sato et al. 
Tajima et al. 
Saku et al. 
actin(+), smooth muscle myosin(+)
Ficarra et al. 
Moody et al. 
Vimentin(+), factor VIII(−), CD45(−), A-BgA(−), cytokeratin(−)
Stajcic and Bojic 
Tokiwa et al. 
gingiva of mandibular
Geraghty et al. 
alpha actin(−), neuron-specific enolase(−), chromogranin(−), desmin(−)
Kusama et al. 
S-100(+), actin(+), desmin(+), vimentin(+), factor VIII(−)
Sakashita et al. 
Vimentin(+), smooth muscle actin(+), factor VIII(−)
Yu et al. 
left mandibular area, lip, anterior buccal mucosa
smooth muscle actin(+), S-100(−)
Kessaris et al. 
Vimentin(+), smooth muscle actin(+), actin(−), desmin(−), chromogranin(−), neuron-specific enolase(−), epithelial membrane antigen(−), cytokeratin(−), factor VIII(−)
Rallis et al. 
smooth muscle actin(+), muscle specific actin(+), vimentin(+), desmin(−), S-100(−), epithelial membrane antigen(−), neuron-specific enolase(−), AE1/3(−), Leu7(−), CD3,CD31,CD34,CD45,CD20(−), cytokeratin(−)
Quesada R et al. 
Lanza et al. 
Maeda et al. 
Vimentin(+), smooth muscle actin(+), HHF35(+), keratin(−), S-100(−), factor VIII(−), desmin(−)
Boros et al. 
smooth muscle actin(+), muscle specific actin(+), S-100(+), kerarin(−), epithelial membrane antigen(−), CD34(−), CD31(−), chromogranin(−)
Derand III et al. 
pan-cytokeratin(−), vimentin(+), smooth muscle actin(+), S-100, factor VIII(−)
Vimentin(+), muscle specific actin/HHF35(+), calponin(+), typeIV collagen(+), smooth muscle actin(−), cytokeratin(AE1/AE3)(−), cytokeratin(CAM5.2)(−), CK19(−), CD31(−), CD34(−), CD68(−), p63(−), S-100(−), factor VIII(−), desmin(−)
The initial clinical impression was an ameloblastoma, myxoma, keratocystic odontogenic tumor or another tumor type lesion.
The lesion was removed surgically with the buccal cortical bone and buccal mucosa in contact with the mass of the tumor. The mass fully excised intraorally under general anesthesia, and the inferior alveolar nerve in contact with the mass was preserved.
The patient has no symptoms of recurrence as of this writing, 2 years after the second operation, and will be followed for the long term to promptly detect any signs of new tumor growth.
The patient is satisfied that the glomus tumor was regulated without resecting the mandibular region. He is pleased that there was no functional deterioration that he was worried about before treatment and there was no aesthetic damage.
Timeline of patient diagnosis and treatment.
1. 4 years before the first visit, the patient had been smashed against his young son’s head.
2. At first visit, the symptom was slight swelling of the left mandible. There was no disturbance of sensitivity. The examinations were performed with X-lay and CT.
3. First surgery was performed and started clinical follow-up after the surgery.
4. 8 years later from first surgery, the recurrence was found by panoramic radiograph. The examinations were performed with CT and MR.
5. Second surgery was performed, and it was passed 2 years with no recurrence from second surgery.
Masson et al. was the first to describe the histologic features of a glomus tumor in an examination of a tumor arising from the glomus apparatus (glomus body) in 1924 . The glomus cell resembles a modified smooth muscle cell of the normal glomus body in the subcutaneous tissue, where it serves as a specialized form of arteriovenous anastomosis for the control of blood pressure and temperature [6, 7]. The vast majority of glomus tumors occur in the distal extremities, particularly the subungual region, hand, wrist, and foot, but rare cases have been reported in almost every location of the body .
Only 26 glomus tumors of the oral region and affected bone have been reported in the English-language literature. Our case is rare of reported cases of glomus tumor localized at the mandible in the English-language literature and the case involving the mandible and teeth [7–10]. Previous reports suggest a male predilection for glomus tumors in the oral cavity. Lesions reported within the oral cavity have involved the hard palate, upper lip, gingiva, tongue, buccal mucosa, and mandibular area. Yu et al. reported localized multiple glomus tumors of the oral mucosa and face in the left mandibular area, but none affected the mandible and teeth . The intraosseous location of glomus tumor is also rare . In our case, the CT scan findings showed that the glomus tumor occupied the bone-marrow area and resorbed cortical bone of the mandible. We assume that the glomus tumor was localized in the mandible on the grounds of the CT scan findings, but we could not have the histologic findings that showed that the glomus tumor was formed from the tissue of the intraosseous lesion. Most of the intraosseous glomus tumors reported have been located in the medullary space of a terminal phalanx and encased in cortical bone. The other reported lesions have occurred in the middle phalanxes of fingers, in vertebrae, or in long bones .
The glomus tumor in this case was similar to clinical findings with other jaw cysts and benign tumors in mandible. There was no subjective symptom, there was no complain of getting numb at innervated area of inferior alveolar nerve. In the imaging findings, there was no unique findings on the glomus tumor in the mandibular. As a result of the pathological examination, we informed of the glomus tumor.
Glomus tumors are typically treated by surgical excision. While the excision is thought to be curative, the reported incidence of recurrent lesions ranges from 5 to 17% [13, 14]. In a review of recurrent glomus tumors by Gandhi et al., the lesions were often found to be in the same digits as the first excised tumors but at different anatomic locations .
It is important that the lesion was resected firmly in treatment of glomus tumor in mandibular. The glomus tumor remaining causes recurrence is what to learn in previous reports [13, 14] and in this case. We assume that an incomplete excision caused recurrence. A complete resection was difficult in our case. Because the patient strongly hoped to preserve his face appearance and the inferior alveolar nerve. We believe that glomus tumor progression can be controlled even if tumor resection is not a mandible area resection in the clinical course of this case.
Morphologically, the tumor cells tend to surround the capillary vessels and contain eosinophilic cytoplasm with smaller round basophilic nuclei . Histologically, the glomus tumor presents in various patterns . The World Health Organization Classification of Tumors has identified three subtypes of glomus tumor respectively based on the predominance of a vascular component (glomangioma), a smooth muscle component (glomangiomyoma), or a cellular component (solid glomus tumor) [4, 12]. In immunohistochemistry, the glomus tumor is positive for smooth muscle actin, pan-muscle actin, and type IV collagen .
The tumor cells of both the primary and recurrent lesions of our case appeared around the capillary vessels and presented eosinophilic cytoplasm with smaller round basophilic nuclei. Interestingly, this case showed marked myxoid stromal change in contrast to a typical one. Previous studies reported that some glomus tumors showed extensive myxoid stromal degeneration similar to the present case; moreover, they also suggested that marked myxoid stromal change was correlated with co-expression of actin and CD34 in tumor cells [16, 17]. But in our case, tumor cells showed negative expression for CD34. Pabuccuoglu et al. reported that MMP-9, a member of the matrix metalloproteinase family, produced by glomus tumor cells may be responsible for generating myxoid matrix in stroma . Further analysis will be needed to clarify the mechanism of generating myxoid matrix change in glomus tumor.
In immunohistochemical analysis, both the primary and recurrent lesions were positive for type IV collagen, a characteristic component of the glomus tumor. Almost glomus tumors expressed alpha-smooth muscle actin (SMA) . However, Geraghty et al. reported the case of alpha-SMA-negative glomus tumor . They discussed that the negative staining for the marker represent a variation in the staining pattern . The lesions of this case were negative for alpha-SMA and caldesmon but positive for Calponin and HHF35, which is a muscle-actin-specific antibody and stains the epitope common to alpha-skeletal, alpha-cardiac and gamma-smooth muscle actin, and thus consistent with lesions of myogenic character. Previous studies revealed that glomus tumors showed positivity for MSA (HHF35) in 18 out of 19 cases, Calponin in 4 out of 5 cases, and vimentin in 12 out of 12 cases . Collectively, we consider that the tumor cells have myogenic properties, which don not exclude the possibility that this case is glomus tumor even if staining for alpha-SMA and h-caldesmon are not positive.
In the present study, we found that tumor cells were positive for VEGF and D2–40. Honsawek S. et al. reported that VEGF expression was observed in glomus tumor cells in all examined samples (5 out of 5 cases) . VEGF is a well-known angiogenic factor, and its expression in neoplastic cells may contribute to an abundant vascular network within tumor stroma in glomus tumor. Previous studies reported that staining for D2–40 was negative in glomus tumor cells [21, 22]. The significance of D2–40 expression in glomus tumor cells is unclear. None of the pathological findings on the lesion supported a diagnosis of a vasculature tumor, nervous system tumor, odontogenic tumor, salivary tumor, or any epithelial tumor other than a glomus tumor.
Both the primary and recurrent tumors were finally diagnosed as glomus tumors based on morphologic and immunohistochemical findings. The primary tumor site was judged to be the mandible, in the absence of evidence of metastasis from other tumor sites.
In an analysis of 52 cases of atypical and malignant glomus tumors in soft tissue, Folpe et al. reclassified the tumors based on criteria encompassing three new features: deep location, a tumor size larger than 2 cm, and the presence of atypical mitotic figs. . They proposed a classification for glomus tumors with atypical features, subdividing them into four types: malignant glomus tumor, glomus tumor with nuclear atypia only, glomus tumor of uncertain malignant potential, and glomangiomatosis. This classification has since proven useful for the evaluation of atypical and malignant glomus tumors . Atypical and malignant glomus tumors are defined by the following criteria: either 1) a large size (over 20 mm) coupled with deep localization (deep into the muscular fascia), 2) nuclear atypia involving a pleomorphism and prominent nucleoli, or 3) increased mitotic activity (over 5 mitoses / 50 high-power (400 x) fields) and “moderate” to “high” nuclear grade . A “moderate” nuclear grade is characterized by increased nuclear variability and occasional nucleoli, while a “high” nuclear grade is characterized by an enlargement of the nucleus to double or triple the size of a nucleus in an ordinary glomus cell, together with irregular and prominent nucleoli . Malignant glomus tumors have high-level reactivity for MIB-1, p53 , and Bcl-2  in immunohistochemical studies.
The classification for malignant glomus tumors proposed by Folpe et al.  is based on glomus tumors of the soft tissue and cannot be clearly adapted for tumors of other locations. The criterion “deep into the muscular fascia” is especially difficult to apply to evaluations of tumors not in the soft tissue, given the many possible interpretations of “deep location.” Yet, out of a series of 32 gastrointestinal glomus tumors, all deeply located by definition, only 1 metastasized and 19 were larger than 2 cm [29, 30]. On the other hand, 6 out of 9 deeply located peripheral soft-tissue glomus tumors (all larger than 2 cm) metastasized . The same problem has been discussed for glomus tumors of the sella turcica. Overall, there seems to be a marked difference in the frequency of malignant behavior between deep-seated glomus tumors of the peripheral soft tissue and those located in other “deep” regions .
One case reported in the oral region was diagnosed as a malignant glomus tumor of the maxillary gingiva  based on lesional cells with atypical tumor cells and heterotypic mitosis regardless of the lesion location. Some have proposed that primary glomus tumors located in bone are unlikely to become metastatic or malignant . One malignant glomus tumor of the bone has been documented, but the details of the case are difficult to ascertain because the report was published in Chinese .
Recurrent malignant glomus tumors have been reported, but the rate of recurrence and risk of malignancy cannot be clearly deduced from the literature. The malignant potential of the glomus tumor in the mandibular bone was difficult to evaluate in our case.
Most glomus tumors are solitary and small, with diameters ranging from 10 to 15 mm . Our patient’s tumor measured 45 × 30 × 30 mm and occurred in the mandible bone. This lesion met the malignancy criteria for size, but the tumor had low malignant features of low mitotic activity and absence of significant nuclear atypia. And no recurrence of 8 years was the basis for the lesion being benign. The primary lesion was similar to the recurrent in the morphologic and immunohistochemical findings. And there was no finding suspected of malignancy. The prognosis of this case remains unclear. Close follow-up will be essential, as malignant glomus tumors have been reported on rare occasions.
The glomus tumor resorbed a bone and teeth roots when the tumor progressed into the mandible. The immunohistochemical features of the tumor were consistent with those described in previous reports. The glomus tumor recurred at 8 years later in this case. The tumor was controlled for 2 years after resecting it again. It is important to completely remove the Glomus tumor.
The authors would like to thank Dr. Tsuyoshi Ishida from the Department of Pathology and Laboratory Medicine in Kohnodai Hospital at the National Centre for Global Health and Medicine for his kind assistance in revising the pathological diagnosis of this case. The authors are also grateful to Dr. Hiroshi Watanabe from the Department of the Oral and Maxillofacial Radiology, Tokyo Medical and Dental University, for providing useful assistance in revising the radiological diagnosis.
This report did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Availability of data and materials
The data and material supporting the conclusions of this article are included within the article.
KK conceived this report, drafted the article and revising it critically for important intellectual content. YM and SY helped to draft the manuscript. YA drafted the pathological part of the article and revising it. All authors read and approved the final manuscript.
Ethics approval and consent to participate
The presented case report is in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent for participation was obtained from the patient presented. Since no experimentation with human subjects was performed, no review/approval by an ethics board was required.
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