- Case report
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Idiopathic and radiation-induced myxofibrosarcoma in the head and neck—case report and literature review
Chinese Neurosurgical Journal volume 7, Article number: 48 (2021)
Myxofibrosarcoma (MFS), especially radiation-Induced MFS (RIMFS) in the head and neck, is an extremely rare malignant fibroblastic tumor. The diagnosis and treatment of MFS remain great challenges. In the present study, we presented one case of RIMFS. Combined with previous literature, the clinical features, essentials of diagnosis, and treatment modalities of MFS in the head and neck were reviewed to better understand this rare entity.
We reported a case of RIMFS under the left occipital scalp in a 20-year-old girl with a history of medulloblastoma surgery and radiotherapy in 2006. A total tumor resection was performed with preservation of the overlying scalp the underlying bone, and no adjuvant therapy was administered after the first operation. The postoperative pathological diagnosis was high-grade MFS. The tumor relapsed 6 months later, and then, a planned extensive resection with negative surgical margins was carried out, followed by radiotherapy. No relapse occurred in a 12-month postoperative follow-up.
Planned gross total resection (GTR) with negative margins is the reasonable choice and footstone of other treatments for MFS. Ill-defined infiltrated borders and the complicated structures make it a great trouble to achieve total resection of MFS in the head and neck, so adjuvant radiotherapy and chemotherapy seem more necessary for these lesions.
Myxofibrosarcoma (MFS) is a rare soft tissue sarcoma that can arise sporadically or be induced by radiation, representing approximately 5% of all sarcomas. MFS is one of the common soft tissue tumors in the extremities of elderly patients, which also occurs in the trunk (12%), retroperitoneum, or mediastinum (8%) . In contrast, MFS, especially radiation-induced MFS (RIMFS) in the head and neck, is extremely rare.
MFS normally manifests as a painless and slow-growing dermal or subcutaneous mass. Clinically, it is characterized by tumor progression with increased metastasis rate after local recurrence [2, 3]. MRI is the most common pre-operative diagnostic modality. Histological grading of primary MFS is determined according to the updated French Federation of Cancer Centers (FNCLCC) scheme . Due to the high rate of recurrence, planned gross total resection (GTR) with clear margins is essential and adjuvant treatment involving radiotherapy and chemotherapy is advised. However, due to ill-defined infiltrated borders and complex anatomical structures in the head and neck region, it is technically harder to achieve gross total resection . Therefore, radiotherapy as well as chemotherapy looks more necessary for MFS in the head and neck than in the extremity.
To the best of our knowledge, only 28 cases have been reported in the head and neck so far, and 3 of them were induced by radiation (Table 1) [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]. Our case is the first case of scalp MFS following radiation exposure in a young female. Given its relatively recent recognition and the low incidence, only a single case or very small series have been reported, there are no randomized trials to guide treatment protocols. Without standard treatment protocol, it appears challenging to precisely predict prognosis for primary MFS by evaluating clinicopathological factors. Herein, we reported a case of radiation-induced scalp MFS in a 20-year-old girl with a history of medulloblastoma surgery and radiotherapy in 2006. Based on case report and literature review, we discussed clinical and histopathological features, treatment strategies, and prognostic factors of MFS in the head and neck, in order to contribute to a better understanding of this potentially fatal malignancy.
In August 2016, a 20-year-old Chinese girl presented to our hospital with a 4-month history of finding a rapidly progressive palpable scalp swelling. Ten years ago, she was diagnosed with medulloblastoma in the fourth ventricle without leptomeningeal dissemination. Histopathologic examination revealed a classic type (WHO grade IV). Then, she received V-P shunt and surgical resection, as well as adjuvant concurrent chemoradiation (craniospinal irradiation 23.4 Gy, posterior fossa irradiation 55 Gy, and adjuvant chemotherapy).
Physical examination revealed that the lesion was under the left occipital scalp beside the up end of the incision, painless, firm in consistency, and immobile. Neurological examination was unremarkable. On MR imaging, the lesion exhibited a well-demarcated hypointense mass on T1W sequences, slightly hyperintense on T2W sequences, and peripheral enhancement with obvious “tail sigh” on contrast administration (Fig. 1). No biopsy was performed before the first operation. A gross total resection was carried out. Intra-operatively, the tumor was grayish, firm, well-demarcated with insufficient blood supply. The size of the tumor was approximately 35 × 25 cm. The mass was excised with preservation of the overlying scalp and the underlying bone (Fig. 1). Post-operative MRI image showed no residual tumor and no adjuvant therapy was administered. The girl made an uneventful recovery and was discharged on the six post-operative days.
Histopathologic examination showed that the tumor was composed of a myxoid matrix, curvilinear capillaries, and solid sheets of spindled cells, which were arranged in fascicles and sheets with a multinodular growth pattern and were supported by delicate, elongated, and curvilinear vasculature. There were more than 20 mitotic figures per high power field and necrosis was found in many areas. Immunohistochemical staining was positive for vimentin and SMA and negative for S-100, EMA, CD34, and myogenin. The Ki67 index is 50% (Fig. 2). The tumor was diagnosed as a high-grade MFS. Pathology was reviewed by experts in Peking Union Medical College Hospital.
Unfortunately, the tumor recurred in situ 6 months later. But this time, an extensive resection together with the overlying scalp and the underlying bone was performed, followed by cranioplasty and skin flap transplantation. The surgical margin was about 2 cm and was microscopically free of tumor confirmed by intra-operative frozen pathological examination. After surgery, the patient received radiotherapy (total dose, 60 Gy). No relapse occurred in a 12-month postoperative follow-up.
MFS was first described in 1977 , the high-grade end of MFS was considered as a part of the myxoid variant of Malignant fibrous histiocytoma (MFH), while the poorly recognized low-grade variant was construed as a part of the morphological continuum of MFS by Mentzel et al. until the late 1990s . Given the use of modern methods including immunohistochemistry and molecular studies, MFS was proven to be not of true histiocytic origin but of fibroblastic origin and was defined as a distinct type of fibroblastic sarcoma by the WHO in 2002.32
MFS usually develops in proximal extremities of older people with a mean age of 65 years, men are usually affected slightly more often than women . MFS in the head and neck is extremely rare, representing approximately 3% of MFS. To the best of our knowledge, only 28 cases have been reported so far, including brain (5, 17.9%), maxillary sinus (5, 17.9%), scalp (4, 14.2%), orbit (3, 10.7%), hypopharynx (3, 10.7%), sphenoid sinus (2, 7.2%), parotid (2, 7.2%), infratemporal space (2, 7.2%), thyroid gland (1, 3.5%), and multiple lesions (1, 3.5%) (Table 1). The psaranasal sinus appears to be the most frequent site, especially the maxillary sinus, followed by the brain. Similar to MFS in other regions, MFS in the head and neck mainly affects the older male patients (M/F = 19:11). Although the age range is broad, most patients are in their fifth to seventh decades of life, with a mean age of 40.9 years. In contrast, the onset age of RIMFS is associated with the time of receiving radiotherapy.
MFS in the extremities usually presents as a slowly enlarging and painless mass . Due to the complexity of the anatomical structure, MFS in the head and neck illustrates a wide variety of manifestations ranging from an exophytic mass to focal neurological deficiency and symptoms of intracranial hypertension, such as headache and vomiting [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]. In our case, the tumor was a superficial type which presented as a rapidly progressive enlarging and painless mass. Clinically, MFS is characterized by its unusual infiltrative growth pattern, significant propensity for local recurrence, and tumor progression with increased metastasis rate after local recurrence.
Radiation-induced sarcomas (RIS) are increasingly seen in long-term survivors of head and neck tumors, with an estimated risk of up to 0.3%. Common histologic subtypes of RIS parallel their idiopathic counterparts and mainly include osteosarcoma, chondrosarcoma, malignant fibrous histiocytoma, and fibrosarcoma . Radiation-induced MFS is very rare; only 3 cases have been reported until now. The diagnosis of RIS requires the following criteria : (1) history of radiotherapy; (2) asymptomatic latency period of several years (conventionally, > 4 years); (3) occurrence of sarcoma within a previously irradiated field; and (4) histological confirmation of the sarcomatous nature of the post-irradiated lesion. Our case met all the criteria for RIS, including the development of myxofibrosarcoma within the radiation field, a 10-year latent period, and a different histopathological type.
MRI is the most common diagnostic modality for MFS. Computed tomography (CT) is also effective, especially for those located near the air and bone. MFS has a low density on CT, a low-to-intermediate signal on T1-weighted MRI, and a high signal on T2-weighted MRI. MFS often shows abnormal signal infiltration along the facial plan on MRI that corresponds to an infiltrative growth pattern histologically, named “tail sign.” Post-contrast images can better display “tail sign” than T2-weighted images [36, 37]. Thus, in order to define the boundaries of the tumor before operation, high-quality T1- and T2-weighted MRI with pre-and post-gadolinium imaging are necessary. However, due to a lack of typical MRI features, it is a great challenge to differentiate MFS from other tumors especially meningiomas which have iso- to hyperdense on CT, iso- to hypointense on T1 and T2, homogeneous enhancement, and the typical “tail sign.”
The definitive diagnosis of MFS depends on pathological examination. Histologically, a series of general parameters must be present such as spindle-shaped cells, elongated and pleomorphic nuclei, and an abundance of curvilinear vessels with thin walls and a myxoid matrix . Low-grade MFSs are associated with a small amount of cells, a large amount of myxoid tissue, low mitotic activity, and no necrosis, while high-grade MFSs present with a large population of cells, less myxoid matrix, multinucleated giant cells, increased mitotic index, and important areas of necrotic tissue; the intermediate-grade tumors lend particularities of the other two but in a smaller amount, without well-developed solid and necrotic areas or significant pleomorphic cells [38, 39]. Currently, no specific immunohistochemical markers are available to definitely diagnose MFS. However, positive for vimentin, CD-34, and negative for S-100 protein, muscle-specific actin, desmin, and myogenin can support the diagnosis. In addition, Ki-67 reflects the tumor aggression when it is intensely expressed, and high expression of minichromosome maintenance protein 2 may be correlated with a short-term recurrence.39
Like other sarcomas, GTR (including nerves, vessels, and any involved bone) with negative margins remains the primary treatment for MFS . In order to fulfill a total resection, a planned operation based on biopsy and a high-quality MRI imaging is necessary. Biopsy is necessary to orientate the diagnosis or even establish the type of soft tissue sarcoma. Unfortunately, in many cases, the actual tumor boundaries were usually underestimated on MRI due to infiltrative growth along the facial planes. Thus, an extended resection is necessary for these individuals, although the extent of the resection remains controversial, various surgical margins from 1 to 5 cm have been reported previously [40,41,42,43,44,45,46,47,48]. In order to confirm that the surgical margin was microscopically free of tumor, intraoperative frozen section and postoperative histological examination are recommended. Merck et al. reported that the local recurrence rate was up to 33% in MFS patients who undergo primary unplanned resection, in comparison to 17% for primary wide resection because of the unusual infiltrative growth of MFS . However, it is more technically difficult to achieve radical resection in the head and neck region, especially in the deep area. In the reviewed 28 cases, only 7 cases were reported to be totally resected with negative margins (Table 1). The total resection rate is far more lower than that in other parts of the body. For these patients, additional treatments such as radiotherapy or chemotherapy are helpful. Previous studies showed that radiotherapy and chemotherapy significantly reduce the local recurrence of sarcoma [50, 51]. Unfortunately, the role of adjuvant radiotherapy and chemotherapy in the treatment of MFS is less clear due to the rarity of this tumor. Only several small studies reported the efficacy of chemotherapy in MFS [51, 52]. Additionally, the sensitivity of RIMFS to radiotherapy remains to be proven since they are induced by radiation.
MFS is a locally aggressive tumor that has a propensity for local recurrence (LR). Even after complete resection, the risk of recurrence is still high, ranging from 16 to 57% (Table 2). In contrast, the metastatic rate of MFS is relatively low, between 20 and 25%; the most common site is the lung, followed by the pleura, lymph nodes, and bones [40,41,42,43,44,45,46,47,48]. LR is more common for MFS in the head and neck. In the reviewed 28 cases, the LR rate was 43% (9/21), and all the RIS cases developed tumor relapse. But only 6 (25%, 6/24) cases developed tumor metastasis. Additionally, the prognosis of patients with RIS is generally worse than that with primary sarcomas of a similar stage . Due to a small sample size, varying diagnostic and grading criteria, and obscure definition of wide resection, the prognostic parameters for MFS are still controversial. Despite controversies, in most studies, margin status is the most important predictor of LR; wide resection and negative margin are positively related to low LR [40,41,42,43,44,45,46,47,48]. Therefore, margin-negative surgical resection is the cornerstone of treatment for MFS.
MFS is a locally aggressive tumor that has a propensity for local recurrence. Effective education about MFS, high-quality MRI imaging, biopsy, correct early diagnosis, and planned and wide surgical excision with negative margins are mandatory in order to provide the best results for MFS patients. Unfortunately, complex anatomical structures make MFS in the head and neck a great “challenge” to obtain a wide surgical margin. Therefore, in order to avoid local recurrence and distant metastasis, combined surgery and adjuvant chemoradiotherapy are recommended for MFS in this region. Further randomized double-blind controlled clinical trials are needed to confirm the efficacy of combined chemoradiotherapy for MSF in the head and neck.
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Gross total resection
Magnetic resonance imaging
Malignant fibrous histiocytoma
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Zhang, B., Bai, M., Tian, R. et al. Idiopathic and radiation-induced myxofibrosarcoma in the head and neck—case report and literature review. Chin Neurosurg Jl 7, 48 (2021). https://doi.org/10.1186/s41016-021-00267-9
- Head and neck
- Planned surgery
- Gross total resection
- Bin Zhang and Miao Bai are co-first authors