Management of Malignant Solitary Fibrous Tumor of Pleura-A Diagnostic Conundrum and Literature Review

  1. Manish Sahni ,
  2. Dinesh Chandra Katiyar ,
  3. Snehal Kailas Karande ,
  4. Jyoti Chakraverty

Vol 10 No 3 (2025)

DOI 10.31557/apjcc.2025.10.3.881-887

Submitted: May 9, 2025

Published: Sep 10, 2025

Abstract

Introduction and Importance-Solitary fibrous tumors are rare neoplasms originating from CD34+ dendritic stromal cells with pleural cavity as the the most common site. Majority of them are benign and 10%−20% cases are malignant. This case report contributes to the sparse literature by detailing diagnostic and therapeutic approaches, emphasizing the role of surgical resection and adjuvant therapies. Case presentation-69-year-old gentleman presented right sided chest heaviness for last 3 months.  Investigations-CT scan chest revealed 13.6×13.0 x15.0cm right sided pleural based mass. Interventions and Outcome-CT guided biopsy of pleural based mass revealed solitary fibrous tumor with IHC marker positive for STAT6 and CD34. He underwent en bloc excision of mass with right upper and middle lobectomy via posterolateral thoracotomy. Patient had air leak on postoperative day 5 which was managed successfully by bronchoscopic guided glue instillation over apical lobe bronchus stump. Final histopathology showed solitary fibrous tumor with high risk of metastasis based on nuclear atypia, tumor necrosis, mitosis. Patient received adjuvant radiotherapy with the total dose of 50 Gy in 25 fractions. He is now on regular follow up every 6 monthly and is now disease from last 1 year. Relevance and Impact-Malignant solitary fibrous tumor of the pleura is a rare mesenchymal neoplasm with diagnosis primarily based on immunohistochemical study. Complete surgical resection remained the first-line treatment of MSFTP with radiotherapy reserved for patients with positive resection margin and malignant solitary fibrous tumor. Future randomized control trials are required to better understand the therapeutic approaches of this entity. This case report also highlights the successful role of bronchoscopic instillation of glue over air leak site.

Introduction

The most common site of the solitary fibrous tumor is the pleural cavity.Most of the SFTs are benign but malignant in 10%−20% of cases [1]. Non-specific clinical symptoms and imaging findings lead to difficulty in diagnosing this entity. Solitary fibrous tumors are a rare mesenchymal neoplasm that originates from CD34+ dendritic stromal cells [2-4]. The diagnosis of Malignant SFTP (MSFTP) is based on rapid growth, local invasiveness, high rates of recurrence and metastasis [2-4]. We hereby present a rare case report of malignant SFT of the pleura and review the literature on this entity. This study includes narrative review of the case reports and retrospective studies on this rare entity providing insight into the current state of knowledge and valuable insights paving a path for future research required for this rare entity.

Patient Information

A 69-year-old gentleman presented to our clinic with heaviness of chest and weight loss for the last 4 months. On further evaluation,Chest X-ray revealed large opacity in right upper side of the chest. Contrast-enhanced computed tomography scan revealed a large well-defined hypervascular enhancing soft tissue lesion with areas of internal necrosis and specs of calcification measuring 13.6× 13.0 x15.0cm predominantly involving right upper lobe bronchus and abutting adjacent pleura and right pulmonary artery (Figure 1A). Routine blood investigations including serum tumor marker levels were within normal range. Whole body PET-CT scan was performed which revealed large mildly avid mass lesion in right upper lobe abutting horizontal and oblique fissure ,laterally abutting costal pleura and medially bulging into mediastinal fat, encasing right upper lobe bronchus and abutting right pulmonary vessels.There was presence of non avid small prevascular and paratracheal nodes. There was no evidence of active disease elsewhere seen in the rest of the body (Figure 1 B).

Figure 1. A, CT scan chest showing right sided large well-defined pleural based soft tissue lesion. B, Whole body PET-CT scan showing faint FDG avid right sided lesion encasing right bronchus and abutting right pulmonary artery.

Intervention

A CT- guided transthoracic core biopsy of the mediastinal mass was performed, which revealed oval to spindle tumor cells having hyperchromasia and high N:C ratio with focal areas of hyalinization (Figure 2A).

Figure 2. A, Microscopic appearance showing oval spindle cells with hyperchromasia. B, Tumor cells positive for CD99 + marker. C, Post operative biopsy shows microscopic image with high Ki-67 index.

On subsequent IHC studies,the tumor cells were found to have strong positivity for STAT 6, CD34, CD 99,vimentin and negative for S100 and CK (Figure 2B). Final diagnosis favors the fibroblastic tumor with prominent staghorn vasculature consistent with solitary fibrous tumor. Case was discussed in multidisciplinary tumor board where plan for surgical excision of mass was taken.Patient was optimized for surgery and he subsequently underwent right posterolateral thoracotomy with excision of the mass along with right upper and middle lobectomy of lung as the large mass was densely adhered to right upper bronchus, superior pulmonary vein and upper lobe branches of right main pulmonary artery (Figure 3A, 3B).

Figure 3. A, Images showing intraoperative images of large right pleural based lesion adhered to right upper and middle lobe and parietal pleura. B, Resected mass with right bilobectomy.

Operative steps

After placing double lumen tube under general anaesthesia,patient was positioned in lateral position. After proper paint and draping, right posterolateral thoracotomy incision was made and pleural space was entered through 5th intercostal space. Operative findings were confirmed. The large pleural based mass was mobilized all around the parital pleura, apex and from inferior pulmonary ligament. It was a sessile mass adhering to right upper bronchus, superior pulmonary vein and upper lobe branches of right main pulmonary artery (Figure 3A). With the utilization of sharp dissection and after defining interlobar fissure,right upper and middle bilobectomy was performed as the upper and middle lobe bronchus were adhered to the tumor. Similarly, superior pulmonary vein was divided with vascular stapler. Finally, upper lobe branches from right pulmonary artery were divided. Intraoperative frozen section of bronchial cut margin was sent and was found negative for the tumor. Two intercostal drains were placed after achieving hemostasis and confirming adequate right lower lobe expansion.Wound was closed with ethibond sutures for rib approximation and skin staplers were applied.

Patient was shifted to Intensive care unit and was monitored there for 2 days. He was allowed oral diet from POD1 (postoperative day) and was started on incentive spirometry. He was started on chest physiotherapy and was made ambulatory on POD2. Serial post operative chest x ray revealed adequate right lung expansion but on POD5 there was presence of air leak in the intercostal drain and chest X ray revealed small apical pneumothorax in right side of chest with partial collapse of right lower lobe. His vitals remained stable with SPO2 remained above 95%. Decision to convert intercostal drain to negative suction pleural drainage with pleur-evac was done with negative suction settings of -20 atmospheric pressure. There was slight reduction in the volume of air leak, Chest X ray showed reduction in pneumothorax but there was fall of SPO2 to 90% on POD7 for which pulmonology consultation was sought for. CT chest was performed which revealed partial right lung collapse with no septal thickening. Patient’s consent was taken for bronchoscopic guided glue instillation at the bronchial stump leak site as it has shown to be an effective method for managing bronchial stump air leaks. Bronchoscopy was performed which revealed air leak in apical segment stump of right upper bronchus.Bronchoscopic guided glue instillation over leak site was performed precisely by our pulmonology team (Figure 4).

Figure 4. Bronchoscopic Guided Glue Instillation Over Bronchial Leak Site.

The air leak resolved and chest X ray shows normally expanded lung in the post-procedure period. There was no evidence of air leak in intercostals drains. He was discharged on POD 10 after the removal of the intercostals drains. Final histopathological evaluation of tumor revealed well circumscribed mass of size 22x20x11cm with areas of tumor necrosis on cut section of tumor. Microscopically,it revealed proliferation of spindle shaped cells attached to pleural bands with staghorn vasculature. There was moderate nuclear atypia and tumor necrosis was seen. Mitotic activity was 4-5/10 HPF. Resection margins were negative for tumor.On Immunohistochemistry (IHC), the tumor cells were positive for CD34,STAT 6 and CD 99 (strongly and diffusely). The ki-67 index in the tumor cells was 10% in the final biopsy (Figure 2C). Hence, final diagnosis of solitary fibrous tumor with high risk of metastasis was made. Case was discussed in multidisciplinary tumor board and patient was advised adjuvant radiotherapy 50Gy in 25 fractions during subsequent follow up visit. He is on now on regular follow up and is now disease free from last 1 year.

Discussion

SFTP was originally considered as a rare tumor and had several nomenclature like solitary fibrous mesothelioma,localized mesothelioma, submesothelial fibroma, and pleural fibroma. Finally it was established that SFTP originates from CD34+ dendritic stromal cells [4]. SFTP accounts for less than 5% of all pleural tumors with 80% of them originating from the visceral pleura [5]. The peak incidence rate is 50-70 years with slight female predilection [6]. Majority of SFTPs are benign with generally good prognosis following surgery while about 10%−20% of SFTPs are malignant [1]. The etiology of MSFTP is still unclear with no association found with the smoking, radiation, asbestos or other toxic substances while a family cancer history may be a risk factor for MSFTP [7]. Clinical symptoms are more commonly seen in MSFTP patient compared to benign SFTP (58% vs. 23%) [5]. It has been stated that high-grade malignant SFT developed after transformation of benign or low-grade malignant SFT while another hypothesis stated malignant SFT arising de novo [8]. Studies have investigated the role of genetic polymorphisms in association with cancer risk and similarly future research should be performed to explore genetic factors association in MSFTP patients [9]. It has been shown in a study which highlighted the challenges faced in cancer detection in elderly populations especially in rare tumors [10]. Therefore,future studies should emphasize the need for improved screening and diagnostic strategies in this rare entity.At present,to screen MSFTP patients with high recurrence risk,various risk prediction models are used based on biological and histopathological characteristics [11]. According to World Health Organization classification for soft tissue tumors, SFT was classified as a fibroblastic/myofibroblastic tumor [12]. The diagnosis of MSFTP has been suggested if any one of the following criteria is met: (1) a high mitotic rate (at least 4 mitotic figure counts per 10 high-power fields), (2) increased cellularity, (3) necrosis or hemorrhage, and (4) cellular and nuclear pleomorphism [4, 13, 14]. In our case too, final diagnosis of malignant SFTP was made on these features of invasiveness, necrosis,mitosis and Ki-67 index of 10%.The nerve growth factor-induced gene A binding protein 2 (NAB2) - signal transducer and activator of transcription 6 (STAT6) fusion gene is considered as specific molecular marker for SFT and facilitate its diagnosis [15, 16]. Contrast enhanced Computed tomography (CT) is the preferred modality for preoperative workup of MSFTP to assess the size, location and relation of tumor with the adjacent structures as well as in identifying the feeding vessels of the tumor, which aids in management decision on MSFTP. MSFTP features heterogeneous density on non-enhanced CT. Cystic changes, myxoid degeneration, hemorrhage, and necrosis may be seen within the lesion,calcification may also be seen in sufficiently large MSFTP with pleural effusions in some cases. Distant metastasis has been reported in MSFTP commonly in lungs, bones, liver, pancreas, thyroid gland, urinary bladder, central nervous system, and reproductive system with a dismal prognosis similar to malignant mesothelioma with metastasis [17-20]. The site of distant metastasis may vary depending upon the primary site of MSFT [17]. The use of 18F-Fluorodeoxyglucose positron emission tomography (18F-FDG PET /CT) lies in its ability to obtain both functional and morphological information, which can further aid the diagnosis, staging, and predicting prognosis in SFTP patients. CT guided percutaneous fine needle aspiration biopsy is a commonly performed procedure for the diagnosis and grading these tumors. Histopathologically, MSFTP often presents with large mass with varying degrees of necrosis and hemorrhage with histological examination showing spindle-shaped, fibroblast-like tumor cells with staghorn-shaped vessels,atypical mitotic figures, necrosis. Complete surgical excision remains the standard treatment to treat these entities [7, 21]. Intraoperative frozen section has a definitive role in all SFTPs to determine the nature of the tumor and tumor margin assessment. Therefore, the gold standard for the surgical treatment of MSFTP is still with thoracotomy [21]. However,the surgical procedure of VATS remained feasible option for pedunculated tumors and well demarcated tumors with advantage of reduced postoperative pain and early recovery [7, 22]. While lobectomy remained the procedure of choice for large sessile tumors originating from the visceral pleura and extending into lung parenchyma. For malignant tumors that have invaded lung parenchyma, chest wall, pericardium, and diaphragm, extended resection when necessary would be a feasible option [7]. The post operative complication of air leaks can be managed by standard bronchoscopic guided glue instillation over bronchial stump leak site with good outcomes as we have utilized this technique in our case too with successful outcome.Adjuvant radiotherapy after complete tumor resection is not recommended in patients with benign SFTP. Adjuvant radiotherapy (50Gy in 25 fractions) can be considered in patients with a positive surgical margin, tumor recurrence, or MSFTP [23]. However, benefits of radiotherapy is still unclear given the small sample size and short follow up time in the studies and also due to lack of randomized clinical trials. Therefore, the application of radiotherapy in MSFTP patients should be decided on an individual basis following multidisciplinary discussion. In our case, after multidisciplinary tumor board discussion, we adjuvant radiotherapy with the dose of 50 Gy in 25 fractions was advised on the basis of the presence of features of high risk of metastasis in the final histopathology report of the tumor. The efficacy of chemotherapy in SFT treatment is undetermined [24-32]. Conventional chemotherapeutic drugs for soft tissue sarcoma may include anthracyclines and ifosfamide, but their efficacy for this entity is largely unknown. A retrospective study in Europe reported that anthracyclines may be effective in the adavanced SFT treatment [31]. Temozolomide combined with bevacizumab have shown some efficacy in retrospective studies. But most studies have found conventional chemotherapy to be ineffective in SFT treatment [30, 33]. Molecularly targeted therapy that inhibits vascular endothelial growth factor or other tyrosine kinase inhibitors pathways has shown some positive prospects for the treatment of advanced SFT (Table 1) [24, 25] [34, 35].

Table 1. Different Studies on the Efficacy of Chemotherapy and Targeted Therapy in MSFT.

Studies Type of study Tumor and number of patients Type of therapy ORR (number of patients) mPFS (Months) Year of study Study limitations
Outani et al. [22] Retrospective Total -60 Anthracycline- based (11)   3 2021 Retrospective study
    MSFT-35 Gemcitabine− docetaxel (10)   8    
      Ifosfamide- based (7) - 2    
      Trabectedin (6)   3.5    
      Eribulin (4)   8    
      Pazopanib (22)   6.5    
Levard et al. [23] Retrospective Advanced SFT-23 Doxorubicin- based (19) 2 patients 5.2 2013 Retrospective study
      Vinorelbine (1)        
      Paclitaxel (1)        
      Carboplatin and paclitaxel (1)        
      Brostallicin (1)        
      In 2 nd , 3 rd or 4 th line:        
      Pazopanib (6)        
      Sunitinib (4)   5.1    
Stachiotti et al. [24] Retrospective MSFT -7 Doxorubicin + Dacarbazine 6 patients 6 2017 Low number of cases
    DSFT-5     10    
Khalifa et al. [25] Retrospective All -11 Trabectedin 1 patient 11.6 2015 Low number of cases and retrospective study
    MSFT-10          
Park et al. [26] Retrospective Advanced SFT-21 Doxorubicin- based (15) - 4.6 2013 Retrospective study with low case numbers
      Gmcitabine- based (5)        
      Paclitaxel (5)        
Stachiotti et al. [27] Retrospective MSFT -3 Dacarbazine 3 patients 7 2013 Retrospective study
    DSFT-5          
DeVito et al. [28] Retrospective SFT -21 Ifosfamide (10)     2015 No data on PFS
    MSFT-16 Taxane based (3) - -    
      Multiple regimens (9)        
      Other (5)        
Stachiotti et al. [29] Retrospective All -30 Anthracyclines -6 4 2013 Retrospective study
    MSFT -17   -2 3.5    
    DSFT-12   -4 5    
Chaigneau et al. [30] Case Report MSFT-1 Trabectedin 1 8 2011 Only case report-insufficient
Javier et al. [32] Phase II trial All -36 Pazopanib 2 5.6 2019 Phase III trials required with large number of patients enrollment
    MSFT -34          
    DSFT-02          
Stacchiotti et al. [33] Retrospective MSFT -3 Pazopanib 0 3 2014 Low number of cases and retrospective study

MSFT-Malignant solitary fibrous Tumor, mPFS-Median progression free survival, ORR-overall response rate.

Also retrospective studies have found bevacizumab, sunitinib, and pazopanib to be effective in soft tissue sarcoma treatment. Pazopanib has been approved for the treatment of soft tissue sarcoma and it improved the prognosis of advanced SFT patients in an Europian multicenter, single-arm phase II trial [34]. Meanwhile, sunitinib and sorafenib are in phase II clinical trials for the treatment of soft tissue sarcoma. In addition, axitinib may also be effective in the treatment of non-dedifferentiated SFT [34, 36]. Future studies should be done to explore the novel therapeutic agents to improve better responses and survival rates in this rare entity [37]. In general, benign SFTP has a good prognosis. In a single-center, retrospective study by Zhou,the 5-year overall survival rate of 70 benign SFTP patients was 100% [38]. In another retrospective study, the 5-year survival rate was 88.9%, and the median survival time was 23.7 years for 84 benign SFTP patients [39]. However,the risk of local recurrence and malignant transformation is always present.Hence the long-term follow- up is required in these MSFTP cases to ascertain the quality of life in this rare entity [40].

Large-scale studies have found that the 10-year recurrence rate of SFTP is about 10%−25%, and incomplete tumor resection is the most important risk factor for recurrence [40]. As for MSFTP, the rates of disease-free survival (DFS) and overall survival (OS) were much lower. In Zhou’s study, rates of 5-year DFS and OS in MSFTP patients were 58.3% and 66.7%, respectively while another retrospective study among benign SFT patients, the 5-year survival rate was 88.9% [38-39].

The limitation of this study - It is a case report and further future studies in the form of randomized controlled trials are required to know appropriate adjuvant therapies and its sequencing for this rare entity.

In conclusion, MSFTP is a rare mesenchymal neoplasm with unclear etiology till date. Clinical manifestations of MSFTP include non-specific symptoms such as chest pain, hemoptysis and dyspnea with imaging findings of MSFTP being largely non-characteristic.This case report highlights the importance of immunohistochemical markers and multidisciplinary management with the role of surgery and radiotherapy in improving outcomes of this rare malignancy requiring future randomized control trials to better understand the therapeutic approaches of this entity.This case report also highlights the successful role of bronchoscopic instillation of glue at the air leak site in an otherwise stable patient.

Acknowledgments

Statement of Transparency and Principals:

• Author declares no conflict of interest

• Study was approved by Research Ethic Committee of author affiliated Institute.

• Study’s data is available upon a reasonable request.

• All authors have contributed to implementation of this research.

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Author Details

Manish Sahni
Director of Surgical Oncology, Venkateshwar Hospital, Delhi, India.
sahniaarti6@gmail.com

Dinesh Chandra Katiyar
Director of Surgical Oncology, Venkateshwar Hospital, Delhi, India.

Snehal Kailas Karande
Department of Surgical Oncology,Venkateshwar Hospital, Delhi, India.

Jyoti Chakraverty
Deparment of Pathology, Venkateshwar Hospital, Delhi, India.

How to Cite

Sahni, M., Katiyar, D., Karande, S., & Chakraverty, J. (2025). Management of Malignant Solitary Fibrous Tumor of Pleura-A Diagnostic Conundrum and Literature Review. Asian Pacific Journal of Cancer Care, 10(3), 881-887. https://doi.org/10.31557/apjcc.2025.10.3.881-887
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