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Rare adrenal gland incidentaloma: an unusual Ewing’s sarcoma family of tumor presentation and literature review

  • Hui Guo1,
  • Shuaiqi Chen2,
  • Shukun Liu1,
  • Kaixuan Wang1,
  • Erpeng Liu1,
  • Faping Li1 and
  • Yuchuan Hou1Email author
Contributed equally
BMC UrologyBMC series – open, inclusive and trusted201717:24

https://doi.org/10.1186/s12894-017-0217-3

Received: 22 November 2016

Accepted: 27 March 2017

Published: 4 April 2017

Abstract

Background

Members of the Ewing’s sarcoma family of tumor (ESFT) are malignant neoplasms and rarely observed in the adrenal gland.

Case presentation

We report an extremely exceptional case of ESFT rising from the adrenal gland in a 57-year-old Chinese man. The patient was hospitalized with abdominal swelling for 2 months. Computed tomography (CT) scan revealed a nearly-circular mass measuring about 8.1 × 10.6 cm in the right adrenal region. The patient underwent right adrenal resection. Histopathologic examination found the tumor was composed of small round blue cells forming typical Homer-Wright rosettes in focal area. The immunohistochemical analysis confirmed the case to be ESFT, which was positive for membranous CD99 and nuclear FLI-1. The patient was scheduled for four courses of large doses of chemotherapy and died for cancer metastasis one year later after surgery.

Conclusions

Histopathological evidence of Homer-Wright rosettes and immunohistochemical markers positivity, such as CD99 and FLI-1, are valuable factors for ESFT diagnosis, although cytogenetic analysis is considered as the gold standard. Complete surgery is the treatment of choice for ESFT and adjuvant radiotherapy and combination chemotherapy can significantly improve the survival rate of postoperative patients.

Keywords

Ewing’s sarcoma family of tumor Adrenal gland Diagnosis, Treatment

Background

The Ewing’s sarcoma family of tumor (ESFT) are rare aggressive malignancies and consist of Ewing’s sarcoma (ES) of bone, extraosseous Ewing’s, primitive neuroectodermal tumor (PNET), and Askin’s tumor [1, 2]. These distinct entities are characterized by common histopathological and immunohistochemical features, including a primitive undifferentiated small round blue cell associated to a variable level of palisading and rosette formation, as well as strongly positive for the cell surface glycoprotein CD99 [35]. The defining feature of the ESFT is a nonrandom chromosomal translocation and the most frequent is EWS-FLI1 fusion [6, 7]. These highly aggressive malignancies most commonly arise in the soft tissue or bone in adolescents and young adults [8]. Reports of cases arising from the adrenal gland are extremely rare. To the best of our knowledge, there are 32 cases in the English literatures [5, 930]. We report an additional ESFT case arising from the adrenal gland and discuss its clinical and histopathological characteristics, as well as unusual therapeutic strategies.

Case presentation

A 57-year-old man presented to the First Hospital of Jilin University (Changchun, China) with the main complaint of abdominal swelling for 2 months. In addition to the mild percussion pain in the right kidney region, no other symptoms were noted during a physical examination. His past medical history was unremarkable. Computed tomography (CT) scan of the abdomen revealed a nearly-circular mass measuring about 8.1 × 10.6 cm arising from the right adrenal gland (Fig. 1a). The CT also showed heterogeneous density, both solid and cystic components and calcification of the mass. The lesion showed heterogeneous enhancement and relatively sharp margination on Contrast-enhanced CT (Fig. 1b). Contrast-enhanced CT scan further defined the large mass was located between the liver and kidney with characteristics consistent with the soft tissue. Vena cava, right renal vein were compressed and displaced. No obvious metastasis was apparent.
Fig. 1

Abdominal computed tomography (CT) scan revealed a large mass (arrow) arising from the right adrenal gland (a). The lesion showed heterogeneous enhancement and relatively sharp margination (arrow) on Contrast-enhanced CT (b)

The patient underwent open surgery under general anesthesia. A 10.0 cm × 8.0 cm × 6.0 cm mass was found during laparotomy. The tumor was located above the left renal vein and the right renal vein without venous involvement. Due to firmly adhesion with the surrounding tissue, tumor dissection was difficult. Intraoperative blood loss was 800 mL and the tumor was completely removed eventually. Postoperative histopathology showed a monotonous population of small round blue cells with occasional Homer-Wright-type rosettes (Fig. 2). The results confirmed the diagnosis of PNET. The immunohistochemical staining was performed supporting the previous diagnosis, which was positive for CD99, FLI-1, NeuN, CGA and VIMENTIN (Fig. 2), while negative for EMA, SYN and LCA.
Fig. 2

Histopathologic examination showed small round blue cells forming Homer-Wright-type rosettes (H&E, ×400). Immunohistochemical staining revealed the tumor cells were positive for CD 99, FLI-1, NeuN, CGA and VIMENTIN (original magnification × 400)

The patient was scheduled for adjuvant chemotherapy with adriamycin, cyclophosphamide, ifosfamide and etoposide. At his follow-up, 5 months after surgery, CT scan results demonstrated a metastatic lesion arising from the right abdominal wall. Unfortunately, the patient died for cancer metastasis one year later after surgery.

Discussion

ESFT rising from the adrenal gland is extremely exceptional but malignant. Patients often present with tumor compression, flank pain or mass. However, its preoperative imaging diagnosis is difficult and histopathological and genetic tools are required for an accurate diagnosis.

Histopathologically, ESFT appear as immature or primitive small round blue cell tumors infiltrating the soft tissue or bone in a diffuse or lobular pattern. The tumor cells have round to oval nuclei with coarsely stippled chromatin and indistinct nucleoli. The scanty cytoplasm is pale or clear. In addition, these cells are often accompanied by hemorrhage and necrosis. ESFT are mainly represented by the existence of typical Homer-Wright-type rosette or other types of rosettes [17, 31].

Immunohistochemical markers such as CD99, FLI-1, HNK-1 and CAV-1 are commonly expressed in ESFT and provide valuable support to the definitive diagnosis. CD99, a 32-kDa cell surface glycoprotein, is encoded by the MIC2 gene and extremely sensitive for ESFT [4, 14]. The sensitivity is as high as 95% although the specificity is low [14, 31]. Its expression is also observed in T-lymphoblastic lymphoma, rhabdomyosarcoma, synovial sarcoma, and small cell anaplastic osteosarcoma [3235]. ESFT can be potentially misdiagnosed based merely on expression of CD99. Even so, CD99 is still the most reliable immunohistochemical marker for ESFT. FLI-1, as well as HNK-1, appears reliable but less sensitive for ESFT than CD99 [4, 31]. All authors agree that both markers are expressed in various other round cell tumors [36]. CD99 and FLI-1 are mainly used for the diagnosis of ESFT and an immunohistochemical panel consisting at least these two makers is recommended [3739]. CAV1, a membrane protein, its high expression is associated with the anchorage-independent growth [40, 41]. Express CAV1 have been shown to be more aggressive and metastatic [41]. CAV1 appears as a diagnostic immunohistochemical marker of ESFT being positive in CD99-negative cases [31]. In addition, markers of NSE, VIMENTIN, cytokeratin and S-100 have been detected in a subset of ESFT by immunohistochemistry.

At present, cytogenetic analysis is the “gold standard” for diagnosis of ESFT. Conventional tests are valuable to make the definitive diagnosis such as Southern blot, Northern blot analyses, FISH and RT-PCR [14, 39, 42]. The diagnosis of our case, ESFT rising from the adrenal gland, was not based on the cytogenetic findings. However, it was supported by the histopathological findings of poorly differentiated, small round blue cells forming typical Homer-Wright rosettes and the immunohistochemical findings of strongly positive for CD99, FLI-1 and negative for differentiation markers such as epithelial sufficiently.

ESFT is an aggressive malignancy with very poor prognosis [6]. Multimodality regimens including surgical resection, adjuvant chemotherapy and radiation therapy are often required [43]. Current surgical approaches include open, laparoscopic and robotic resection. The latter two are more difficult to perform because the large tumor is often accompanied by liquefaction and/or necrosis. Jacob Stephenson et al. [5] reported a ESFT arising from adrenal gland, during operation with the robotic assistance, the tumor capsule was ruptured, which may lead to metastasis and increase the dose of chemotherapy and radiotherapy. Hence, the surgical approach should be selected in accordance with patient’s condition.

Cooperative group studies have led to chemotherapy regimens using the same drugs (vincristine, doxorubicin, cyclophosphamide, ifosfamide, and etoposide), although the exact regimens differ in Europe and North America [2]. Only 16 cases of ESFT arising from the adrenal gland have been reported since 2011. Eleven of these sixteen patients received surgery. Nine received adjuvant chemotherapy and five received radiation treatment. Only two patients with small mass and no evidence of metastasis are alive and disease free. The two long-term survival of patients received multimodality regimens using a combination of complete surgery, as well as chemotherapy and radiotherapy (Table 1). We conclude that complete surgery is the treatment of choice for ESFT. Adjuvant chemotherapy and postoperative radiotherapy have shown significant improvements in survival. The tumor size and metastases are predictors for survival and effect prognosis obviously.
Table 1

Summary of Reported Cases of ESFT Rising from the Adrenal Gland (F: female; M: male; IVC: inferior vena cava; Surg: surgery; Chemo: chemotherapy; RTx: radiotherapy; NR: not recorded)

Case Report (Reference Number)

Age

Gender

Chief Complaint

Position

Tumor Size (cm)

Initial Infiltration or Metastasis

Treatment

Outcome at Time of Report

9

17

F

NR

NR

NR

Liver, lung, lymph node

Chemo + RTx

Dead

8

M

NR

NR

NR

Bone, lung

Surg + chemo + RTx

Dead

4

M

NR

NR

NR

Lung

Surg + chemo + RTx

Dead

10

46

F

NR

NR

NR

NR

NR

NR

20

F

NR

NR

NR

NR

NR

NR

48

F

NR

NR

NR

NR

NR

NR

11

32

F

Abdominal pain

Left

10

Liver

Surg + adjuvant chemo

Dead

12

57

M

Lower extremity pain, edema

Right

15

None

Surg

NR

13

11

M

Abdominal tumor

Right

13

Peritoneum

Surg + chemo + RTx

Dead

14

28

F

Recurrent mass

Right

10

Lung

Surg + chemo

NR

15

25

F

Abdominal pain

Left

15.2

IVC, lung

NR

NR

24

F

Flank pain

NR

8.4

Supraclavicular lymph node

NR

NR

16

53

F

Adrenal tumor

Right

3

None

Surg

Alive

17

30

M

NR

Right

12

IVC tumor embolus

Surg + RTx

Dead

21

F

NR

Left

10

Liver

None

Dead

24

F

NR

Left

9

Pelvic lymph node

Surg + chemo

Metastasis

22

M

NR

Left

17

IVC tumor embolus

Surg + chemo

Local recurrence

18

20

F

Flank pain, anorexia, weight loss

Right

Large

Lung

Neo-adjuvant chemo

Unknow

5

17

F

Flank pain

Right

5

None

Surg + adjuvant chemo + RTx

Alive

19

26

F

Flank pain

Left

Large

IVC tumor thrombus

Surg + chemo + RTx

Alive

20

17

M

Swelling, abdominal pain

Right

21.3

Liver, lung

Systemic chemotherapy

Alive

21

17

F

Abdominal Pain, fever

Left

15

None

Surg + adjuvant chemo + RTx

Recurrence

22

26

F

Flank pain

Left

11.3

IVC tumor thrombus

Surg + adjuvant chemo + RTx

Alive

23

63

M

None

Left

3.2

None

Surg + adjuvant chemo

Alive

24

40

F

Abdominal pain, swelling, respiratory distress

Left

14.6

Retroperitoneal muscles

Surg + adjuvant chemo

Alive

25

37

F

Loin pain

Left

8

Kidney

Surg

Alive

26

26

M

None

Right

8

None

None

Dead

27

37

F

Flank pain, abdominal pain

Left

12

Crus of diaphragm, kidney

Surg + adjuvant chemo

Alive

28

17

F

Abdominal pain

Left

3.3

None

Surg + adjuvant chemo + RTx

Alive

29

23

M

Flank pain, weight loss

Right

15

Kidney, head of pancreas, liver

None

Unknow

27

M

Pain

Right

NR

Kidney, liver, pancreas

Chemo

Dead

30

48

F

Abdominal pain, swelling

Left

12

None

Surg

Recurrence

Present case

57

M

Swelling

Right

10.6

None

Surg + adjuvant chemo

Dead

Conclusion

ESFT rising from the adrenal gland is a rare clinical entity. Histopathological evidence of Homer-Wright is crucial for ESFT diagnosis. The neural markers, such as CD99, FLI-1, HNK-1 and CAV-1, may play a valuable role in the immunohistochemical diagnosis of ESFT. The definitive diagnosis of ESFT requires a combination of immunohistochemical examination, as well as histopathologic evaluation, although the “gold standard” will obviously remain cytogenetic analysis. Complete surgery is the treatment of choice for ESFT. Adjuvant chemotherapy and postoperative radiotherapy have shown significant improvements in survival. The tumor size and metastases are predictors for survival and effect prognosis obviously.

Abbreviations

CAV-1: 

Caveolin-1

CD99: 

Cluster of differentiation 99

CGA: 

Chromogranin A

CT: 

Computed tomography

ES: 

Ewing’s sarcoma

ESFT: 

Ewing’s sarcoma family of tumor

LCA: 

Leukocyte common antigen

NSE: 

Neuron-specific enolase

PNET: 

Primitive neuroectodermal tumor

SYN: 

Synaptophysin

Declarations

Acknowledgments

The authors thank the patient and his families for allowing us to publish this case report. We also thank Professor Meishan Jin (Department of Pathology, First Hospital of Jilin University, Changchun 130021, China) as the pathologist for reviewing and confirming the histological diagnosis for our patient.

Availability of data and materials

The data that support the findings of this study are available from the corresponding author on reasonable request.

Authors’ contributions

HG and SQC wrote the manuscript and made the revisions. SKL, KXW, EPL and FPL participated in data collection. YCH collected cases and do the check. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Written informed consent was obtained from the patient for publication of this case report and any accompanying images. The data do not contain any information that could identify the patient. A copy of the written consent is available for review by the editor of this journal.

Ethics approval and consent to participate

All procedures were approved by the Ethics Committee of First Hospital of Jilin University

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Authors’ Affiliations

(1)
Department of Urology, First Hospital of Jilin University
(2)
Department of Urology, The First Affiliated Hospital of Xinxiang Medical University

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© The Author(s). 2017

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