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01.12.2017 | Case Report | Ausgabe 1/2017 Open Access

European Journal of Medical Research 1/2017

Ovarian mucinous borderline tumor accompanied by LGESS with myxoid change: a case report and literature review

Zeitschrift:
European Journal of Medical Research > Ausgabe 1/2017
Autoren:
Wen Wang, Yalin Zhuang, Feng Zhou, Lili Huang
Abbreviations
LGESS
low-grade endometrial stromal sarcoma
CEA
carcinoembryonic antigen
CA125
cancer antigen 125
CA19-9
cancer antigen 19-9
MRI
magnetic resonance imaging
CD10
cluster of differentiation 10
PR
progesterone receptor
CK7
cytokeratin 7
CK20
cytokeratin 20
ER
estrogen receptor
SMA
smooth muscle actin
SLMN
sarcoma-like mural nodules
MMMT
malignant mixed Müllerian tumor

Background

Mucinous cystic tumors of the ovary, whether benign, borderline, or malignant, may be associated with mural nodules of various types, including sarcomas, sarcoma-like mural nodules, foci of anaplastic carcinoma, carcinosarcoma, mixed nodules, and leiomyomas [ 1, 2]. The subject of this report is a mural nodule with features of a low-grade endometrial stromal sarcoma (LGESS) with myxoid change arising in an ovarian mucinous borderline tumor. To our knowledge, there are no reports of mucinous ovarian tumors accompanied by LGESS with myxoid change.

Case report

A 42-year-old woman complained of lower left abdominal fullness. Her serum carcinoembryonic antigen (CEA), cancer antigen (CA) 125, and CA19-9 levels were within normal limits. Magnetic resonance imaging (MRI) showed a 10-cm cystic mass at the pelvic cavity with a 5-cm nodule in its wall. The laparoscopy showed a 10-cm cystic mass at the left adnexa. The right ovary and uterus were grossly normal. The patient underwent left salpingo-oophorectomy and adhesiolysis. The patient was symptom free 10 months after surgery.
On macroscopic examination, the cyst measured 10 cm in maximal diameter and had a thickness of 0.2–0.5 cm. This cystic tumor focally adhered to the peritoneum. The inner side was slightly uneven and attached with clot-like material in some area. The cyst had a solid mural nodule protruding from the wall into the lumen measuring up to 5 × 4 × 4 cm in size (Fig.  1a). The mass was found penetrating the surface of the cyst and invading to the tubal fimbria. The cut surface was fleshy and gray with the area of hemorrhage and necrosis (Fig.  1b).
Microscopic observation showed that the cystic walls were lined mainly by single-layered tall mucinous columnar epithelium (Fig.  2a). Some epithelium of cystic walls showed slightly atypical proliferation with glandular budding and stratification. The cells exhibited mild to moderate nuclear enlargement and hyperchromasia. Acellular pools of mucin in the stroma were present in some areas (Fig.  2b). Old hemorrhage can be found in the cystic wall (Fig.  2c). In addition, there was a proliferation of large mononucleated cells and scattered multinucleated giant cells in an area of the cyst wall without forming a true nodule (Fig.  2d).
A 5-cm mural nodule was identified in the hysterectomy specimen protruding into the cystic cavity, extending onto the serosal, and involving the tubal fimbria. The mural nodule had a characteristic of striking myxoid change, preservation of arteriolar pattern, and a “tonguelike” infiltration (Fig.  3a). There was a sharp demarcation between epithelial and sarcomatous components (Fig.  3b). The mural nodule consisted of sheets of small cells with oval to spindle nuclei, whorling around spiral arteriole-like vessels (Fig.  3c). There was mild to moderate nuclear atypia and the mitosis was 4/10 HPF (Fig.  3d).
Immunohistochemical staining is shown in Fig.  4. The tumor cells of the mural nodule were strongly positive for cluster of differentiation 10 (CD10) and progesterone receptor (PR) and was negative for cytokeratin 7 (CK7), CK20, estrogen receptor (ER), a-inhibin, calretinin, caldesmon, and smooth muscle actin (SMA), which is a typical feature of endometrial stromal sarcoma. The tumor cells had a high index of Ki67. The epithelium of cystic wall was locally positive for CK7 and CK20.
Taking into account the above features, we made the diagnosis as ovarian mucinous borderline tumor accompanied by LGESS with myxoid change involving the tubal fimbria.

Discussion

In 1979, Prat and Scully [ 3] described in detail the clinicopathologic features of mural nodules emphasizing their broad morphologic spectrum and varying biological behavior. Since then, the scope of ovarian mural nodules has been classified into sarcoma-like, sarcoma, and anaplastic carcinoma [ 4]. The present case is quite interesting because of the presence of LGESS with myxoid change.
Mural nodules can develop in benign, borderline, or malignant ovarian tumors. These mural nodules are seen as solid lesions on the wall of the tumor or protrude into the cyst lumen. The diagnosis of mural nodules in the residual ovary is based on the size and characteristic gross and microscopic features [ 5, 6]. The benign and reactive mural nodules, also called sarcoma-like mural nodules (SLMNs), occur in younger females and are usually sharply demarcated small lesions. Malignant mural nodules are large solid tumors; as sarcoma and anaplastic carcinomas, they tend to occur in older females.
A review of the literature revealed only five mucinous ovarian tumors with sarcomas, with most of the mural nodules measured > 5 cm in the greatest dimension. In these five cases, they were fibrosarcomatous mural nodule in an ovarian mucinous cystadenoma [ 7], fibrosarcoma arising in a mucinous cystadenocarcinoma [ 8], fibrosarcoma associated with a mucinous cystadenoma [ 9], undifferentiated sarcoma in a mucinous cystadenocarcinoma [ 9], and rhabdomyosarcoma coexistent with ovarian mucinous cystadenocarcinoma [ 10], respectively. Ovarian mucinous borderline tumor accompanied by LGESS with myxoid change in our case was rather unique. The clinical and pathological features are summarized in Table  1.
Table 1
Clinical and pathological features of mucinous ovarian tumors with sarcomas
Authors [reference]
Age
Symptom
Figo stage
No. of nodules
Size (cm)
Mural nodule
Epithelial ovarian tumor
Treatment
Follow-up
De Nictolis et al. [ 7]
na
na
na
na
na
Fibrosarcoma
Mucinous cystadenoma
na
na
Rahilly et al. [ 8]
69
Lower abdominal pain
IIA
One
na
Fibrosarcoma
Mucinous cystadenocarcinoma
TAH-BSO + appendicectomy + CTX
ned at 12 month
Scully et al. [ 9]
61
Abdominal swelling
IA
One
10
Fibrosarcoma
Mucinous cystadenoma
TAH-BSO + RT
Died at 18 month
 
49
Abdominal swelling
IVB
One
7
Undifferentiated sarcoma
Mucinous cystadenocarcinoma
BSO + OT + periaortic biopsy
Died at 1 week
Tsujimura et al. [ 10]
57
No obvious symptoms
IA
One
15
Rhabdomyosarcoma
Mucinous cystadenocarcinoma
TAH-BSO + CTX
ned at 3 month
This work
42
Abdominal fullness
IIA
One
5
LGESS with myxoid change
Mucinous borderline tumor
UA
ned at 10 month
ned, no evidence of disease; na, not available; TAH-BSO, tota abdominal hysterectomy and bilateral salpingo-oophorectomy; OT, omentectomy; SH, subtotal hysterectomy; UA, unilateral adnexectomy; RT, radiation therapy; CTX, chemotherapy
The differential diagnosis for extrauterine LGESS depends on the location of the tumor. In case of ovarian location, ovarian sex cord–stromal tumors should be excluded. The pathological and morphological characteristics and immunohistochemical findings in the present case do not favor ovarian sex cord–stromal tumors. LGESS with myxoid change can be confused with myxoid smooth muscle lesions, but the “tonguelike” infiltration and small arterioles, along with the CD10 immunostaining and muscle marker negativity, will usually resolve the diagnosis.
Tumors with a combination of different histology are divided into two clinicopathologic groups, collision or composite tumors [ 11]. The collision tumor has more than two juxtaposed masses and each mass displays a different histology. In contrast, the intermingling of more than two different components in one tumor mass is designated as a composite tumor. The well-known example is a malignant mixed Müllerian tumor (MMMT). It was noted that there was a sharp demarcation between epithelial and sarcomatous components in this case.
In this case, there was a region of proliferation of large mononucleated cells just beneath the epithelium without forming a true nodule, which may help explain the occurrence of malignant mural nodules. We hypothesize the forming process of this sarcoma as follows. The submesothelial mesenchymal cells reacted to the intramural hemorrhage or the mucinous content of the cyst, which eventually became a hyperplastic nodule, probably corresponding to the earlier stage of the SLMNs. Then the proliferation of mesenchymal cells resulted in the sustained expansion of the lesion. The nodule enlarged gradually and became SLMNs. Some of the SLMNs could possibly evolve into a true sarcoma with the proliferation and differentiation of mesenchymal cells.

Conclusions

We have presented a rare case of sarcoma-like mural nodule. Based on the ample evidence of the previous reports, and the immunohistochemical analysis of our case, we believe that this is a collision tumor with two different elements and may be formed by SLMN malignant change. Nevertheless, further molecular and genetic evidence is needed to support such a conclusion.

Authors’ contributions

All authors made substantial contributions to conception and design, or acquisition of data, or analysis and interpretation of data; WW and ZY were involved in drafting the manuscript and revising it critically for important intellectual content; ZF gave final approval to the version to be published. All authors read and approved the final manuscript.

Acknowledgements

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Consent for publication

Written informed consent was obtained from the patient for publication of this case report and any accompanying images.

Ethics approval and consent to participate

This study was approved by the ethics committee of the Women’s Hospital, School of Medicine Zhejiang University.

Funding

This work was supported by the program for Zhejiang Provincial Natural Science Foundation, P. R. China (No. LY12H04011).

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