| Abstract|| |
Sarcomas are rare lesions of the liver and represent <1% of primary liver tumors. Embryonic sarcoma (undifferentiated) of the liver is a rare and aggressive malignant tumor that usually occurs in children with a peak incidence between 6 and 10 years. In adults, it is extremely rare with only 13 cases described in patients older than 40 years and 68 cases reported in patients older than 15 years. There is a slight predominance of females in adults. With an emphasis on morphological and immunohistochemical features, as well as on clinical data and imaging studies, we present this case report, in addition to extensive literature review on the topic.
Keywords: Embryonic neoplasms, liver neoplasms, liver pathology, rare tumor, sarcoma
|How to cite this article:|
Gerson G, Valença JT, Cavalcante JM, Coêlho RD. Undifferentiated embryonal sarcoma of the liver in elderly: Case report and review of the literature. Indian J Pathol Microbiol 2019;62:129-31
|How to cite this URL:|
Gerson G, Valença JT, Cavalcante JM, Coêlho RD. Undifferentiated embryonal sarcoma of the liver in elderly: Case report and review of the literature. Indian J Pathol Microbiol [serial online] 2019 [cited 2019 Apr 25];62:129-31. Available from: http://www.ijpmonline.org/text.asp?2019/62/1/129/251260
| Introduction|| |
Undifferentiated embryonic sarcoma of the liver (UESL) was initially described as mesenchymoma by Donovan & Santull and subsequently by Scout. In 1978, Stocker et al. described the embryonal sarcoma (undifferentiated) as a clinicopathological entity, with the publication of a series of 31 cases.
This is a rare entity with a higher prevalence in children over 5 years old. Nevertheless, it is second only to hepatoblastoma and hepatocellular carcinoma in terms of prevalence of malignant tumors in children.
The diagnosis is established UESL correlating the findings on imaging studies (US and computed tomography [CT]), serum levels of alpha-fetoprotein, and the patient's age. The images may vary between solid and cystic lesions. When you have more prominently cystic, the main differential diagnosis is hamartoma mesenchymal and hydatidiform liver cyst.
| Case Report|| |
The case consists of a male patient aged 71 who had a clinical presentation of nausea, vomiting, and weight loss (20% reduction of its total weight), with palpable epigastric mass and painless to rise for about 1 month.
On physical examination, it was noticed irregular abdominal mass, ill-defined, hard, and palpable 15 cm below the right costal margin. Patient was referred to the clinical and surgical oncology service at Haroldo Juaçaba Hospital/Ceará Cancer Institute, where he performed CT revealing the large expansive formation of solid-cystic complex aspect with gross septa measuring 26.0 cm × 23.0 cm × 16.0 cm, located in the left hepatic lobe topography and underwent hepatic lobectomy.
Macroscopic examination of the surgical specimen showed large lesion measuring 24.5 cm × 22.0 cm, with heterogeneous cut surface with multilocular cystic areas and brown solid areas with extensive foci of necrosis and hemorrhage. Microscopic analysis revealed neoplastic cells with pleomorphic nuclei and high mitotic activity, dispersed in fibromyxoid stroma and large areas of necrosis [Figure 1]. The neoplastic cells had positive intracytoplasmic hyaline globules in staining of the periodic acid-Schiff (PAS).
|Figure 1: Right: High cellularity, pleomorphism and pleomorphic giant cells (arrow), ×4. Left: Detail of bizarre cell with large nuclei, ×40|
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|Figure 2: Above: Diffuse expression of vimentin, ×4. Below: Immunoreactivity of alpha-1-antitrypsin, ×20|
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The immunohistochemical study showed positivity for alpha-1 antitrypsin, desmin, and vimentin on the suspected cells [Figure 1]. The findings corroborate the diagnosis of embryonal sarcoma undifferentiated [Table 1].
The patient progressed well in the postoperative period and was discharged with subsequent follow-up.
| Discussion|| |
Clinically, most patients present with abdominal distension palpable and painful tumor in the epigastric region or in the right upper quadrant of rapid growth. Some patients may present with nonspecific gastrointestinal symptoms and weight loss. The liver function tests usually have levels within the normal range. In some cases, there are reports of increased serum alkaline phosphatase. Fever, probably, due to hemorrhage and necrosis mass may be present.
The mean age at presentation in adults is 25 years. The male/female ratio is 1:1.3. Clinical presentation is nonspecific with upper abdominal pain with or without palpable mass. May or may not be accompanied by systemic symptoms such as fever, weight loss, and changes in bowel habits, can rarely simulate an acute abdomen by appendicitis, due to rupture of the tumor with hemoperitoneum and peritoneal irritation in the right iliac fossa.
The radiological findings on ultrasound and CT range from complex solid and cystic images, averaging 14 cm lesion size, showing myxoid, hemorrhagic, and mucinous components. In general, the ultrasound shows predominantly solid and echogenic mass with cystic lesions of minor component, which is on average a fifth of the tumor. CT scan, paradoxically demonstrates a hypodense lesion with hyperdense septa of variable thickness which enhance the contrast medium.
In magnetic resonance imaging (MRI), in general, most of the damage has hypointense on T1 and hyperintense on T2, characterizing it also as predominantly cystic lesion with about of 88% of the neoplasm with attenuation close to the water. The angiographic findings in patients are variable and nonspecific, and the hypovascularity seems to be the most common presentation., Cystic areas are on average about 19% of the total volume of the tumor. Tumors with important cystic component can simulate mesenchymal hamartoma and hydatid cysts of the liver. The differential diagnosis includes all the lonely hepatic masses that may have cystic components in CT and MRI, as mesenchymal hamartoma, biliary cystadenoma, and cystadenocarcinoma and causes infectious (abscess or pyogenic parasitic), metastases, and hematoma resolution. Solitary solid tumors that develop cystic degeneration and also enter the differential diagnosis.,
Histopathologically, these are described as characteristics of expansive growth injury, extensive areas of hemorrhage, and necrosis. The cells are medium to large, fusiform, or pleomorphic multinucleated, withpresence of intra and extracellular PAS positive and diastaseresistance granules.
The diagnosis of UESL is favored by some clinical and morphological features. The peak incidence is between 6 and 10 years of age, in comparison with a younger age in most patients with mesenchymal hamartoma (<2 years) embryonal and rhabdomyosarcoma (2–5 years). Typically, it has normal laboratory values of alfa-fetoptotein and carcinoembryonic antigen, unlike other tumors, such as hepatoblastoma and hepatocellular carcinoma. It is composed of pleomorphic spindle cells and giant cells, unlike mesenchymal hamartoma. Finally, the neoplastic cells did not exhibit cross ribs, as observed in rhabdomyosarcoma. Moreover, the resistant cells and PAS-positive diastase are commonly found in embryonal sarcoma and is usually not seen in mesenchymal hamartoma, embryonal rhabdomyosarcoma, or other sarcomas involving the liver. In some cases, immunohistochemistry may be needed to help distinguish the embryonic sarcomas and other sarcomas involving the liver or sarcomatoid variant of hepatocellular carcinoma.
The immunohistochemical characteristics of embryonal sarcoma are not specific, with a variable positive expression of cytokeratins vimentin, alpha-1-antitrypsin and alpha-1-antichymotrypsin,. Variable positive expression has also been reported, although less frequent, with the following markers: desmin, smooth muscle actin, actin muscle-specific, CD68, and lysozyme. In most series in embryonal sarcoma of the liver, there was no marking to S100. The markers are used primarily to exclude other tumors including hepatocellular carcinoma and hepatoblastoma (Heppar); embryonal rhabdomyosarcoma (myogenin); vascular tumors and fibrous solitary tumor (CD34); anaplastic large cell lymphoma and inflammatory pseudotumor (ALK-1); gastrointestinal stromal tumors (C kitcom cytoplasmic and CD34 marking); metastatic emelanoma neural tumors (S100); and metastatic clear-cell adenocarcinoma (PE10).
Ultrastructural studies and immunohistochemical indicate the mesenchymal origin of the tumor, and some authors suggest that histogenesis is common among the undifferentiated sarcoma and rhabdomyosarcoma of the liver, probably due to a multipotent mesenchymal stem cell. Some evidence suggests that the sarcoma embryonic (undifferentiated) of the liver is derived, in some cases, the malignant transformation of mesenchymal hamartoma. Recent studies emphasize the possible involvement of specific genes, such as p53, in the development of embryonal sarcoma.
The diagnosis of UESL implied; in the past, a poor prognosis, however, today, new experiments show better responses with longer disease-free survival at 5 years. Complete surgical resection is the great pillar of therapy. Due to its low incidence, there is no consensus in handling with surgery and adjuvant chemotherapy, the most recommended treatment.
There is little evidence of adjuvant chemotherapy; however, some studies show improved survival and a lower rate of recurrence of injury, yet still requiring extensive evaluation and studies to create specific chemotherapy protocols.
| Conclusion|| |
Embryonic sarcoma is extremely rare in adults and histopathological analysis is essential to confirm the diagnosis, since the radiological findings cannot claim a pattern of suspicious changes. Immunohistochemical study, although no specific markers, enables to rule out other types of sarcoma and metastatic tumors.
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Conflicts of interest
There are no conflicts of interest.
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