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      Pancreatoblastoma in a paediatric patient: anatomo-pathological aspects of a case with multiple hepatic metastases

      case-report

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          Abstract

          Pancreatoblastoma is a rare paediatric malignant neoplasm. The treatment of choice is complete surgical resection. However, it is often unresectable due to its large size, local infiltration or distant metastasis. Since the condition is rare, there is currently no standard treatment regimen. We outline the case of a 4-year-old child who presented with abdominal pain and distention, together with an enlarged liver and elevated serum α-fetoprotein levels. Imaging studies showed the presence of an abnormal pancreatic tumour and multiple nodular lesions in the liver, the biopsies from which led to a diagnosis of pancreatoblastoma. In this case, the patient received cycles of neoadjuvant chemotherapy, combining cisplatin and doxorubicin. The patient subsequently underwent scheduled surgery in which the primary pancreatic lesion was resected, obtaining a circumscribed and nodular specimen measuring 7 × 6 cm and weighing 150 g. Given the extent of the metastasis, the child is currently awaiting a liver transplant.

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          Most cited references21

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          Multimodality imaging of neoplastic and nonneoplastic solid lesions of the pancreas.

          Solid lesions of the pancreas represent a heterogeneous group of entities that can be broadly classified as either neoplastic or nonneoplastic. Neoplastic lesions include pancreatic adenocarcinoma, pancreatic neuroendocrine tumor, solid pseudopapillary tumor, pancreatoblastoma, pancreatic lymphoma, metastases to the pancreas, and rare miscellaneous neoplasms. Nonneoplastic lesions include focal pancreatitis, fatty infiltration-replacement, intrapancreatic accessory spleen, congenital anomalies such as prominent pancreatic lobulation and bifid pancreatic tail (pancreatic bifidum), and rare miscellaneous lesions (eg, pancreatic sarcoidosis, Castleman disease of the pancreas). A variety of imaging modalities are available for assessing these solid lesions, including ultrasonography (US), computed tomography (CT), magnetic resonance imaging, endoscopic US, and hybrid nuclear imaging techniques such as single photon emission computed tomography-CT and positron emission tomography-CT, each of which has its own strengths and limitations. Accurate diagnosis can be challenging, and use of a multimodality imaging approach is often helpful in equivocal or complex cases. Knowledge of relevant clinical information and key radiologic features is essential for confident lesion characterization and differentiation.
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            Pancreatic tumors in children: radiologic-pathologic correlation.

            Pancreatic neoplasms are rare in children and have a different histologic spectrum and prognosis than those in adults. In general, these tumors are well demarcated with expansile rather than infiltrating growth patterns. They may be quite large at diagnosis, and central cystic necrosis is common. They infrequently cause biliary duct obstruction. The imaging appearance of each neoplasm reflects its pathologic features. Pancreatoblastoma is the most common pancreatic neoplasm in young children. At imaging, pancreatoblastomas are heterogeneous and often multilocular with hyperechoic and enhancing septa. Solid-pseudopapillary tumor occurs in adolescent girls. It is heterogeneous in internal architecture, with a mixture of solid and cystic hemorrhagic and necrotic elements. This tumor is distinguished by its fibrous capsule and hemorrhagic nature, which are best shown at magnetic resonance imaging as a dark rim on T1- or T2-weighted images and hyper-intense foci on T1-weighted images, respectively. Islet cell tumors in children are insulinomas or gastrinomas. These tumors manifest early due to hormonal syndromes and are distinguished by their small size, homogeneous appearance, and intense enhancement with intravenous contrast material. All pancreatic neoplasms in children are capable of producing metastases, usually to the liver and lymph nodes; however, on the whole, these tumors have a better clinical outcome than most pancreatic tumors in adults. Knowledge of the differential diagnosis of pancreatic masses in children and their relatively good prognosis may promote correct preoperative diagnosis and appropriate treatment.
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              Pancreatoblastoma. A clinicopathologic study and review of the literature.

              Pancreatoblastoma is a rare pancreatic tumor with a distinctive histologic appearance that generally affects infants and young children. We have studied 14 cases of pancreatoblastoma and reviewed 41 previously reported examples. Nine of our cases occurred in children (from newborn to 4 years old; mean, 2.4), and five affected adults (from 19 to 56 years old; mean, 40). There were 8 male cases and 6 female cases. Most patients presented with incidental abdominal masses, although pain, weight loss, and obstructive jaundice were present, but rarely. The tumors were very cellular microscopically, with cytologically uniform epithelial cells arranged in sheets and nests. Well-formed acinar structures were a consistent feature, and several cases contained ectatic ductular formations, rarely exhibiting intracellular mucin. Consistently present were squamoid corpuscles: circumscribed, whorled nests of plump spindle cells with a squamous appearance and occasional keratinization. The stroma was moderate to abundant and frequently quite cellular (especially in the pediatric cases). By immunohistochemistry, the tumors exhibited acinar, endocrine, and ductal differentiation, with positivity for pancreatic enzymes (100%), endocrine markers (82%), and carcinoembryonic antigen (85%). Ultrastructural examination most commonly revealed acinar differentiation, although mucigen granules and neurosecretory granules were also occasionally found. The behavior was variable: 36% of patients developed metastases, especially to the liver. The adult patients did poorly: three of five died of tumor (mean survival, 18 months), and two were alive at 5 and 15 months, respectively. In contrast, five of the six evaluable pediatric patients were alive from 22 months to 22 years after diagnosis, and only one died of tumor after 16 months. Good responses to chemotherapy were noted in the pediatric group.
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                Author and article information

                Journal
                Ecancermedicalscience
                Ecancermedicalscience
                ecancermedicalscience
                ecancermedicalscience
                Cancer Intelligence
                1754-6605
                2018
                22 August 2018
                : 12
                : 861
                Affiliations
                [1 ]Anatomical Pathology Division, Pedro De Elizalde Children’s Hospital, Avenida Montes de Oca 40 (C1270AAN), Buenos Aires, Argentina
                [2 ]National Council of Scientific and Technical Research (CONICET), Godoy Cruz 2290 (C1425FQB), Buenos Aires, Argentina
                Author notes
                Correspondence to: Gabriel Cao. gabrielcao@ 123456fibertel.com.ar
                Article
                can-12-861
                10.3332/ecancer.2018.861
                6113986
                11f81d67-cfa6-4266-b22d-f3e7daea3147
                © the authors; licensee ecancermedicalscience.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 20 May 2018
                Categories
                Case Report

                Oncology & Radiotherapy
                pediatric pancreatoblastoma,pathology,treatment
                Oncology & Radiotherapy
                pediatric pancreatoblastoma, pathology, treatment

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