The diagnostic approach to solid pancreatic masses has significantly evolved from the era when a focal pancreatic mass was almost synonymous to pancreatic ductal adenocarcinoma,to a wide spectrum of pancreatic lesions...The diagnostic approach to solid pancreatic masses has significantly evolved from the era when a focal pancreatic mass was almost synonymous to pancreatic ductal adenocarcinoma,to a wide spectrum of pancreatic lesions,some of which have good prognosis.With the advent of advanced diagnostic tools,particularly refined imaging and tissue acquisition techniques,a broader spectrum of differential diagnoses has been recognized,encompassing conditions ranging from neuroendocrine tumors or inflammatory masses,to rare entities like metastatic clear cell sarcoma or solitary fibrous tumors.We herein discuss case reports of some rare pancreatic lesions,which were diagnosed by combining clinical and imaging features and endoscopic ultrasound-guided tissue sampling and confirmed on surgical specimens.Further reports on these rare pancreatic tumors will contribute to a better understanding of their pathogenesis and effective management.展开更多
Adult pancreatoblastoma is an exceptionally rare malignant tumour of the pancreas that mimics other solid cellular neoplasms of the pancreas,which may pose diagnostic difficulties.Because of its rarity,little is known...Adult pancreatoblastoma is an exceptionally rare malignant tumour of the pancreas that mimics other solid cellular neoplasms of the pancreas,which may pose diagnostic difficulties.Because of its rarity,little is known about its clinical and pathologic features.This article reviews the clinical and pathologic features of pancreatoblastoma in adults including differential diagnosis,treatment,and follow-up.Although pancreatoblastoma commonly occurs in childhood,there have now been more than 70 adult pancreatoblastomas described in the literature.There is a slight male predominance.There are no symptoms unique to pancreatoblastomas and adult patients are frequently symptomatic.The most common presenting symptom is abdominal pain.Grossly,the tumours are often large and well-circumscribed.Microscopically,pancreatoblastomas are composed of neoplastic cells with predominantly acinar differentiation and characteristic squamoid nests.These tumours are positive for trypsin,chymotrypsin,lipase,and BCL10.Loss of heterozygosity on chromosome 11p is the most common molecular alteration in pancreatoblastomas.Adult pancreatoblastomas are aggressive tumours with frequent local invasion,recurrence,and distant metastasis.Treatment consists of surgical resection.Chemotherapy and radiotherapy may have a role in the treatment of recurrent,residual,unresectable,and metastatic disease.It is important to distinguish pancreatoblastomas from morphological mimics such as acinar cell carcinomas,solid pseudopapillary neoplasms,and pancreatic neuroendocrine neoplasms.展开更多
文摘The diagnostic approach to solid pancreatic masses has significantly evolved from the era when a focal pancreatic mass was almost synonymous to pancreatic ductal adenocarcinoma,to a wide spectrum of pancreatic lesions,some of which have good prognosis.With the advent of advanced diagnostic tools,particularly refined imaging and tissue acquisition techniques,a broader spectrum of differential diagnoses has been recognized,encompassing conditions ranging from neuroendocrine tumors or inflammatory masses,to rare entities like metastatic clear cell sarcoma or solitary fibrous tumors.We herein discuss case reports of some rare pancreatic lesions,which were diagnosed by combining clinical and imaging features and endoscopic ultrasound-guided tissue sampling and confirmed on surgical specimens.Further reports on these rare pancreatic tumors will contribute to a better understanding of their pathogenesis and effective management.
文摘Adult pancreatoblastoma is an exceptionally rare malignant tumour of the pancreas that mimics other solid cellular neoplasms of the pancreas,which may pose diagnostic difficulties.Because of its rarity,little is known about its clinical and pathologic features.This article reviews the clinical and pathologic features of pancreatoblastoma in adults including differential diagnosis,treatment,and follow-up.Although pancreatoblastoma commonly occurs in childhood,there have now been more than 70 adult pancreatoblastomas described in the literature.There is a slight male predominance.There are no symptoms unique to pancreatoblastomas and adult patients are frequently symptomatic.The most common presenting symptom is abdominal pain.Grossly,the tumours are often large and well-circumscribed.Microscopically,pancreatoblastomas are composed of neoplastic cells with predominantly acinar differentiation and characteristic squamoid nests.These tumours are positive for trypsin,chymotrypsin,lipase,and BCL10.Loss of heterozygosity on chromosome 11p is the most common molecular alteration in pancreatoblastomas.Adult pancreatoblastomas are aggressive tumours with frequent local invasion,recurrence,and distant metastasis.Treatment consists of surgical resection.Chemotherapy and radiotherapy may have a role in the treatment of recurrent,residual,unresectable,and metastatic disease.It is important to distinguish pancreatoblastomas from morphological mimics such as acinar cell carcinomas,solid pseudopapillary neoplasms,and pancreatic neuroendocrine neoplasms.
