Exocrine Types of Pancreatic Cancer
The exocrine pancreas results in 99 percent of pancreatic cancers. Most of the types of pancreatic cancer form in the head and neck of the pancreas. A few form in the body and less than 10% form in the tail of the pancreas.
Pancreatic Cancer
Adenocarcinoma type of pancreatic cancer form in the head and duct cells of the pancreas. Adenocarinomas are prevalent in 75 percent of the exocrine pancreatic cancers. Cells form colse to an empty space. Metastasis usually occurs from adenocarcinomas and typically spread to the lymph nodes and liver.
Acinar cell carcinoma produces surplus digestive enzymes. It accounts for about 1% of pancreatic cancers. It rarely occurs in children and outcome is generally good in children than adults. It metastasizes into lungs, liver, and lymph nodes, arising from any tissue of the pancreas. Adenosquamous carcinomas are very similar to adenocarcinoma and are often identified as such. Adenosquamous carcinoma tends to form glands and level as they grow. It is rare and pathology is very poor.
Giant cell tumors appear similar to giant cell tumors of the bone and are coupled with stromal cells. Differentiation of adenocarcinoma is identified under light microscopy. Giant cell tumors typically have epithelial appearance. This type of pancreatic cancer is rare.
Intraductal Papillary Mucinous Neoplasms are slow growing (15 years) that can lead to adenocarcinomas. Intraductal Papillary Mucinous Neoplasms succeed in only 1% of pancreatic cancers. They grow along the pancreatic ducts and can appear as a small angle into the duct.They are generally identified by three features:
a. Expanding pancreatic duct
b. Spreading ampullary opening
c. Mucous secretion
Mucinous Cystadenocarcinomas are more prevalent in the body and tail of the pancreas. They can be greater then 10 centimeters. pathology with this type of pancreatic cancer generally better. Pancreatoblastomas are rare (0.5 percent) exocrine tumors typically found in children less than 10 years old, though it can occur throughout lifetime. Pancreatoblastomas are identified more often in males and Asians. They appear as a knot of cells among general cells. Survival is good than with adenocarcinoma.
Serous Cystadenomas are typically benign tumors. They have a sponge-like improvement and can be bulky. They are filled with watery liquid, while mucinous cystadenomas are filled with a thicker sticky fluid. Serous cystadenomas consist of singular or complicated cysts averaging 5-8 cm and upwards to 25 cm in diameter. Papillary Tumors are rare with a preference for young women in general between 19 -50 years old. It is a large round well defined mass greater than 5 cm. It has an optimistic outcome of colse to 95% 5-year survival.
Sarcomas are rare tumors of the mesenchymal supporting structures of the pancreas. It arises from the tissue that holds the cells of the pancreas together. Medullary Carcinoma is more tasteless in women who have Brca 1 mutation. Medullary carcinomas are more recently described as a variant of pancreatic adenocarcinomas.
Clear Cell Carcinoma is a variant of a pancreatic ductal carcinoma is not well known. It has a exact biomarker hepatocyte nuclear factor-1beta. The tumors appear to have abundant cytoplasmic glycogen. Clear cell carcinomas are solid, rod-shaped, and glandular, with leading stromal collagen bonds.
Endocrine Types of Pancreatic Cancer
Neuroendocrine Tumors (Islet Cell Tumors) are rare tumors with only 2500 cases seen every year in the United States. About 50 percent of Islet cell tumors are malignant and are being more readily identified from Ct scans. They form sheets of reddish-brown nodules that range in size from 2mm-1cm. In humans metastasis is rare.
Pancreatic Lymphoma is rare but responds dramatically to chemotherapy. Males appear to be more famed to this type of lymphoma. Pancreatic lymphomas are a large homogeneous mass with extrapancreatic extension.
Paraganglioma is a tumor that originates from paraganglia nueroendocrine cells .The function of paraganglia is suspected to be a function of the detection for oxygen and carbon dioxide levels in the blood.
Mixed Ductal-Endocrine Carcinoma is believed to create from peripheral pancreatic duct epithelia. Muc-4 expression yields a poor pathology for invasive ductal carcinoma. The most frequent mutation is K-ras at codon 12.
Ampullary Carcinoma is extremely small and granular that form in gland-like structures. Whipple surgical operation is tasteless with 18 percent -33 percent 5-year survival. Intrapancreatic tasteless Bile Duct Cancer constitutes 25 percent of distal bile duct cancers.
Types of Pancreatic Cancer
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