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Lung cancer most commonly metastasizes to the brain, bones, liver, and adrenal glands. [14] Lung cancer can often appear as a solitary pulmonary nodule on a chest radiograph or CT scan. In lung cancer screening studies as many as 30% of those screened have a lung nodule, the majority of which turn out to be benign. [15]
Metastasis is the most common cause of brain cancer, as primary tumors that originate in the brain are less common. [4] The most common sites of primary cancer which metastasize to the brain are lung, breast, colon, kidney, and skin cancer. Brain metastases can occur months or even years after the original or primary cancer is treated.
Most patients with limited-stage small cell lung cancer will receive a CT scan of the chest and abdomen to search for abnormality within the lungs and lymph nodes, as well as abnormal areas in more distal organs such as adrenal glands and liver that might arise from the metastasis of lung cancer. [15]
Small-cell lung carcinoma (SCLC) has long been divided into two clinicopathological stages, termed limited stage (LS) and extensive stage (ES). [8] The stage is generally determined by the presence or absence of metastases, whether or not the tumor appears limited to the thorax, and whether or not the entire tumor burden within the chest can feasibly be encompassed within a single radiotherapy ...
A theory was developed that the brain was likely a pharmacologic sanctuary where sub-clinical metastases were protected from cytotoxic drugs by the blood–brain barrier. Oncologists hypothesized that treatment of this sub-clinical disease with radiation therapy may stamp out the malignant process before it could advance to cause symptoms.
A case of a brain metastasis from a giant-cell lung carcinoma (both "pure") tested positive for cytokeratins AE1/AE3, and negative for CK-7, CK-20, TTF-1, and GFAP. [18] GCCL cells often stain intensely by Periodic acid-Schiff reagent, suggesting the presence of significant amounts of glycogen in the cell cytoplasm. [15]
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