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Lung cancer is the leading cause of cancer deaths in males and females in the United States. The incidence of lung cancer is about 60 cases per 100,000. Jones, Clemson University. ISI Journal Citation Reports
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Imaging in Small Cell Lung Cancer: Overview, Radiography, Computed Tomography. Lung cancer is the leading cause of cancer deaths in males and females in the United States. The incidence of lung cancer is about 6. SCLC) accounts for about 1.
Examples of SCLC are presented in the images below. See Small Cell Lung Cancer: Beating the Spread, a Critical Images slideshow, to help identify the key clinical and biologic characteristics of small cell lung cancer, the staging criteria, and the common sites of spread. Also, see the Lung Cancer Staging - - Radiologic Options slideshow to help identify stages of the disease process and Clinical Presentations of Lung Cancer: Slideshow to help efficiently distinguish lung carcinomas from other lung lesions, as well as how to stage and treat them. Historically, the histologic identification of small cell cancer dates back to the 1. This cancer was also noted to occur in patients younger (2. Since that time, many histologic subtypes of SCLC have been found, and attempts have been made to classify this tumor.
However, disagreement regarding the classifications still exists. In 1. 99. 8, the International Association for the Study of Lung Cancer (IASLC) classified SCLC into 3 general histologic subtypes: small, mixed, and combined. According to this classification, the small- cell subtype includes the previous World Health Organization (WHO) variety of oat cell and intermediate types. The mixed variety encompasses mixed cell and large cell cancers. After that report, different treatment options were considered, and surgery alone was found to be an insufficient method of treatment. A better response was obtained with the addition of chemotherapy and irradiation. Because SCLC is considered a systemic disease, the clinical course, prognosis, and treatment options are clearly different from those of other lung cancers.
Clinically, lung cancers are often categorized into SCLC and non- SCLC (NSCLC). SCLC is categorized into 2 stages: limited disease and extensive disease. The disease is termed limited when it is confined to an area of the chest that can be encompassed by a single radiation port; supraclavicular nodes may be included. The disease is called extensive when metastasis outside the thorax is present or when intrathoracic disease cannot be contained in a single radiation port. Patients with SCLC are rarely surgical candidates, and they are usually treated with irradiation and/or chemotherapy. On the contrary, patients with NSCLC are usually evaluated for possible surgical excision, and their disease is staged by using the common tumor, nodes, and metastases (TNM) staging system. Preferred examination.
The usefulness of the various imaging examinations largely depends on the clinical findings at the time of presentation and also on the stage of the disease. Many imaging modalities are used to further evaluate the findings seen on the previous imaging and to determine the stage of the disease. Commonly used imaging modalities start with simple ones, such as chest radiography; progress to more sophisticated modalities, such as computed tomography (CT) scanning and/or magnetic resonance imaging (MRI); and then progress to even more sophisticated and costly ones, such as positron emission tomography (PET) scanning. Install Quality Center Excel Add In more. When the mass or mass effect is visible on a radiograph, the disease is almost invariably in an advanced stage.
Although some institutions use low- dose CT to detect early non. Contrast- enhanced CT is routinely used to further evaluate any suspicious abnormality noted on radiographs. This examination is also routinely used to determine the stage of a known SCLC, to follow up patients after treatment, and to evaluate distant metastatic disease. Although most centers do not routinely use MRI to evaluate the primary lesion in the chest, it may provide useful information in problematic cases of mediastinal invasion. MRI does have a role in ruling out brain metastatic lesions and in differentiating questionable adrenal masses.
In pregnant patients, MRI can also be used instead of CT scanning, to avoid the potential effects of ionizing radiation. It is less commonly used in patients with SCLC because most of these patients are not candidates for surgery. PET is also useful for evaluating cases in which recurrent disease is questionable. Bone scanning is routinely used to evaluate bony metastatic disease. In nuclear medicine, imaging with technetium- 9.
Imaging only shows suspicious abnormalities that are invariably examined at subsequent biopsy to establish the tissue diagnosis. In most cases in which an abnormality is visible on a radiograph, the cancer has already metastasized. Radiography has poor sensitivity and specificity, and almost all suspicious abnormalities require further evaluation with other modalities, most often CT.
CT shows the anatomic details of the lesion well. CT may have lower sensitivity than MRI in detecting mediastinal invasion.