Such nodes when found in an otherwise healthy population are clinically insignificant and require no further imaging. In general, these nodes are small, measuring less than 5 mm. Incidental finding of mesenteric lymph nodes is common, reflecting more widespread use of thin-collimation MDCT and PACS workstations. Nodes were identified in more than one location in two patients (4%). The pre-aortic lymph nodes are anterior to the abdominal aorta around the visceral branches (celiac, superior mesenteric, and inferior mesenteric arteries). These nodes were identified only at the mesenteric root in 32 patients (68%), only in the mesenteric periphery in eight patients (17%), and only in the right lower quadrant in five patients (11%). Functionally, retroperitoneal lymph nodes are categorized in four subgroups: pre-aortic, right and left lateral aortic, and post-aortic lymph nodes (Figure 6). The mean size of the largest nodes was 4.8 mm (range, 3-9 mm), and the mean size of the nodes found per patient was 3.6 mm (range, 3-6 mm). Twenty-five (53%) of the 47 patients had four or fewer nodes. Of these 47 patients, 22 (47%) had five or more lymph nodes detected. Of the 120 patients with otherwise normal CT scans, 47 had mesenteric lymph nodes greater than 3 mm. All studies were reviewed on a PACS workstation. g., T1w GRE, T2w single-shot TSE), which minimizes respiratory and peristaltic artifacts. Lymph node size, number, and location (central, peripheral, or right lower quadrant) were documented. No oral contrast medium is needed for evaluating abdominal lymph nodes if the system hardware (1.01.5 T) supports fast breath-hold imaging (e. Two radiologists evaluated the images by consensus and recorded the presence of mesenteric lymph nodes greater than 3 mm in the short axis. All imaging was performed using 3.2-mm collimation on MDCT scanners with IV contrast material. Twelve patients were excluded because they had disease processes known to be associated with lymphadenopathy. Swollen axillary lymph nodes can range in size from a small pea to a large grape. The swelling may be unilateral (affecting one armpit) or bilateral (affecting both armpits). We examined the CT scans of 132 consecutive patients (84 men and 36 women age range, 12-90 years mean age, 43 years) who presented to the emergency department after experiencing blunt abdominal trauma. Axillary lymphadenopathy, also known as axillary adenopathy, is characterized by swelling and inflammation of one or more of the 20 to 40 axillary lymph nodes in each armpit. The purpose of this study is to document the incidence of mesenteric lymph nodes in a previously healthy population and to provide guidelines for further management. What to do with these findings has not been well established. Unsuspected mesenteric lymph nodes are frequently found on abdominal CT scans in everyday clinical practice.
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