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The Radiological Society of North America 85th Scientific Assembly and Annual Meeting ¹

Image Interpretation Session: 1999

¹ From the Department of Radiology, University of Michigan Health System, 1500 E Medical Center Dr, Ann Arbor, MI 48109-0030. Received October 18, 1999; accepted October 20. Address reprint requests to the author.

View larger version (156K): [in a new window]     Case 1. Sonograms of the pancreas demonstrate a dilated main pancreatic duct, normal pancreatic parenchyma, but no evidence of a pancreatic head mass.

View larger version (155K): [in a new window]     Case 1. Sonograms of the pancreas demonstrate a dilated main pancreatic duct, normal pancreatic parenchyma, but no evidence of a pancreatic head mass.

View larger version (146K): [in a new window]     Case 1. Sonograms of the pancreas demonstrate a dilated main pancreatic duct, normal pancreatic parenchyma, but no evidence of a pancreatic head mass.

View larger version (143K): [in a new window]     Case 1. Contrast-enhanced CT scan shows the dilated pancreatic duct (arrows) and helps confirm the absence of a parenchymal mass.

View larger version (143K): [in a new window]     Case 1. Endoscopic retrograde cholangiopancreatogram demonstrates a filling defect within the dilated pancreatic duct.

View larger version (203K): [in a new window]     Case 1. Ductectatic pancreatic tumor. Low-power photomicrograph (hematoxylin-eosin stain) reveals a villiform, hyperplastic mucinous epithelium lining the pancreatic duct.

View larger version (152K): [in a new window]     Case 2. (a) Nonenhanced CT scan demonstrates a 5-cm mass in the anterolateral aspect of the right kidney. (b) On a contrast-enhanced CT scan, the mass appears homogeneously enhanced, with a sharp zone of transition between the tumor and the normal renal parenchyma. A "claw" sign is present.

View larger version (152K): [in a new window]     Case 2. (a) Nonenhanced CT scan demonstrates a 5-cm mass in the anterolateral aspect of the right kidney. (b) On a contrast-enhanced CT scan, the mass appears homogeneously enhanced, with a sharp zone of transition between the tumor and the normal renal parenchyma. A "claw" sign is present.

View larger version (158K): [in a new window]     Case 2. Selective renal arteriogram of a kidney in another patient demonstrates the hypovascular nature of a juxtaglomerular tumor. (Reprinted, with permission, from Dunnick NR, Hartman DS, Ford KK, Davis CJ, Amis ES. The radiology of juxtaglomerular tumors. Radiology 1983; 147:321-326.)

View larger version (126K): [in a new window]     Case 3. Lateral radiograph of the right knee demonstrates lytic lesions in the anterior aspect of the tibia and inferior portion of the patella. The soft-tissue planes outlining the distal quadriceps tendon are indistinct.

View larger version (128K): [in a new window]     Case 3. Sagittal T1- and T2-weighted MR images of the right (a, b) and left (c, d) knees reveal disruption of the quadriceps tendons (arrow) and multiple focal bone lesions that had low signal intensity with both pulse sequences.

View larger version (137K): [in a new window]     Case 3. Sagittal T1- and T2-weighted MR images of the right (a, b) and left (c, d) knees reveal disruption of the quadriceps tendons (arrow) and multiple focal bone lesions that had low signal intensity with both pulse sequences.

View larger version (131K): [in a new window]     Case 3. Sagittal T1- and T2-weighted MR images of the right (a, b) and left (c, d) knees reveal disruption of the quadriceps tendons (arrow) and multiple focal bone lesions that had low signal intensity with both pulse sequences.

View larger version (131K): [in a new window]     Case 3. Sagittal T1- and T2-weighted MR images of the right (a, b) and left (c, d) knees reveal disruption of the quadriceps tendons (arrow) and multiple focal bone lesions that had low signal intensity with both pulse sequences.

View larger version (105K): [in a new window]     Case 4. Nonenhanced CT images of the chest (a obtained at higher level than b) reveal an anomalous bronchus (arrow) arising from the medial wall of the bronchus intermedius.

View larger version (108K): [in a new window]     Case 4. Nonenhanced CT images of the chest (a obtained at higher level than b) reveal an anomalous bronchus (arrow) arising from the medial wall of the bronchus intermedius.

View larger version (114K): [in a new window]     Case 4. Reconstructed images in the coronal plane (a) and postprocessed with shaded surface display (b) demonstrate the blind-ending anomalous bronchus.

View larger version (111K): [in a new window]     Case 4. Reconstructed images in the coronal plane (a) and postprocessed with shaded surface display (b) demonstrate the blind-ending anomalous bronchus.

View larger version (136K): [in a new window]     Case 5. Sagittal T2-weighted MR image of the cervical spine demonstrates diffuse low signal intensity of the vertebrae.

View larger version (133K): [in a new window]     Case 5. Axial T1-weighted MR images from the same examination as Figure 11, obtained before (a) and after (b) intravenous administration of contrast material, reveal diffuse enhancement of a posterior epidural mass (arrows).

View larger version (135K): [in a new window]     Case 5. Axial T1-weighted MR images from the same examination as Figure 11, obtained before (a) and after (b) intravenous administration of contrast material, reveal diffuse enhancement of a posterior epidural mass (arrows).

View larger version (69K): [in a new window]     Case 5. CT scan of the chest shows expansion of the ribs and adjacent soft-tissue masses representing extramedullary hematopoiesis.

View larger version (141K): [in a new window]     Case 6. Radiographs from a barium swallow examination demonstrate several weblike filling defects arising from the anterior wall of the esophagus.

View larger version (140K): [in a new window]     Case 6. Radiographs from a barium swallow examination demonstrate several weblike filling defects arising from the anterior wall of the esophagus.

View larger version (129K): [in a new window]     Case 7. (a) Preliminary radiograph from an excretory urogram shows dystrophic calcifications (arrows). (b) Radiograph obtained 10 minutes after intravenous administration of contrast material demonstrates normal kidneys and no lesions within the collecting systems.

View larger version (135K): [in a new window]     Case 7. (a) Preliminary radiograph from an excretory urogram shows dystrophic calcifications (arrows). (b) Radiograph obtained 10 minutes after intravenous administration of contrast material demonstrates normal kidneys and no lesions within the collecting systems.

View larger version (155K): [in a new window]     Case 7. Contrast-enhanced CT images (a obtained at a higher level than b) demonstrate an 8-cm retroperitoneal mass that is separated from the left kidney by a thin fat plane but is intimately associated with the left renal vein.

View larger version (155K): [in a new window]     Case 7. Contrast-enhanced CT images (a obtained at a higher level than b) demonstrate an 8-cm retroperitoneal mass that is separated from the left kidney by a thin fat plane but is intimately associated with the left renal vein.

View larger version (92K): [in a new window]     Case 8. Anteroposterior (a) and left posterior oblique (b) radiographs demonstrate a large, lytic, geographic lesion along the anteromedial aspect of the distal left tibia.

View larger version (94K): [in a new window]     Case 8. Anteroposterior (a) and left posterior oblique (b) radiographs demonstrate a large, lytic, geographic lesion along the anteromedial aspect of the distal left tibia.

View larger version (167K): [in a new window]     Case 8. (a) Coronal T1-weighted MR image reveals the mass, which has an intermediate signal intensity. Small skin lesions (arrows) are also apparent. (b, c) On T2-weighted coronal (b) and axial (c) images, the tibial mass has high signal intensity.

View larger version (150K): [in a new window]     Case 8. (a) Coronal T1-weighted MR image reveals the mass, which has an intermediate signal intensity. Small skin lesions (arrows) are also apparent. (b, c) On T2-weighted coronal (b) and axial (c) images, the tibial mass has high signal intensity.

View larger version (122K): [in a new window]     Case 8. (a) Coronal T1-weighted MR image reveals the mass, which has an intermediate signal intensity. Small skin lesions (arrows) are also apparent. (b, c) On T2-weighted coronal (b) and axial (c) images, the tibial mass has high signal intensity.

View larger version (170K): [in a new window]     Case 8. Photograph of the amputated leg reveals a well-defined, lobulated tumor arising from the medullary cavity of the distal tibia.

View larger version (230K): [in a new window]     Case 8. Malignant peripheral nerve sheath tumor. Low-power photomicrograph (hematoxylin-eosin stain) demonstrates the hypercellular spindle cell neoplasm with areas of necrosis (arrows).

View larger version (138K): [in a new window]     Case 9. Lateral chest radiograph demonstrates a soft-tissue mass (arrows) in the trachea.

View larger version (120K): [in a new window]     Case 9. Tomogram of the chest shows the mass (arrows) arising from the lateral wall of the trachea just above the carina.

View larger version (86K): [in a new window]     Case 9. Contrast-enhanced CT scan shows the mass protruding into the trachea. It is inseparable from the esophagus.

View larger version (137K): [in a new window]     Case 9. Axial (a) and coronal (b) MR images of the chest obtained before (a) and after (b) intravascular administration of gadopentetate dimeglumine demonstrate that the mass (arrow) extends beyond the wall of the trachea.

View larger version (148K): [in a new window]     Case 9. Axial (a) and coronal (b) MR images of the chest obtained before (a) and after (b) intravascular administration of gadopentetate dimeglumine demonstrate that the mass (arrow) extends beyond the wall of the trachea.

View larger version (164K): [in a new window]     Case 9. (a) Low-power photomicrograph of the resected specimen demonstrates the polypoid mass extending into the tracheal lumen. (b) High-power photomicrograph demonstrates the whorled pattern of histiocytes and spindle cells.

View larger version (197K): [in a new window]     Case 9. (a) Low-power photomicrograph of the resected specimen demonstrates the polypoid mass extending into the tracheal lumen. (b) High-power photomicrograph demonstrates the whorled pattern of histiocytes and spindle cells.

View larger version (160K): [in a new window]     Case 10. CT scans obtained before (a) and after (b) intravenous administration of contrast material show a large mass deep in the frontal lobe with both solid and cystic components. There is calcification in the posterior portion of the tumor and dense, patchy contrast enhancement.

View larger version (159K): [in a new window]     Case 10. CT scans obtained before (a) and after (b) intravenous administration of contrast material show a large mass deep in the frontal lobe with both solid and cystic components. There is calcification in the posterior portion of the tumor and dense, patchy contrast enhancement.

View larger version (163K): [in a new window]     Case 10. (a) T2-weighted MR image reveals the mass, which has heterogeneous signal intensity. (b, c) Sagittal (b) and coronal (c) T1-weighted images obtained after intravenous administration of contrast material demonstrate the large cystic areas and dense, patchy contrast enhancement.

View larger version (164K): [in a new window]     Case 10. (a) T2-weighted MR image reveals the mass, which has heterogeneous signal intensity. (b, c) Sagittal (b) and coronal (c) T1-weighted images obtained after intravenous administration of contrast material demonstrate the large cystic areas and dense, patchy contrast enhancement.

View larger version (164K): [in a new window]     Case 10. (a) T2-weighted MR image reveals the mass, which has heterogeneous signal intensity. (b, c) Sagittal (b) and coronal (c) T1-weighted images obtained after intravenous administration of contrast material demonstrate the large cystic areas and dense, patchy contrast enhancement.

View larger version (234K): [in a new window]     Case 10. Desmoplastic infantile ganglioglioma. Low-power photomicrograph (trichrome stain) of the resected tumor specimen shows the blue-stained abundant collagen that constitutes the desmoplastic fibrosis of the tumor. Neurons and glial cells are stained red.