Author of 2 Presentations
SS 4.3 - Imaging differentiation of intraabdominal desmoid tumour from peritoneal seeding in patients with a previous history of cancer surgery
Abstract
Purpose
To investigate whether there are differential imaging features of intraabdominal desmoid tumor from peritoneal seeding in patients with a history of previous cancer surgery.
Material and methods
From January 2000 to June 2019, 32 patients who had pathologically proven intraperitoneal lesions developed after cancer surgery were enrolled. There were 17 desmoid tumors and 16 peritoneal seedings. Portal-phase CT and/or positron-emission tomography (PET) findings were analyzed by two board-certified radiologists in consensus for the following items: size, shape, margin, degree of enhancement and fluorodeoxyglucose (FDG) uptake, homogeneity, presence of intralesional fat, necrosis, calcification, adjacent organ invasion, peritoneal thickening, and mass effect. For quantitative analysis, the Hounsfield unit (HU) of lesions and psoas muscles as well as maximum standardized uptake value (SUVmax) of the lesions were measured. Imaging findings were compared between desmoid tumor and peritoneal seeding groups using statistical analysis methods.
Results
Desmoid tumors frequently showed iso-attenuation (14/17) while peritoneal seeding depicted high attenuation (12/16) compared to psoas muscle (P=0.001). Intralesional fat was more frequently found in desmoid tumors (8/17) than in peritoneal seeding (1/16) (P=0.017). Desmoid tumors frequently showed well-defined margin (9/17) and smooth contour (13/17) whereas peritoneal seeding had ill-defined margin (13/16) and lobuating contour (11/16) (P=0.041 and 0.009, respectively). HU ratio between the lesion and psoas muscle was not significantly different between desmoid tumor (1.15) and peritoneal seeding (1.23) (P=0.570). SUVmax (4.14) of desmoid tumor did not significantly differ from that (5.19) of peritoneal seeding (P=0.519).
Conclusion
Desmoid tumor can be non-invasively differentiated from peritoneal seeding based on CT findings in patients with a previous history of cancer surgery.
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SS 12.2 - Factors influencing the detection rate of transabdominal US for incidentally detected pancreatic cysts: a prospective multicenter study
Abstract
Purpose
To investigate the detection rate of transabdominal US (TAUS) for incidentally detected pancreatic cysts on CT or MRI as well as factors influencing detection rates.
Material and methods
Fifty-seven patients with incidentally detected pancreatic cysts (n = 77, 5mm to 3cm) on CT or MRI were prospectively enrolled at five institutions. TAUS was performed independently by two radiologists and assessed the detection of cysts, their location and size, and the diameter of the main pancreatic duct (MPD). Cyst detection rates according to size, location, multiplicity, and body mass index (BMI) were compared using the Mann-Whitney test. Kappa statistics and interclass correlation coefficient were used to evaluate the inter-observer agreement of cyst detection and consistency of size and diameter of MPD between TAUS and CT/MRI.
Results
Detection rate of pancreatic cysts was 81.8 % (63/77) and 83.1% (64/77) for each radiologist. Detection rate of larger (≥10mm) cysts was significantly higher than smaller cysts (89.0% vs 63.6% for R1; 89.0% vs 68.2% for R2, p< 0.05). Non tail location showed significantly higher detection rate than tail location (89.5% vs 65.0% for R2, p = 0.013) and detection rate was also significantly higher in single than in multiple cysts (90.9% vs 69.7 %, p = 0.018 for R1). However, BMI showed no significant difference. Inter-observer agreement was excellent for cyst size (0.963, 95% CI: 0.943-0.976) and diameter of MPD (0.930, 95% CI: 0.891- 0.956).
Conclusion
TAUS could be a useful surveillance imaging tool for incidentally detected pancreatic cysts on CT or MRI, especially, in single pancreatic cysts of larger (≥1cm) size and non-tail location.
Video-on-demand
Author of 2 Presentations
SS 4.3 - Imaging differentiation of intraabdominal desmoid tumour from peritoneal seeding in patients with a previous history of cancer surgery (ID 696)
Abstract
Purpose
To investigate whether there are differential imaging features of intraabdominal desmoid tumor from peritoneal seeding in patients with a history of previous cancer surgery.
Material and methods
From January 2000 to June 2019, 32 patients who had pathologically proven intraperitoneal lesions developed after cancer surgery were enrolled. There were 17 desmoid tumors and 16 peritoneal seedings. Portal-phase CT and/or positron-emission tomography (PET) findings were analyzed by two board-certified radiologists in consensus for the following items: size, shape, margin, degree of enhancement and fluorodeoxyglucose (FDG) uptake, homogeneity, presence of intralesional fat, necrosis, calcification, adjacent organ invasion, peritoneal thickening, and mass effect. For quantitative analysis, the Hounsfield unit (HU) of lesions and psoas muscles as well as maximum standardized uptake value (SUVmax) of the lesions were measured. Imaging findings were compared between desmoid tumor and peritoneal seeding groups using statistical analysis methods.
Results
Desmoid tumors frequently showed iso-attenuation (14/17) while peritoneal seeding depicted high attenuation (12/16) compared to psoas muscle (P=0.001). Intralesional fat was more frequently found in desmoid tumors (8/17) than in peritoneal seeding (1/16) (P=0.017). Desmoid tumors frequently showed well-defined margin (9/17) and smooth contour (13/17) whereas peritoneal seeding had ill-defined margin (13/16) and lobuating contour (11/16) (P=0.041 and 0.009, respectively). HU ratio between the lesion and psoas muscle was not significantly different between desmoid tumor (1.15) and peritoneal seeding (1.23) (P=0.570). SUVmax (4.14) of desmoid tumor did not significantly differ from that (5.19) of peritoneal seeding (P=0.519).
Conclusion
Desmoid tumor can be non-invasively differentiated from peritoneal seeding based on CT findings in patients with a previous history of cancer surgery.
Video-on-demand
SS 12.2 - Factors influencing the detection rate of transabdominal US for incidentally detected pancreatic cysts: a prospective multicenter study (ID 326)
Abstract
Purpose
To investigate the detection rate of transabdominal US (TAUS) for incidentally detected pancreatic cysts on CT or MRI as well as factors influencing detection rates.
Material and methods
Fifty-seven patients with incidentally detected pancreatic cysts (n = 77, 5mm to 3cm) on CT or MRI were prospectively enrolled at five institutions. TAUS was performed independently by two radiologists and assessed the detection of cysts, their location and size, and the diameter of the main pancreatic duct (MPD). Cyst detection rates according to size, location, multiplicity, and body mass index (BMI) were compared using the Mann-Whitney test. Kappa statistics and interclass correlation coefficient were used to evaluate the inter-observer agreement of cyst detection and consistency of size and diameter of MPD between TAUS and CT/MRI.
Results
Detection rate of pancreatic cysts was 81.8 % (63/77) and 83.1% (64/77) for each radiologist. Detection rate of larger (≥10mm) cysts was significantly higher than smaller cysts (89.0% vs 63.6% for R1; 89.0% vs 68.2% for R2, p< 0.05). Non tail location showed significantly higher detection rate than tail location (89.5% vs 65.0% for R2, p = 0.013) and detection rate was also significantly higher in single than in multiple cysts (90.9% vs 69.7 %, p = 0.018 for R1). However, BMI showed no significant difference. Inter-observer agreement was excellent for cyst size (0.963, 95% CI: 0.943-0.976) and diameter of MPD (0.930, 95% CI: 0.891- 0.956).
Conclusion
TAUS could be a useful surveillance imaging tool for incidentally detected pancreatic cysts on CT or MRI, especially, in single pancreatic cysts of larger (≥1cm) size and non-tail location.