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Type:
Educational Exhibit
Keywords:
Normal variants, Ultrasound, MR, CT, Abdomen, Neoplasia, Cysts
Authors:
Y. Onishi, T. Koyama, A. Okumura, Y. Amoh, T. Fujiwara, K. Nakatani, S. Nakashita; Kurashiki, Okayama/JP
DOI:
10.1594/ecr2015/C-1914
Conclusion
Ⅲ.
Summary/Conclusion
Most of ectopic tissues in the abdomen remain asymptomatic. However,
some conditions may present with acute abdomen or be complicated with secondary malignancies.
Although the clinical diagnosis of ectopic tissue is crucial for avoiding unnecessary surgery,
it is often challenging without knowledge of ectopic tissues,
including their locations,
associated clinical settings,
imaging features,
and diagnostic procedures of choice.
US or CT would be commonly an initial modality of choice for incidentally found abdominal ectopic tissues.
The radiologic suspicion of ectopic or accessory tissue usually depends on the US or CT features,
which is the presence of a mass exhibiting similar attenuation or echogenicity to an abdominal organ.
Dynamic CT is useful in evaluating the degree of enhancement in ectopic tissue,
particularly in ectopic pancreas and spleen.
MRI has an advantage in excellent tissue contrast,
and is beneficial in the comparison of the signal intensity between ectopic tissue and the abdominal organs on several sequences.
Especially when ectopic pancreas is suspected,
MRCP may be beneficial for demonstrating the pancreatic duct in ectopic pancreas.
DWI is also useful in searching for undescended testis.