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Microcystic adenoma of the pancreas: spectrum of computed tomographic findings
Abstract:
Fourteen cases of microcystic adenoma (serous cystadenoma) of the pancreas were reviewed and radiological findings were correlated with pathological specimens. Microcystic adenomas appeared grossly either as solid tumors with innumerable tiny cysts or as honeycombed cystic tumors depending on the size and number of cysts and amount of connective tissue. Dynamic enhanced CT of the tumor reflected the amount of connective tissue and appeared as (a) densely enhanced spongy masses (n = 6: classic appearance); (b) cystic masses with (n = 6) or without (n = 1) enhanced septa; or (c) dense diffusely enhanced mass (n = 1). Ultrasound similarly showed a variety of features such as echogenic masses with or without small cystic portions, multilocular cysts, or mixed hyperechoic and hypoechoic masses. The ultrasonic features mainly reflected the dominant sizes of cysts. Angiography almost always showed inhomogeneously hypervascular masses with tumor vessels. The imaging diagnosis is easy and conclusive in classic subtypes, but a correct diagnosis can be made even in other subtypes. However, mucinous cystic neoplasm can be confused with microcystic adenoma with large cysts and a small amount of connective tissue, and islet cell tumors can be mistaken for microcystic tumors with minute cysts.
Insights
Radiological imaging of pancreatic microcystic adenomas (serous cystadenomas) correlates well with pathological findings. Imaging techniques like CT, ultrasound, and angiography help diagnose these tumors, though differentiation from other pancreatic neoplasms is crucial.
Area of Science:
- Gastroenterology
- Radiology
- Pathology
Background:
- Microcystic adenoma, also known as serous cystadenoma, is a pancreatic tumor with distinct gross pathological features.
- Tumor appearance varies based on cyst size, number, and connective tissue content.
Purpose of the Study:
- To correlate radiological findings with pathological specimens of microcystic adenomas.
- To evaluate the diagnostic capabilities of various imaging modalities for microcystic adenomas.
Main Methods:
- Review of fourteen cases of microcystic adenoma.
- Correlation of radiological findings (dynamic enhanced CT, ultrasound, angiography) with pathological specimens.
Main Results:
- Dynamic enhanced CT showed spongy masses, cystic masses with/without septa, or diffusely enhanced masses.
- Ultrasound revealed echogenic masses, multilocular cysts, or mixed echogenicity, reflecting dominant cyst size.
- Angiography demonstrated inhomogeneously hypervascular masses with tumor vessels.
Conclusions:
- Imaging diagnosis is straightforward for classic microcystic adenoma subtypes.
- Accurate diagnosis is achievable for other subtypes, but differentiation from mucinous cystic neoplasms and islet cell tumors is important.