J Korean Radiol Soc.  1997 Feb;36(2):277-283.

Radiology of Islet Cell Tumor of Pancreas: Diagnostic Usefulness of Spiral CT

• Kim JS
• Kim YH
• Kim PN
• Ha HK
• Lee MK
• Auh YH

Abstract

PURPOSE
To analysis the radiologic characteristics of a pancreatic islet cell tumor, and to assess the usefulness of spiral CT scanning in the detection of a small tumor.
MATERIALS AND METHODS
We retrospectively reviewed the clinical, pathologic, and imaging features of 12 cases of pathologically-proven islet cell tumors of the pancreas occurring between 1989 and 1995. Imaging study included conventional CT (n=9), spiral CT (n=3), ultrasonography (n=5), MRI (n=4), and angiography (n=6).
RESULTS
Among 12 patients, eight (67%) were diagnosed as suffering from functioning islet cell tumor, and four (33%) as nonfunctioning tumors cases. Of the former, four were insulinoma and one was glucagonoma. Their average diameter was 2.4cm, whereas that of nonfunctioning tumors was 5cm. The average diameter of islet cell tumors was 1.3cm. Using conventional CT (4), spiral CT (3), ultrasonography (3), MRI (1), and angiography (3) preoperative localization was possible. Dynamic spiral CT scans with 5mm slice thickeness were performed in the three cases of smaller tumor (2cm) showded 100% sensitivity.
CONCLUSION
Since nonfunctioning islet cell tumors tend to be large, it is usually possible to detect a tumor by using only ultrasonography or conventional CT scan. In the case of functioning islet cell tumors, however, localization of the lesion requires more complicated imaging studies. Our results show that thin slice spiral CT was valuable in the defection of small functioning tumors and can be the modality of choice for preoperative localization of a pancreatic islet cell tumor.

Keyword

Pancreas, neoplasms; Pancreas, CT

MeSH Terms

Adenoma, Islet Cell*
Angiography
Carcinoma
Colitis
Diagnosis, Differential
Enteritis
Glucagonoma
Humans
Inflammation
Insulinoma
Islets of Langerhans*
Magnetic Resonance Imaging
Mesentery
Mucous Membrane
Pancreas*
Retrospective Studies
Serous Membrane
Tomography, Spiral Computed*
Tomography, X-Ray Computed
Ultrasonography