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Focal pancreatitis mimicking pancreatic mass: magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP) findings including diffusion-weighted MRI.
Acta Radiol. 2008 Jun; 49(5):490-7.AR

Abstract

BACKGROUND

Focal pancreatitis (FP) is a confined inflammation that mimics a pancreatic mass. Its imaging diagnosis is important to avoid unnecessary procedures.

PURPOSE

To describe the spectrum of magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP) and diffusion-weighted MRI (DWI) findings of focal pancreatitis mimicking pancreatic masses.

MATERIAL AND METHODS

Findings of MRI/MRCP including DWI with a b value of 0 and 600 s/mm(2) in 14 patients with pancreatic masses on MRI were retrospectively reviewed and compared to normal pancreas in 14 patients as a control group.

RESULTS

FP revealed hypointense signal intensity (SI) (3/14), hypo- to isointense SI (7/14), or isointense SI (4/14) on T1-weighted images, and hypointense SI (1/14), isointense SI (5/14), iso- to hyperintense SI (7/14), or hyperintense SI (1/14) on T2-weighted images compared to remaining pancreas (RP). MRCP images revealed dilatation of the common bile duct (CBD) and main pancreatic duct (MPD) (5/14), dilatation of the MPD only (3/14), dilatation of the CBD only (3/14), and normal MPD and CBD (3/14). Both FP and RP revealed three types of time-signal intensity curves: 1) rapid rise to a peak, with a rapid decline (FP=2, RP=4), 2) slow rise to a peak, followed by a slow decline (FP=5, RP=4), and 3) slower rise to a peak, with a slow decline or plateau (FP=7, RP=6). Mean apparent diffusion coefficient (ADC) values for FP and RP were 2.09+/-0.18 and 2.03+/-0.2 x 10(-3) mm(2)/s, respectively. ADC values of FP and RP revealed no significant difference.

CONCLUSION

The spectrum of imaging findings of focal pancreatitis on MRI/MRCP including DWI was described. Findings of FP were not distinctive as compared to the remaining pancreas.

Authors+Show Affiliations

Department of Radiology, St. Louis University Hospitals, St. Louis, Missouri 63110, USA. ncbalci@gmail.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18568532

Citation

Momtahen, A J., et al. "Focal Pancreatitis Mimicking Pancreatic Mass: Magnetic Resonance Imaging (MRI)/magnetic Resonance Cholangiopancreatography (MRCP) Findings Including Diffusion-weighted MRI." Acta Radiologica (Stockholm, Sweden : 1987), vol. 49, no. 5, 2008, pp. 490-7.
Momtahen AJ, Balci NC, Alkaade S, et al. Focal pancreatitis mimicking pancreatic mass: magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP) findings including diffusion-weighted MRI. Acta Radiol. 2008;49(5):490-7.
Momtahen, A. J., Balci, N. C., Alkaade, S., Akduman, E. I., & Burton, F. R. (2008). Focal pancreatitis mimicking pancreatic mass: magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP) findings including diffusion-weighted MRI. Acta Radiologica (Stockholm, Sweden : 1987), 49(5), 490-7. https://doi.org/10.1080/02841850802014602
Momtahen AJ, et al. Focal Pancreatitis Mimicking Pancreatic Mass: Magnetic Resonance Imaging (MRI)/magnetic Resonance Cholangiopancreatography (MRCP) Findings Including Diffusion-weighted MRI. Acta Radiol. 2008;49(5):490-7. PubMed PMID: 18568532.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Focal pancreatitis mimicking pancreatic mass: magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP) findings including diffusion-weighted MRI. AU - Momtahen,A J, AU - Balci,N C, AU - Alkaade,S, AU - Akduman,E I, AU - Burton,F R, PY - 2008/6/24/pubmed PY - 2008/7/25/medline PY - 2008/6/24/entrez SP - 490 EP - 7 JF - Acta radiologica (Stockholm, Sweden : 1987) JO - Acta Radiol VL - 49 IS - 5 N2 - BACKGROUND: Focal pancreatitis (FP) is a confined inflammation that mimics a pancreatic mass. Its imaging diagnosis is important to avoid unnecessary procedures. PURPOSE: To describe the spectrum of magnetic resonance imaging (MRI)/magnetic resonance cholangiopancreatography (MRCP) and diffusion-weighted MRI (DWI) findings of focal pancreatitis mimicking pancreatic masses. MATERIAL AND METHODS: Findings of MRI/MRCP including DWI with a b value of 0 and 600 s/mm(2) in 14 patients with pancreatic masses on MRI were retrospectively reviewed and compared to normal pancreas in 14 patients as a control group. RESULTS: FP revealed hypointense signal intensity (SI) (3/14), hypo- to isointense SI (7/14), or isointense SI (4/14) on T1-weighted images, and hypointense SI (1/14), isointense SI (5/14), iso- to hyperintense SI (7/14), or hyperintense SI (1/14) on T2-weighted images compared to remaining pancreas (RP). MRCP images revealed dilatation of the common bile duct (CBD) and main pancreatic duct (MPD) (5/14), dilatation of the MPD only (3/14), dilatation of the CBD only (3/14), and normal MPD and CBD (3/14). Both FP and RP revealed three types of time-signal intensity curves: 1) rapid rise to a peak, with a rapid decline (FP=2, RP=4), 2) slow rise to a peak, followed by a slow decline (FP=5, RP=4), and 3) slower rise to a peak, with a slow decline or plateau (FP=7, RP=6). Mean apparent diffusion coefficient (ADC) values for FP and RP were 2.09+/-0.18 and 2.03+/-0.2 x 10(-3) mm(2)/s, respectively. ADC values of FP and RP revealed no significant difference. CONCLUSION: The spectrum of imaging findings of focal pancreatitis on MRI/MRCP including DWI was described. Findings of FP were not distinctive as compared to the remaining pancreas. SN - 1600-0455 UR - https://www.unboundmedicine.com/medline/citation/18568532/Focal_pancreatitis_mimicking_pancreatic_mass:_magnetic_resonance_imaging__MRI_/magnetic_resonance_cholangiopancreatography__MRCP__findings_including_diffusion_weighted_MRI_ L2 - https://journals.sagepub.com/doi/10.1080/02841850802014602?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -