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Intrahepatic calculi: imaging by MR
Abstract:
The magnetic resonance (MR) examinations of six patients with intrahepatic calculi were reviewed retrospectively to 1) determine the ability of MR to demonstrate intrahepatic calculi and 2) assess the MR appearance of the stones. In five out of six cases, MRI demonstrated intrahepatic calculi. In three cases, stones exhibited a low intensity signal on the different spin echo (SE) sequences, as previously described by in vitro and in vivo studies. However in two other cases, a significant signal with short T1 and relatively long T2 relaxation times was noticed. These different features are discussed in relation to chemical and physical differences in intrahepatic calculi and compared with variable CT attenuation values of stones. MRI seems to provide complementary information concerning intrahepatic calculi.
Insights
Magnetic resonance (MR) imaging can detect intrahepatic calculi (stones in the liver). MR imaging shows varied stone appearances, offering complementary diagnostic information.
Area of Science:
- Radiology
- Medical Imaging
Background:
- Intrahepatic calculi present diagnostic challenges.
- Magnetic resonance (MR) imaging is a key modality for evaluating liver conditions.
Observation:
- Retrospective review of six patients with intrahepatic calculi using MR imaging.
- Assessment of MR imaging's ability to demonstrate and characterize these stones.
Findings:
- MR imaging successfully demonstrated intrahepatic calculi in five of six patients.
- Stones appeared as low-intensity signals on spin echo sequences in three cases.
- Two cases showed stones with significant signal, short T1, and long T2 relaxation times.
- Observed variations are discussed concerning stone composition and CT attenuation.
Implications:
- MR imaging provides valuable, complementary information for diagnosing intrahepatic calculi.
- Understanding varied MR signal characteristics aids in stone characterization.
- Further research can refine MR's role in managing intrahepatic calculi.