Focal fatty infiltration of the liver mimicking a tumor: sonographic and CT features

Area of Science:

• Radiology
• Hepatology
• Medical Imaging

Background:

• Focal fatty infiltration (FFI) is a common benign liver condition.
• It can sometimes present as a focal mass, mimicking neoplastic lesions.
• Accurate differentiation from tumors is crucial for patient management.

Observation:

• An asymptomatic woman presented with a liver lesion detected via ultrasonography (US).
• Computed tomography (CT) revealed a sharply marginated, spherical mass with specific attenuation values (30 HU unenhanced, 50 HU enhanced).
• These imaging characteristics were unusual for typical FFI.

Findings:

• The observed tumor-like liver lesion completely resolved on subsequent US and CT examinations.
• This resolution pattern is atypical for primary or metastatic liver tumors.
• Literature review indicated no prior reports of FFI presenting with these specific imaging features.

Implications:

• The case underscores the necessity of follow-up imaging in diagnosing liver lesions.
• Unusual presentations of FFI can pose diagnostic challenges, requiring careful evaluation.
• Distinguishing FFI from malignant tumors is vital to avoid unnecessary interventions.