A middle-aged female presents with chronic pain in right side of abdomen with intermittent fever. Clinical examination revealed mild hepatomegaly and hence a contrast-enhanced CT abdomen was performed. Based on the imaging characteristics of this focal lesion the most likely diagnosis is?
**Core Concept**
The patient's presentation of chronic abdominal pain, intermittent fever, and hepatomegaly with a focal lesion on CT abdomen suggests a possible diagnosis of a hepatic abscess or a malignant process. The imaging characteristics of the lesion are crucial in differentiating between these possibilities.
**Why the Correct Answer is Right**
The correct answer is likely a hepatic abscess, which is a collection of pus in the liver tissue. This condition is often characterized by a hypoattenuating lesion with peripheral enhancement and a central area of low attenuation on contrast-enhanced CT scans. The peripheral enhancement is due to the presence of a fibrotic wall surrounding the abscess, which contains inflammatory cells and granulation tissue. The central area of low attenuation represents the collection of pus. In contrast, malignant lesions such as hepatocellular carcinoma or metastases typically show homogeneous enhancement or a "target" appearance with a central area of low attenuation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because a simple cyst would not typically present with intermittent fever and would not show peripheral enhancement on CT scans.
**Option B:** This option is incorrect because a hemangioma would typically show homogeneous enhancement and a "light bulb" appearance on CT scans, without a central area of low attenuation.
**Option C:** This option is incorrect because a metastasis would typically show homogeneous enhancement and might not have a significant effect on liver function, leading to hepatomegaly.
**Clinical Pearl / High-Yield Fact**
When evaluating a patient with a focal liver lesion, it's essential to consider the clinical context, including symptoms, laboratory results, and imaging findings. A hepatic abscess is a critical differential diagnosis in patients with fever, abdominal pain, and a focal liver lesion, and prompt treatment is necessary to prevent complications.
**Correct Answer:** A. Hepatic abscess.