Which lesion usually occurs adjacent to the gallbladder fossa and can mimic malignancy?

Which lesion usually occurs adjacent to the gallbladder fossa and can mimic malignancy?

• A. Focal sparing
• B. PCLD
• C. Reidel lobe
• D. Steatosis

Answer: (A)

Focal sparing is a region of preserved normal liver tissue within a diffusely fatty liver, and it most commonly sits adjacent to the gallbladder fossa. In fatty liver, the rest of the liver becomes more echogenic, while this spared area remains less affected, so on ultrasound it can look like a small, well-defined lesion. This appearance can mimic a malignancy, which is why recognizing focal sparing is important—the lesion isn’t a tumor, it’s normal tissue that just didn’t fatten along that spot. Other possibilities don’t fit as well: diffuse steatosis is a uniform increase in echogenicity, not a discrete lesion; a Reidel lobe is an anatomical variant of the liver edge and not a focal pseudolesion that mimics cancer; polycystic liver disease shows multiple cysts rather than a single focal area near the gallbladder fossa.

Focal sparing is a region of preserved normal liver tissue within a diffusely fatty liver, and it most commonly sits adjacent to the gallbladder fossa. In fatty liver, the rest of the liver becomes more echogenic, while this spared area remains less affected, so on ultrasound it can look like a small, well-defined lesion. This appearance can mimic a malignancy, which is why recognizing focal sparing is important—the lesion isn’t a tumor, it’s normal tissue that just didn’t fatten along that spot.

Other possibilities don’t fit as well: diffuse steatosis is a uniform increase in echogenicity, not a discrete lesion; a Reidel lobe is an anatomical variant of the liver edge and not a focal pseudolesion that mimics cancer; polycystic liver disease shows multiple cysts rather than a single focal area near the gallbladder fossa.