Curvilinear Pericallosal Lipoma-Case Discussion

Sagital T1 MRI (non fat-sat)

Sagittal section clearly demonstrate the curvilinear morphology and its relationship with the CC

Axial T1 MRI (non-fat-sat)

Axial T1 MRI (non fat-sat)

**Sagittal section clearly demonstrate the curvilinear morphology and its relationship with the corpus callosum

Clinical History: 35-year-old female, incidental finding.

Radiological Findings: A thin, curvilinear T1-hyperintense lesion is observed extending along the callosal sulcus, following the dorsal aspect of the corpus callosum.

The signal characteristics are consistent with fat.

There is no associated corpus callosum agenesis or dysgenesis; the corpus callosum appears normal in morphology and size.

The findings are characteristic of the curvilinear type of pericallosal lipoma.

Diagnosis: Curvilinear Pericallosal Lipoma

Teaching Points:

Pericallosal Lipoma Subtypes:

​There are two distinct morphologic types of pericallosal lipomas:

​Tubulonodular Type: Usually anterior, larger (>2 cm), and frequently associated with significant frontal lobe or corpus callosum anomalies (such as agenesis).

​Curvilinear Type: Usually posterior, thinner, and longer. It is typically seen in patients with a normally developed corpus callosum, as seen in this case.