Background: Uncommon neoplasms seen within the brain include corpus callosum lipoma and pericallosal lipoma. Their percentage of all cerebral tumor lesions is <1%. The development of adipocytes from primitive meninges that persist into adulthood is the root cause of many conditions. Nevertheless, the exact cause of this lesion remains unknown. The Sylvian cistern, superior cerebellar cistern, suprasellar cistern, and quadrigeminal cistern are some other possible sites. Although headache is a rare symptom, many lesions are painless. Case description: These parents took their 6-week-old baby to the doctor because their child had been experiencing nongrowing edema in the frontal region since birth. Upon external inspection, a soft swelling was detected in the midline of the frontal region. To characterize the lesion, ultrasonography (USG) was performed. On USG, a hyperechoic lesion was observed in the midline subcutaneous area of the anterior region. A hyperechoic lesion in the corpus callosum region with a hyperechoic stalk that extended into the subcutaneous region was seen on transcranial ultrasound. The results were validated by magnetic resonance imaging (MRI) scan. A stalk was found to be attached to the corpus callosum lipoma on the MRI, which was located in the frontal region and revealed it on the subcutaneous plane. Dysgenesis of the corpus callosum was also seen. As a result, a diagnosis of corpus callosum dysgenesis and subcutaneous lipoma was rendered. Conclusion: The patient was kept on follow-up as it is an incidental finding. It is important to image any lesion in the head region to rule out the possibility of intracranial extension or intracranial complications.