Deep Frontal Lipoma With Frontal Bone Invasion: Report of a Rare Case

Abstract

Lipomas are benign masses of fatty tissue, and in the forehead, they may develop in the subcutaneous or deep fat tissue. While subcutaneous lipomas are common, deep forehead lipomas are unusual and rarely invade the underlying bone. Only a few cases have been reported in the literature, and even fewer cases are reported in children. We present a case of a slowly growing frontal mass corresponding to a deep lipoma responsible for frontal bone invasion, resulting in a bony defect reaching the dural space. Through this case, we aim to emphasize forehead lipomas' clinical and surgical characteristics.

Keywords: bone invasion; extra-dural hematoma; forehead lipoma; frontal lipoma; lipoma.

Figure 1. Preoperative image of the patient showing the frontal mass.

Figure 2. CT scan of the head showing the frontal mass.

A: CT scan of the head in the bone window, in an axial plane, showing a well-defined isodense frontal mass (red arrow), with an invasion of the underlying bone resulting in a bony defect. B: CT scan of the head in the brain window, in an axial plane, showing the same lesion (yellow arrow) with no extension to the parenchyma and normal-looking lateral ventricles. C: CT scans 3D reconstruction showing the extent of the bony defect.

Figure 3. Control CT scan of the head showing a right parietal extradural hematoma (black arrow).