Related Experiment Video
Updated: Sep 15, 2025
Surgical Treatment of an Endolymphatic Sac Tumor
Published on: May 26, 2023
Parosteal lipoma of the supra-auricular region
Made Ratna Dewi1, Christopher Lauren2, I Nyoman Gde Wahyudana1
1Neurosurgery Division, Department of Surgery, Tabanan General Hospital, Tabanan, Indonesia.
Background:
Parosteal lipomas are rare benign soft-tissue tumors that develop in close association with the periosteum. Skull involvement is exceptionally uncommon, with only a few cases reported in the literature.
Case Description:
A 14-year-old female presented with a slowly enlarging, painless lump above her right ear, first noticed at the age of five. Physical examination revealed a firm, well-defined, immobile mass measuring 2.5 × 1.5 cm in the supra-auricular region. A non-contrast computed tomography scan demonstrated a hypodense mass with thickening of the underlying squamous and mastoid bones, along with mastoid air cell enlargement. Surgical excision was performed for cosmetic reasons and histopathological diagnosis. Intraoperatively, the mass was found to be adherent to the periosteum and underlying bone. Histopathological examination confirmed the diagnosis of parosteal lipoma, showing mature adipose tissue, fibrous tissue, and focal lymphocytic aggregates without signs of malignancy. The patient recovered well postoperatively, with no recurrence or complications over 6 months of follow-up.
Conclusion:
Parosteal lipomas of the skull are exceedingly rare and require clinical suspicion for diagnosis. Imaging aids in preoperative planning, while histopathological assessment confirms the diagnosis. Complete surgical excision is curative, with a favorable prognosis. This case adds to the limited literature on skull-based parosteal lipomas.
More Related Videos
Related Concept Videos
01:11Papillary Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen...
01:27Cranial Bones: Lateral View
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
01:15Reticular Dermis
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...
01:14Cranial Bones: Superior and Posterior View
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...