Abstract
Subgaleal lipoma is a benign tumor of adipose tissue. It should be suspected when a semi-spherical avascular mass with well-defined margins, iso- or hyperechoic in most cases, with thin internal echogenic lines parallel to the long axis of the tumor, is observed between the galea aponeurosis and periosteum of the cranial bone. We report a series of cases of three patients who underwent surgical lesion excision and whose histopathological examination findings confirmed the diagnosis of lipoma.Main Teaching Point:The presence of long continuous echogenic lines within a lens-shaped soft tissue mass located beneath the galea aponeurosis may suggest the diagnosis of subgaleal lipoma.
Highlights
Scalp masses are commonly encountered in clinical practice
Lipoma of the scalp can be diagnosed on ultrasound because of its semi-spherical shape and the presence of thin internal echogenic lines parallel to the long axis of the tumor [1]
Subgaleal lipoma is recognized by the location between the galea aponeurosis and the cranial bone, most of them being reported in the forehead [2, 3]
Summary
Scalp masses are commonly encountered in clinical practice. Ultrasound is usually the first imaging technique used to investigate soft tissue masses of the scalp due to its accessibility and affordability. Lipoma of the scalp can be diagnosed on ultrasound because of its semi-spherical shape and the presence of thin internal echogenic lines parallel to the long axis of the tumor [1]. Subgaleal lipoma is recognized by the location between the galea aponeurosis and the cranial bone, most of them being reported in the forehead [2, 3]. We report the imaging findings of subgaleal lipomas in three patients, reviewing the imaging characteristics of these lesions
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