A Case of Multiple Intramuscular Lipomas Combined with Nevus Lipomatosus Cutaneous Superficialis

Infiltrating lipoma is a rare, benign soft tissue tumor. Its name originates in its infiltrating growth nature which penetrates the skeletal muscle. Nevus lipomatosus cutaneous superficialis is a very rare skin anomaly characterized by ectopic adipose tissue in the dermis. We experienced a 45-years-old male patient who presented with well-defined, 10x4cm sized scapular mass and 5x4cm sized subscapular mass combined with a brown colored papule on the back. These lesions are well treated by surgical excision. Histopathological findings showed ectopic mature adipose cells in the dermis in nevus lipomatosus cutaneous superficialis and among muscle fibers in infiltrating lipoma. There is no previous report in wihch solitary nevus lipomatosus cutaneous superficialis is combined with lipomas in seperated area. Two diseases have a common that both have infiltrating nature and from this fact we could deduce that nevus lipomatosus cutaneous superficialis is originated from as infiltration to dermis of infiltrating lipoma or vice versa.

INFILTRATING LIPOMA OF THE NECK: A CASE REPORT

A Case of Infiltrating Lipoma Combined with Nevus Lipomatosus Cutaneous Superficialis / 대한피부과학회지

Infiltrating lipoma is one of the most deep-seated benign soft tissue tumor which occupies less than 1% in lipomas. There are two different types of infiltrating lipoma, one intramuscular lipoma, and the other intermuscular lipoma. Nevus lipomatosus cutaneous superficialis is a very rare skin disease which is characterized by the ectopic presence of mature adipose tissue in the dermis. In this disease two clinical types are distinguished: The first classic type is the multiple lesions of zonal distribution usually on the buttocks or on the lower back area. The second type is the solitary papule or nodule with less restricted tendency in its distrubution. We described a 31-year-old man who had a relatively well-defined localized, skin colored, 20x20cm sized, subcutaneous mass partially covered with brown colored papules and plaque on the left subscapular area. The skin lesion began about 11 years ago with brown colored papules and gradually increased in size to 20x20cm mass. Histopathological and clinical findings showed ectopic fat lobules consisted of almost mature cells in the dermis, between the each muscle fibers, and each muscle bundles.