耳下腺Angiolipomaの1例

ANGIOLIPOMA OF THE PAROTID GLAND, A CASE REPORT

　I．はじめに

　Angiolipomaは通常，躯幹あるいは四肢に生じる稀な疾患である。現在まで本邦での報告例は，われわれの症例を含めて14例のみである。ほとんどが皮膚科からの報告であり，耳鼻咽喉科領域では報告をみない。本症は組織学的に，被膜を有する成熟した脂肪組織成分と血管組織成分よりなる良性の腫瘍である。われわれは最近，耳下腺のangiolipomaの1例を経験した。耳下腺のangiolipomaは，われわれが調べ得た限りでは，その報告例をみない。

　Angiolipomas are located in the subcutaneous tissues, most commonly in the extremities. They were not found to be formed on the face, scalp, palms or the soles of the feet. So far, no report of angiolipoma in the parotid gland is found in the literature.

　A woman, aged 28, complained of a painless swelling under her right ear. On examination, a mobile, painless, elastic soft swelling in the superficial lobe of the right parotid gland just below the right auricle, the size of an egg, was found.

　Under a general anaesthesia an encapsulated tumor 4 cm in diameter was removed from the superficial lobe of the parotid gland.

　Microscopical examination revealed a lipoma.

　Histologically the tumor was encapsulated in a thin connective tissue capsule. The ratio of the adipose to that of the vascular tissues was predominantly lipomatous with a small angiolipomatous foci. The fat cells were unusually mature. In the angiomatous component a few erythrocytes could be seen among the closely aligned capillaries.

　No recurrence occurred postoperatively. Angiolipoma of the parotid gland is very rarely encountered disease.