新澤 真理¹, 伊藤 万寿雄¹, 向島 偕², 石田 秀明¹, 石岡 知憲¹, 中村 純一¹, 長沼 敏雄¹, 森川 パブロ¹, 正宗 研³

Makoto NIIZAWA¹, Masuo ITOH¹, Tsuyoshi MUKOHJIMA², Hideaki ISHIDA¹, Tomonori ISHIOKA¹, Junichi NAKAMURA¹, Toshio NAGANUMA¹, Pablo MORIKAWA¹, Osamu MASAMUNE³

¹ , ²秋田県成人病医療センター消化器科, ³秋田大学第1内科

¹ , ²Department of Gastroenterology, Akita Medical Center, ³First Department of Internal Medicine, Akita University, School of Medicine

キーワード : Ultrasonography, Papillary adenoma, Gallbladder

The sonographic features of gallbladder adenoma (GA) have not been thoroughly reported. In this study, sonograms and histological characteristics were compared in three cases of histologically proven GA, including one case with a small cancer focus within the lesion.
This study revealed that the GA was usually imaged on the sonogram as flat, or mushroom-shaped hypo-or isoechoic polypoid lesion containing small anechoic spots.
Although differential diagnosis of gallbladder polypoid lesions by ultrasound alone remains difficult, sonography assists in distinguishing GA from gallbladder cholesterol polyps, the most common polypoid lesion of the gallbladder, which is usually imaged as multiple hyperechoic lesions containing small, strongly reflective spots.