动脉瘤样骨囊肿(Aneurysmal Bone Cyst,简称ABC)多发生于四肢长骨及脊椎,发生在肋骨甚为少见,故常易被误诊为骨巨细胞瘤。我科曾收治2例,术前皆误诊为骨巨细胞瘤,后经病理证实。现将病例报告如下,以提高对本病的认识。病例介绍例1:男性,64岁,一周前右侧胸部针刺样疼痛,胸透发现右第六肋增粗,透光不均,疑新生物于1978年3月14日入院。检查:右侧第六肋腋中线处压痛,局部未扪及包块。X片见“右第六前肋增粗,呈椭圆形膨胀,透光不均, Aneurysmal bone cyst (Aneurysmal Bone Cyst, abbreviated as ABC) mostly occurs in the long bones of the extremities and the spine, and occurs rarely in the ribs, so it is often misdiagnosed as a giant cell tumor of the bone. Our department has been treated in 2 cases, all misdiagnosed as giant cell tumor of bone before surgery, and confirmed by pathology. Case reports are now as follows to raise awareness of the disease. Case Introduction Example 1: Male, 64 years old, a week ago acupuncture-like pain in the right chest, chest thorax found that the right sixth rib thickening, uneven light transmission, suspected new creature was admitted to hospital on March 14, 1978. Check: The right side of the sixth rib cage midline tenderness, partial failure and mass. X film, see "The sixth right front rib is thicker, oval-shaped, uneven light transmission,