Multiple endophytic chondromas Chondromas are one of the most common types of benign bone tumors and usually have two forms, one growing outward from the bone, called exophytic chondromas, and the other growing into the bone, called endophytic chondromas. Multiple chondromas are called Ollier’s disease, and those with multiple hemangiomas are called Maffucci’s syndrome. The clinical features of chondrosarcoma are: (1) the site of predilection is the long tubular bone of the hand and foot, but it can also occur in flat bone, such as scapula or iliac bone; (2) the affected area is swollen, and a slight trauma can cause pathological fracture; (3) X-ray examination shows: a single endogenous chondrosarcoma is an oval transparent dark area with neat edges, bone expansion and thinning, and gravel-like calcified spots scattered within the tumor; multiple endogenous chondrosarcomas It can cause skeletal deformity; (4) pathological examination on the gross specimen, hard and lustrous light blue tissue is visible, microscopically lobulated hyaline cartilage is visible, chondrocytes are homogeneous and pile up, nuclei are uniform in size and staining is not deep; (5) occasionally chondrosarcoma can develop into chondrosarcoma, mostly occurring in larger bone scales.