Fibrous Dysplasia with extensive cartilaginous component is a rare variant of Fibrous Dysplasia. The median age of presentation is 30 years. It presents as a well defined expansile, lytic lesion of long bones. Most commonly involving the proximal femur. Histopathologically, it shows lobules of mature appearing cartilage within proliferating fibro-osseous component. Differentiating of FD with extensive cartilaginous component from other benign and malignant cartilaginous tumours is of utmost importance. We are presenting this case here for its rare presentation in the proximal humerus of an elderly patient.

Keywords: Fibrous Dysplasia; Fibrous Dysplasia with extensive cartilaginous component.