A rare, benign cartilaginous bone tumor typically found within an epiphysis or apophysis in the knee that is more common in male patients ages 5-25 is __________.

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The description fits chondroblastoma, a rare, benign cartilaginous bone tumor that is commonly found in the epiphysis or apophysis of the knee and is more prevalent in male patients aged 5-25. Chondromyxoid fibroma is also a benign cartilaginous bone tumor but is more commonly found in the long bones of the extremities, while aneurysmal bone cyst can appear anywhere in the body and fibrous dysplasia usually affects the femur, tibia, and skull bones.

A Rare, Benign Cartilaginous Bone Tumor Typically Found Within an Epiphysis