Partial resection of the proximal lateral tibia. Anatomical orientation not completely sure, clinical description. Parts of tendons and muscles still attached to the periosteum. The cut shows a central tumor, destroying cortical bone and spongiosa.
Additional finding: Histology: Osteoblastoma
Clinical presentation: Periosteal tumor on the proximal lateral tibia (Osteoblastoma).
Benign tumor, structured similar to the spongiosa, deriving from osteoblasts with partial formation of osteoid and party well developed fibroblastic tissue. Can be found in children over 5 years, most common in the second decade of life.