PMC4300597_01
On anteroposterior (a), lateral (b) views of right knee, there is a large bony excrescence originated from tibial tubercle and is extended toward knee joint between tibia, femur and patella. The lesion is mostly hyperdense containing hypodense lacunae. Its border is crenated. It seems to be intra-articular
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F1
Radiography study: On anteroposterior (AP) [Figure 1a], lateral [Figure 1a] and axial [Figure 1b] views of right knee, there is a large bony excrescence originating from tibial tubercle and is extended toward the knee joint between the tibia, femur and patella.
On axial spiral computed tomography scanning of right knee joint (a-c) without contrast with 3-mm slices (kV = 100, mA = 100), there is a large bony excrescence originated from tibial tubercle and is extended toward knee joint between tibia, femur and patella. The cortex of tibia is in continuation with the cortex of the lesion and the medulla of tibia is also in continuation with that of the lesion
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F2
Computed tomography (CT) scanning study: On axial spiral CT scanning of the right knee joint [Figure 2a-c] without contrast with 3-mm slices (kV = 100, mA = 100), the cortex and the medulla of tibia appears to be in continuation the lesion.
On anteroposterior and lateral views of right knee after surgery, the tumor is completely resected and the joint space is intact
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F3
On AP and lateral views of right knee after surgery [Figure 3], the tumor is completely resected and the joint space is intact.
(a and b) Microscopic examination reveals proliferation in osteoid and chondroid tissue. Lamellar and mature trabeculae of bone are located in the center and are separated by fibro-fatty tissue and capillary vessels. These bony trabeculae are covered by a thick layer of hyaline cartilage. There is no evidence of malignancy and the features are those of benign osteochondroma
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F4
Pathology study: Microscopic examination [Figure 4a and b] reveals proliferation in the osteoid and chondroid tissues.