PMC4533430_01
(Patient 1) Computed tomography after myelography showed a bony tumor (arrow) with cortical and medullary continuity with inferior articular process of the right L4 vertebra (a). The lesion contained central cancellous bone (asterisk) displaying high signal intensity in T2-weighted image (b).
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F1
Computed tomography after myelography (CTM) showed a high density mass with medullary continuity between the tumor and the vertebra arising from right L4 inferior articular process, projecting into spinal canal (Fig. 1a). The lesion contained central cancellous bone displaying high signal intensity in T2-weighted image (Fig. 1b).
PMC4533430_02
(Patient 2) Computed tomography after myelography showed a bony mass (arrow) with cortical and medullary continuity with superior articular process of the right S1 vertebra (a). Magnetic resonance imaging showed a high intensity cancellous area (asterisk) in T2-weighted image (b).
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F2
CTM showed a bony mass with cortical and medullary continuity with superior articular process of the right S1 vertebra (Fig. 2a). T2-weighted image (Fig. 2b).
PMC4533430_03
PMC4533430_04
(Patient 4) Computed tomography after myelography showed a small bony tumor (arrow) with cortical and medullary continuity with inferior articular process of the right L4 vertebra (a). Magnetic resonance imaging showed a high intensity cancellous area (asterisk) in T2-weighted image (b).
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F3
CTM showed a small bony tumor arising from inferior articular process of the right L4 vertebra (Fig. 3a). MRI showed a high signal intensity medullary area within the tumor arising from right L4 inferior articular process (Fig. 3b).
(Patient 4) A macroscopic photograph of the surface of the tumor. The tumor is covered with a smooth cartilaginous capping (a). A photomicrograph showing cartilaginous capping ( ), the mature trabecular bone ( ) and fatty bone marrow (asterisk) (H & E, original magnification x10, b). Postoperative computed tomography (19 months) scan shows the absence of tumor recurrence (c).
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F4
The tumor with smooth surface was meticulously resected via a right partial hemilaminectomy at the L4-5 level (Fig. 4a). Histological diagnosis was OC (Fig. 4b). At the 19 months follow-up, the postoperative course was uneventful (Fig. 4c).
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