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Click 75 year old man with plasmacell tumor arising from the clivus. Axial contrast enhanced CT scan in bone window (318 mAS, 140 KeV) shows a large lesion involving the clivus and extending to the right petrous apex with extensive bone erosion. A second small lytic lesion with well defined borders in the right mandibolar condyle is also present.

Click 75 year old man with plasmacell tumor arising from the clivus. Axial FSE T2 weighted image (1.5 T, TR 3540 msec, TE 106 msec) shows the presence of large lesion with homogeneous hypointense signal located in the clival region and extending to the right petrous apex (diameter 67x37 mm). There are encasement of the right internal carotid artery and mild compression of the pons. The first diagnostic hypothesis was chordoma in relation to the mass location.

Click 75 year old man with plasmacell tumor arising from the clivus. Axial SE T1 (1.5 T, TR 560 msec, TE 12 msec) without contrast shows a lesion involving the clivus with homogeneous iso-hyperintense signal (diameter 60x37 mm). The sella turcica is also involved but pituitary gland is normally seen.

Click 75 year old man with plasmacell tumor arising from the clivus. Axial FSE T2 weighted image (1.5 T, TR 3540 msec, TE 106 msec) shows the presence of large lesion with homogeneous hypointense signal located in the clival region and extending to the right petrous apex (diameter 67x37 mm). There are encasement of the right internal carotid artery and mild compression of the pons. The first diagnostic hypothesis was chordoma in relation to the mass location.

Click 75 year old man with plasmacell tumor arising from the clivus. Axial Gadolinium-enhanced T1-weighted SE image (1.5 T, TR 560 msec, TE 12 msec) showing a solid well-enhancing mass with extension and erosion of the clivus (diameter 67x37mm). The first diagnostic hypothesis was chordoma in relation to the mass location.

Click 75 year old man with plasmacell tumor arising from the clivus. An axial CT and FDG-PET/CT fusion images, at 60 min. post administration of 248 MBq 18F-FDG. At level of unexpected site of bone involvement, image shows a focal radiotracer uptake on spinous process of seventh thoracic vertebra and on right clavicle.