Detection Of Calcification

CT is the method best suited for the detection of calcification. Punctate or conglomerate increased densities on CT scans or foci of signal void on MR scans may be seen in trauma, vascular tumors, optic nerve sheath tumors (meningioma), epithelial lacrimal gland tumor (Figure 10.3), and malignant osseous tumors (osteosarcoma).1-4,11,12,24

FIGURE 10.3. Adenoid cystic carcinoma of the lacrimal gland. (A) Coronal CT scan (bone window) showing the highly dense calcification within the tumor. (B) Axial T1-weighted image showing the calcified portion of the tumor as signal void.

FIGURE 10.2. Images of left orbital metastasis from breast carcinoma. The infiltrative lesion produces bone destruction. (A) Contrast-enhanced coronal CT. Bone destruction is well identified as discontinuity of the cortical bone. (B) Contrast-enhanced coronal T1-weighted image. Bone destruction is suggested by discontinuity of the signal void of cortical bone. Meningeal neo-plastic infiltration not seen on CT was identified on postcon-trast MR scans.

FIGURE 10.2. Images of left orbital metastasis from breast carcinoma. The infiltrative lesion produces bone destruction. (A) Contrast-enhanced coronal CT. Bone destruction is well identified as discontinuity of the cortical bone. (B) Contrast-enhanced coronal T1-weighted image. Bone destruction is suggested by discontinuity of the signal void of cortical bone. Meningeal neo-plastic infiltration not seen on CT was identified on postcon-trast MR scans.

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