1) The pathognomonic histopathologic feature of the psammomatous
type is the presence of spherical ossicles, which are similar to psammoma bodies.
We had 6 bony orbital lesions (sphenoid wing meningioma, psammomatous
meningioma of the ethmoid, fibrous dysplasia of superior orbital wall, reparative giant cell granuloma of maxilla, etc.
Useful clues to suspect the diagnosis of Xp11 translocation RCC include younger patient age at diagnosis, stromal psammomatous
calcifications, and negative or weak immunoreactivity with epithelial markers such as cytokeratins and EMA.
melanotic schwannoma, plexiform schwannoma, microcystic/reticular schwannoma are further variants of schwannoma8,9.
Echogenic ovarian foci without shadowing: Are they caused by psammomatous
Generally smaller than mucinous tumors, these are unilocular or multilocular masses of simple fluid without papillary projections but containing psammomatous
Within the ear and temporal bone, meningothelial, psammomatous
, and fibroblastic types are the most common.
The differential diagnoses include pigmented (melanotic) neurofibroma, psammomatous
melanotic schwannoma, and desmoplastic (neurotrophic) melanoma.
Furthermore, there were reported some particular histologic features, like foamy macrophages, papillae formation, focal clear cells in tubules, necrosis, oncocytic tubules, abundant small vacuoles, heterotopic bone formation, psammomatous
calcifications, nodular growth with lymphocytic cuffing .
Neoplastic glands were surrounded by a reactive, desmoplastic stroma with numerous psammomatous
calcifications (Figure 3).
calcification and periodic acid-Schiff stain positive hyaline basement membrane material were observed in the tumour stroma (Fig.
Computed tomography displays bone deformities better, and psammomatous
intratumoral calcification can be seen in spinal meningiomas (11).