| 释义 |
‖ psammoma Path.|psæˈməʊmə|
Pl. -ˈomata.
[mod.L., f. Gr. ψάµµος sand + -ōma as in carcinoma, etc.]
A tumour containing calcareous particles like grains of sand; usually occurring in the membranes or other parts of the brain. Hence psaˈmmomatous a., of or pertaining to a psammoma.
1876tr. Wagner's Gen. Pathol. (ed. 6) 433 Psammoma is a for the most part very vascular tumor..most often of cellulo-sarcomatous nature..distinguished by the constant occurrence of variously abundant, round or rounded concentrically laminated chalky masses. 1899Allbutt's Syst. Med. VIII. 241 Occasionally psammomata are found attached to the choroid plexuses. 1919J. Ewing Neoplastic Dis. xx. 309 In other tumors of nerve-trunks the structure is that of typical perivascular endothelioma as occurring in the dura mater, and psammomatous changes may appear in them. 1974Radiology CXIII. 34/2 The second characteristic of psammomatous calcification is its diffuse extent throughout the abdomen due to serosal and omental implants. |