title: Calcification in a pineal tumour studied by transmission electron microscopy, electron diffraction and x-ray microanalysis.
abstract: The calcification in a totally calcified pineal tumour was studied. Transmission electron microscopy indicated that the tumour was a pinealoma. The type of calcification was investigated by bright-field and dark-field transmission electron microscopy in addition to electron diffraction and electron-induced x-ray fluorescence. The calcified material consisted predominantly of amorphous calcium phosphate. The type of calcification differs from the normal calcification present in pineal acervuli which consists of crystalline hydroxypatite.
mesh_terms: D001932:Brain Neoplasms / Q000150:complications / Q000648:ultrastructure*; D002114:Calcinosis / Q000209:etiology / Q000473:pathology*; D004577:Electron Probe Microanalysis; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D010871:Pinealoma / Q000150:complications / Q000648:ultrastructure*; D014961:X-Ray Diffraction