Annulate lamellae in a malignant mesenchymal tumor.
Intracytoplasmic membranous structures, known as annulate lamellae were seen in a malignant mesenchymal tumor. Close relationship with rough endoplasmic reticulum (ER) suggested their origin from ER.
D003593:Cytoplasm / Q000648:ultrastructure; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D005260:Female; D006801:Humans; D008566:Membranes / Q000648:ultrastructure*; D008637:Mesenchymoma / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008875:Middle Aged