[A rare case of tumor-to-tumor metastasis: secondary deposits of pulmonary adenocarcinoma in a secretory meningioma].

Abstract

Both secretory meningioma and tumour-to-tumour metastasis are rare, and to our knowledge this is the first report of such a rare coincidence. Secretory meningioma can simulate metastases both clinically (extensive oedema, space occupation, carcinoembryonic antigen secretion) and pathologically (secretory inclusions, positivity for cytokeratin 7 and carcinoembryonic antigen and negativity for vimentin), and therefore may cause a special differential diagnostic dilemma.