Abstract
Background : Primary pulmonary meningioma is extremely rare. We report a case of primary pulmonary meningioma based on cytological findings.
Case : A 54-year-old man admitted for abdominal pain was diagnosed with ischemic colitis and treated conservatively. An abnormal shadow in the lower right pulmonary lobe seen in chest computed tomography (CT) necessitated lower right partial thorascopic resection. Imprint cytology showed spindle cell proliferations forming whorls. Tumor cells had round or fusiform nuclei and mild nuclear atypia, with nuclei occasionally showing intranuclear cytoplasmic inclusions and nuclear grooves. Histologically, spindle cells proliferated in a disorderly manner, forming whorls. Stromal fibrosis and psammomatous bodies were also seen. Immunohistochemically, tumor cells showed positive staining for epithelial membrane antigen (EMA), vimentin, keratin, and S-100 protein. Primary pulmonary meningioma was the final diagnosis.
Conclusions : The proliferation of spindle cells and whorls in cytological pulmonary specimens should bring to mind the possibility of primary pulmonary meningioma.
