폐에 발생한 염증성 가성종양의 세침흡인 세포학적 소견 - 선암종으로 오진한 1예 보고 - = Fine Needle Aspiration Cytology of Inflammatory Pseudotumor of the Lung - Report of A Case Misdiagnosed as Adenocarcinoma -

다국어 초록 (Multilingual Abstract)

Cytologic features of inflammatory pseudotumor of the lung have not been described frequently. We report fine needle aspiration cytologic(FNAC) finding of a case of inflammatory pseudotumor misdiagnosed as adenocarcinoma in a 63-year-old man. The FNAC displayed a mixture of histiocytes, myofibroblasts, pneumocytes, and plasma cells. Some histiocytes and myofibroblasts had large nuclei with irregular nuclear membrane and prominent nucleoli, which mislead the diagnosis on adenocarcinoma on FNAC. The heterogeneous cell population is the unique cytologic features of inflammatory pseudotumor, which are helpful to distinguish it from other circumscribed benign and malignant lesions. Familiarity with these features is essential to avoid misdiagnosis and possible overtreatment.