title: Pulmonary tumor diagnosed as an undifferentiated sarcoma with epithelioid features: a case report.
abstract: BACKGROUND
  Pulmonary sarcomas are uncommon accounting for 0.5 % of all primary lung cancers. Undifferentiated sarcomas account for up to 20 % of soft tissue sarcomas. A lung tumor revealed to be an undifferentiated sarcoma with epithelioid features has never been reported in the literature.
  
  
  METHODS
  A 61-year-old white Moroccan man presented with 2 months' history of hemoptysis and dyspnea. Chest computed tomography showed a cystic mass involving the lower field of his right lung evoking first a hydatid cyst. Abdominal computed tomography revealed bilateral adrenal nodules. Surgical resection of the lung mass was performed. On pathological examination, the tumor was cystic containing necrotic material. A histological diagnosis of undifferentiated sarcoma with epithelioid features was made. A positron emission tomography scan showed involvement of his pleura, left colon, adrenal glands, left thigh muscle, and leptomeninges.
  
  
  CONCLUSIONS
  Undifferentiated sarcoma with epithelioid features is a rare malignant mesenchymal tumor. Clinical and radiological features are not specific. A differential diagnosis includes sarcomatoid carcinoma, malignant mesothelioma, melanoma, and other epithelioid sarcomas.
authors.affiliation: Department of Pathology, Mohamed V Military Hospital, Hay Riad, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco. elochi20@yahoo.fr.
authors.forename: Mohamed Réda
authors.initials: MR
authors.lastname: El Ochi
authors.affiliation: Department of Thoracic Surgery, Mohamed V Military Hospital, Hay Riad, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco.
authors.forename: Mohammed Massine
authors.initials: MM
authors.lastname: El Hammoumi
authors.affiliation: Department of Nuclear Medicine, Mohamed V Military Hospital, Hay Riad, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco.
authors.forename: Abdelhamid
authors.initials: A
authors.lastname: Biyi
authors.affiliation: Department of Pathology, Mohamed V Military Hospital, Hay Riad, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Allaoui
authors.affiliation: Department of Thoracic Surgery, Mohamed V Military Hospital, Hay Riad, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco.
authors.forename: El Hassane
authors.initials: EH
authors.lastname: Kabiri
authors.affiliation: Department of Pathology, Mohamed V Military Hospital, Hay Riad, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco.
authors.forename: Abderrahman
authors.initials: A
authors.lastname: Albouzidi
authors.affiliation: Department of Pathology, Mohamed V Military Hospital, Hay Riad, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Oukabli
mesh_terms: D014408:Biomarkers, Tumor; D003937:Diagnosis, Differential; D004417:Dyspnea / Q000000981:diagnostic imaging* / Q000209:etiology; D006469:Hemoptysis / Q000000981:diagnostic imaging* / Q000209:etiology; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography; D012509:Sarcoma / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor
keywords: Epithelioid; Lung; Sarcoma; Undifferentiated