title: Mediastinal Seminoma with an Elevated Level of Serum Angiotensin-converting Enzyme.
abstract: A 22-year-old man was admitted following the detection of right hilar enlargement during a medical checkup. The patient's serum angiotensin-converting enzyme (ACE) level was abnormally high, and a needle aspiration biopsy showed non-caseating epithelioid cell granulomas. Surgical resection was performed, and the resected specimens showed irregularly shaped seminoma nests with intervening stroma consisting of epithelioid cell granulomas. Furthermore, immunohistochemistry demonstrated ACE expression in the epithelioid cells and some tumor cells. The patient's serum ACE level declined after the surgery and subsequent systemic chemotherapy, indicating the presence of tumor-induced sarcoid-like reactions rather than the coexistence of seminoma and sarcoidosis.
authors.affiliation: Department of Respiratory Medicine, Fukuoka University Hospital, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ishii
authors.forename: Fumiyasu
authors.initials: F
authors.lastname: Igata
authors.forename: Kazuki
authors.initials: K
authors.lastname: Nabeshima
authors.forename: Hisako
authors.initials: H
authors.lastname: Kushima
authors.forename: Kentaro
authors.initials: K
authors.lastname: Watanabe
mesh_terms: D001707:Biopsy, Needle; D006099:Granuloma / Q000209:etiology*; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000628:therapy; D007703:Peptidyl-Dipeptidase A / Q000097:blood*; D018239:Seminoma / Q000150:complications* / Q000175:diagnosis / Q000628:therapy; D013736:Testicular Neoplasms / Q000150:complications* / Q000628:therapy; D055815:Young Adult
chemical_list: D007703:Peptidyl-Dipeptidase A