title: [A case of occult thyroid cancer detected as a solitary nodular lung metastasis].
abstract: An 82-year-old woman was admitted to our hospital with cough and back pain. A chest radiograph showed a solitary nodular lesion in the right lower lung field. It was diagnosed by a transbronchial biopsy as lung metastasis of a papillary adenocarcinoma of the thyroid. However, her cervical CT and ultrasonography showed only a cyst in a right lobe of the thyroid, and its biopsy did not show evidence of malignancy. In addition, multiple bone metastasis and pituitary metastasis were revealed. We therefore diagnosed this case as systemic metastasis of papillary adenocarcinoma of the thyroid. She was given best supportive care and she died seven months later. Autopsy revealed two tiny lesions (3mm and 6mm) in the thyroid right lobe to be papillary adenocarcinoma. We report this case because occult thyroid cancer caused systemic metastasis and the chest X-ray showed lung metastasis from the thyroid cancer as a solitary nodular lesion.
authors.affiliation: Fifth Department of Internal Medicine, Tokyo Medical University.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Itoh
authors.forename: Shuji
authors.initials: S
authors.lastname: Oh-ishi
authors.forename: Seitaro
authors.initials: S
authors.lastname: Senba
authors.forename: Kenji
authors.initials: K
authors.lastname: Nemoto
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Hatao
authors.forename: Naohiro
authors.initials: N
authors.lastname: Shimizudani
authors.forename: Hideki
authors.initials: H
authors.lastname: Adachi
authors.forename: Kouji
authors.initials: K
authors.lastname: Kishi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakamura
authors.forename: Takeshi
authors.initials: T
authors.lastname: Matsuoka
mesh_terms: D000231:Adenocarcinoma, Papillary / Q000175:diagnosis / Q000473:pathology*; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000556:secondary*; D013964:Thyroid Neoplasms / Q000175:diagnosis / Q000473:pathology*