Authors
Ryo Hashimoto, Tomoki Nakagawa, Yutaka Kurebayashi, Ryota Masuda
Published in
Radiology case reports. Volume 21. Issue 12. Pages 6145-6148. Epub Sep 15, 2026.
Abstract
Nodular pulmonary amyloidosis is a rare, localized form of amyloid deposition in the lung and an uncommon cause of solitary pulmonary nodules. Its radiological features may closely mimic that of primary lung cancer if spiculation or fluorodeoxyglucose uptake is present, making preoperative diagnosis challenging. Here, we report the case of a woman in her 60s who was referred to our hospital after an abnormal opacity was detected by routine chest radiograph. Chest computed tomography revealed a 21 mm × 12 mm solid nodule with partial spiculation in the left lower lobe. Fluorodeoxyglucose positron emission tomography/computed tomography demonstrated mild uptake (maximum standardized uptake value; 2.5). Bronchoscopic biopsy results were inconclusive, and diagnostic video-assisted thoracoscopic left basal segmentectomy was performed because malignancy could not be excluded. Histopathological examination under polarized light microscopy demonstrated Congo red-positive amyloid deposition with apple-green birefringence, confirming nodular pulmonary amyloidosis. This case highlights that nodular pulmonary amyloidosis can mimic primary lung cancer on imaging and diagnostic surgical resection may provide definitive diagnosis and local treatment if bronchoscopic biopsy is inconclusive. Long-term follow-up is warranted, considering its reported association with lymphoproliferative disorders.
PMID:
42781195
Bibliographic data and abstract were imported from PubMed on 25 Sep 2026.
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