A case of malignant pleural mesothelioma with osseous and cartilaginous differentiation

Our plain-English summary of A case of malignant pleural mesothelioma with osseous and cartilaginous differentiation, by N. Shiba, M. Kusumoto, K. Tsuta, et al (Journal of Thoracic Imaging, 2011).

The study

• Authors: N. Shiba, M. Kusumoto, K. Tsuta, H. Watanabe, S. Watanabe, N. Tochigi, Y. Arai
• Journal: Journal of Thoracic Imaging
• Published: 2011;26(1):W30-2
• Type of article: Case report
• Cited by: 10 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

A 69-year-old man with a history of exposure to asbestos was admitted because of a chest radiographic abnormality. Subsequent findings from computed tomography and a thoracoscopic biopsy suggested malignant mesothelioma. Punctate calcification was observed in the pleural tumor on computed tomography scanning. The patient underwent pleuropneumonectomy, and the tumor was pathologically diagnosed as malignant mesothelioma, sarcomatoid type with osseous and cartilaginous differentiation. Malignant mesothelioma with osseous and cartilaginous differentiation is a rare condition. Punctate calcification in the pleural mass as a lesion distinct from the pleural plaque may indicate osseous or osteosarcomatous differentiation in malignant mesothelioma.

In plain English

This article was a case report from the National Cancer Center Hospital in Tokyo, Japan, describing one patient. The patient was a 69-year-old man who worked as a building contractor and had been exposed to asbestos for 48 years. The article did not name the fiber type. He had no symptoms but had an abnormal chest x-ray. CT scans showed masses attached to the right pleura. Small, uniform, punctate calcifications, the largest 5 mm across, were scattered through the main tumor. Separate linear calcification appeared in a pleural plaque. Surgeons removed the right pleura and lung along with part of the chest wall. Tissue examination led to a diagnosis of malignant pleural mesothelioma, sarcomatoid type, with bone-forming (osteosarcomatous) and cartilage-forming (chondrosarcomatous) components. Asbestos bodies were found in the lung tissue. The patient developed local recurrence and metastasis and died 19 months after surgery. The authors described this tumor type as rare. They concluded that punctate calcifications inside a pleural tumor, distinct from a pleural plaque, may indicate osseous or osteosarcomatous differentiation in malignant mesothelioma. A single case cannot show how often this happens.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: case report
• Who was studied: One 69-year-old man admitted to the department of thoracic surgery, National Cancer Center Hospital, Tokyo, Japan
• Exposure: Asbestos exposure for 48 years as a building contractor; fiber type not stated
• Main results:
  • CT showed punctate, uniform calcifications (largest diameter 5 mm) scattered throughout the main pleural tumor
  • Linear calcification was also seen in the pleural plaque, separate from the tumor
  • The patient underwent right pleuropneumonectomy with chest wall resection
  • Histology showed sarcomatoid mesothelioma with scattered osteosarcomatous components and focal chondrosarcomatous components
  • Asbestos bodies were detected in the lung tissue
  • The patient developed local recurrence and metastasis and died 19 months after surgery
• The authors' conclusion: The authors concluded that punctate calcifications in a pleural tumor, distinct from pleural plaque, may indicate osseous or osteosarcomatous differentiation in malignant mesothelioma
• Limitations the authors state:
  • In explaining the bone and cartilage formation, the authors stated that an influence of parathyroid hormone could not be excluded

Topics

The National Library of Medicine indexes this study under subjects our site covers: Mesothelioma.

Medical terms in this study, explained in our Lexicon: Pleural Mesothelioma, Thoracoscopic Biopsy, Malignant Mesothelioma, Sarcomatoid, Pleural Plaques.

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