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Lung osteoma--a new benign lung lesion.
Eva Markert1, Ulrike Gruber-Moesenbacher, Christian Porubsky
1Institute of Pathology, Laboratories for Molecular Cytogenetics, Environmental and Pulmonary Pathology, Medical University of Graz, Auenbruggerplatz 25, Graz 8036, Austria.
Virchows Archiv : an International Journal of Pathology
|April 28, 2006
Summary
This report details the first known case of an extraskeletal osteoma in the lung. This rare bone tumor was found in a patient post-bone marrow transplant, presenting as a solitary mass.
Area of Science:
- Pulmonology
- Oncology
- Pathology
Background:
- Extraskeletal osteomas are rare bone tumors typically found outside the skeleton.
- Previous literature has not documented extraskeletal osteomas occurring within the lung.
- Differential diagnoses for lung tumors with osseous elements include hamartoma, amyloid tumor, and osseous metaplasia.
Observation:
- A solitary, well-circumscribed tumor was identified in the right middle lobe of a 39-year-old male.
- The patient had a history of multiple myeloma treated with autologous bone marrow transplantation.
- Histopathological examination revealed mature bone trabeculae, fatty tissue, and areas of new bone formation, encapsulated by a fibrous capsule.
Findings:
- The resected lung tumor was consistent with an extraskeletal osteoma, lacking features of hamartoma, amyloid tumor, or osseous metaplasia.
- Immunohistochemical analysis showed positive osteonectin staining within the osseous elements and negative calcitonin staining.
- This represents the first reported instance of an osteoma occurring in the lung.
Implications:
- This case expands the known locations for extraskeletal osteomas.
- The tumor's potential origin from circulating stem cells, possibly related to the bone marrow transplantation, is discussed but unproven.
- Further research may be needed to understand the etiology and potential triggers for extraskeletal osteomas in unusual locations like the lung.