[Idiopathic Diffuse Pulmonary Ossification Diagnosed by Lung Biopsy].

Area of Science:

• Pulmonary Medicine
• Pathology
• Radiology

Background:

• Giant cell tumors of bone are rare bone neoplasms.
• Pulmonary metastases can occur in patients with giant cell tumors.
• Diffuse pulmonary ossification (DPO) is a rare condition characterized by bone formation in the lungs.

Observation:

• A 64-year-old woman presented with diffuse, densely calcified nodular lesions in both lungs on imaging.
• The patient had a history of femoral giant cell tumor resection 35 years prior.
• Pulmonary metastases of the giant cell tumor were initially suspected.

Findings:

• Lung biopsy revealed diffuse pulmonary ossification (DPO) of the dendriform type.
• The diagnosis of idiopathic DPO via lung biopsy is extremely rare.
• The imaging findings mimicked pulmonary metastases.

Implications:

• This case underscores the importance of considering DPO in the differential diagnosis of diffuse lung calcifications, especially in patients with a history of bone tumors.
• Lung biopsy can be crucial for diagnosing rare conditions like DPO.
• Idiopathic DPO diagnosis through lung biopsy is exceptionally uncommon.