Langerhans' cell histiocytosis mimicking metastatic carcinoma of the lung.

Langerhans' cell histiocytosis (LCH), previously known as Histiocytosis X, is characterized by abnormal accumulations of large mononuclear cells forming granulomas in various organs, mainly bone, skin and lung. This case report describes a 50-year-old man with a history of left pneumonectomy due to squamous cell carcinoma (SCC). During routine follow up, a CXR showed new parenchymal nodules in the right lung 57 months post treatment.

Endobronchial metastasis of thyroid follicular carcinoma.

Well-differentiated forms of thyroid cancer, including follicular carcinoma, usually have good prognoses. But they are also known to metastasize to the bones, lungs and central nervous system. Endobronchial metastasis is exceptionally rare.