Sternal metastatectomy in a case of papillary thyroid carcinoma.

Thyroid cancer is the most common among endocrine cancers. Over 90% of all thyroid malignancies are differentiated thyroid carcinomas (DTC). However, only 2%-13% of DTC present with bone metastasis.

Rosai-Dorfman disease of the trachea: an extremely rare benign tumor.

Rosai-Dorfman disease or sinus histiocytosis is a nonmalignant disease chiefly presenting as a painless cervical lymphadenopathy, although extranodal involvement is also frequent. Involvement of the tracheobronchial tree is extremely rare, and there are no clear guidelines on management. Rosai-Dorfman disease usually presents as a tracheal tumor, although it may also present with extraluminal compression.

Human pulmonary dirofilariasis masquerading as a mass.

Pulmonary dirofilariasis, caused by Dirofilaria immitis, rarely affects humans and is usually asymptomatic, but may present as chest pain, cough, hemoptysis, wheezing, low-grade fever, and malaise. The dead and dying worms obstruct branches of the pulmonary artery, causing infarction and a granulomatous reaction. Coin lesions are apparent on radiography, raising concern of malignancy.