Bilateral hilar lymphadenopathy

Bilateral hilar lymphadenopathy is a bilateral enlargement of the lymph nodes of pulmonary hila. It is a radiographic term for the enlargement of mediastinal lymph nodes and is most commonly identified by a chest x-ray.

Causes
The following are causes of BHL:
 * Sarcoidosis
 * Infection
 * Tuberculosis
 * Fungal infection
 * Mycoplasma
 * Intestinal Lipodystrophy (Whipple's disease)
 * Malignancy
 * Lymphoma
 * Carcinoma
 * Mediastinal tumors
 * Inorganic dust disease
 * Silicosis
 * Berylliosis
 * Extrinsic allergic alveolitis
 * Such as bird fancier's lung
 * Less common causes also exist:
 * Eosinophilic granulomatosis with polyangiitis
 * Human immunodeficiency virus
 * Extrinsic allergic alveolitis
 * Adult-onset Still's disease