History: This image is from a fine needle aspiration biopsy of a lymph node in a patient with lymphadenopathy, joint symptoms, and elevated ACE. What is your diagnosis? Answer: Well-formed granuloma characteristic of sarcoidosis. Comment: This air-dried smear demonstrates well-formed granulomata. The histiocyte nuclei are elongated with a shape reminiscent of a footprint. Their arrangement in granulomata have been described as being like a “dance step diagram”. Case provided by Dr. Sara...

FNA of a pulmonary hamartoma demonstrates a highly distinctive metachromatic matrix, reminiscent of the metachromatic stroma seen in...

History: These images are from a fine needle aspiration biopsy of a lymph node in a patient with lymphadenopathy, joint symptoms, and...