There are very few case reports of iatrogenic bone marrow granuloma induced by allopurinol. Granulomas are a rare finding on bone marrow biopsies and can have numerous etiologies, namely infectious, neoplastic, autoimmune, drug related or sarcoidosis. In the absence of pathognomonic features, the combination of clinical, laboratorial, image and histological data is essential to establish a diagnosis. We report ...