[Kimura's disease mimicking primary neoplasm of the parotid gland: A case report].

Background: Kimura's disease is an infrequent inflammatory disorder, of unknown etiology, with few reports outside of Asia. It presents as a nodule or tumor predominantly in the postauricular region, neck and parotid gland. It is histologically characterized by follicular hyperplasia with wellformed mantle zones, preservation of nodal architecture, prominent eosinophilic infiltrate in the germinal centers and interfollicular areas; and associated with elevated levels of IgE and peripheral eosinophilia.

[Lymphoma with signet ring morphology: pathology with distinctive differential diagnoses].

Background: Signet-ring cell lymphoma is a rare entity that simulates epithelial neoplasms, sarcomas and reactive histiocytes conditions. It represents a morphological variant of non-Hodgkin's lymphomas, its diagnosis can represent a challenge, therefore it should be considered in complementary studies.

Objective: The aim of this work is to show a case with a very rare morphology and to emphasize the importance of awareness this entity and avoid mistakes in its diagnosis.