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Se presentan cuatro casos clínicos de distinta etiología y en cuya presentación la Hipereosinofihia fue un signo relevante. Los diagnósticos finales fueron los de Toxocanasis, Ascaridiasis, Leucemia Linfocftica Aguda, e Histiocitosis de Células de Langerhans.

Presentamos un caso de tipo ectópico, en un niño de 8 meses de edad que presentó un tumor lateral derecho del cuello. El TIMO ectópico es una patología poco común y su embriogénesis puede explicar un poco su localizaci+on cervical.

We present a case of ectopic thymus in an eight month old male baby, with a right lateral tumor of the neck. Ectopic thymus is a pathology rarely observed, its embryogenesis could explain its cervical localization. X Ray, ultrasonography, IRM, esophagoscophy and laryngoscophy may be helpful in the differential diagnosis with other tumors of the neck. Due to the fact that cystic lesions and neoplasis developments take place, the chosen treatment is the complete chirurgical extirpation. But at the absence of symptoms, no treatments is advisable because eventually the thymus spontaneously involutionates.

We present four clinical cases where eosinophilia was a prominent sign. Final Diagnoses were Toxocariasis, Ascaris Lumbricoides Infection, Acute Lymphocytic Leukaemia and Histiocytosis of Langerhans Cells.