A pediatric case of mammary analogue XXXX within the parotid.

@entity4166 @entity5 @entity13820 @entity9604 @entity189 @entity2281
@entity189 ( @entity189 ) is a recently described entity in the differential diagnosis of @entity5 . It is notable for a characteristic t(12;15)(p13;q25) translocation that results in a unique fusion protein, @entity9604 - @entity13820 . While several studies have retrospectively identified this translocation in cases previously diagnosed as a different @entity5 , there have been relatively few cases where this translocation was identified on initial pathology results, and fewer still in a pediatric population. We present a case of a 15 year old female with a slowly enlarging, painless, left facial mass. MRI demonstrated a cystic mass extending into the deep lobe of the parotid, and she underwent parotidectomy. The @entity5 cells stained positive for @entity2281 and @entity4166 . @entity9604 translocation was present, confirming the diagnosis. @entity189 is a recently described @entity5 of the salivary glands, which often masquerades as more common primary @entity5 and cysts. More research is needed to characterize the typical behavior of this @entity5 and the optimal treatment regimen. With identification of its characteristic translocation, mammary analogue @entity189 can be easily differentiated from its more prevalent counterparts, and should therefore remain within the differential of the pathologist and head and neck surgeon.
