Plexiform fibrohistiocytic tumor with molecular and cytogenetic analysis.

A child with plexiform fibrohistiocytic tumor is presented, in whom a superficial biopsy was misdiagnosed as an inflammatory granuloma. Cytogenetic analysis revealed a 46,X,del(X)(q13)[3]/46,XX[23] karyotype. However, fluorescence in situ hybridization (FISH) and array-comparative genomic hybridization (CGH) analysis failed to detect any numerical or quantitative genomic anomaly. Because of lack of specific chromosomal hallmarks, a molecular diagnosis of plexiform fibrohistiocytic tumor with the currently available tools is not reliable.