Trisomy 17 in congenital plexiform (multinodular) cellular schwannoma.

Plexiform (multinodular) cellular schwannomas are rare tumors, not associated with neurofibromatosis type 1, that occur more often in children and can be congenital. Their biology is benign and is characterized by the tendency to recur locally without being metastatic. Cytogenetic studies in adult cases of schwannoma indicate a complete or partial loss of chromosome 22 as the most common abnormality.

Cytogenetic characterization of a fibrous hamartoma of infancy with complex translocations.

Fibrous hamartoma of infancy is a rare pediatric superficial soft tissue lesion. The diagnosis depends on microscopic examination. Conventional cytogenetic analysis has been reported in only two previous cases, which showed apparently balanced translocations with involvement of different chromosomes.

MicroRNA-125b-1 and BLID upregulation resulting from a novel IGH translocation in childhood B-Cell precursor acute lymphoblastic leukemia.

Chromosomal translocations involving the immunoglobulin heavy chain (IGH) locus are common abnormalities in mature B-cell neoplasms. Recent findings have also revealed their significant role in B-cell precursor acute lymphoblastic leukemia. As a rule, IGH translocations generate transcriptional activation of the oncogene localized in the proximity of the breakpoint.

Differential diagnosis of lipoma-like lipoblastoma.

Lipoblastomas are rare benign tumors of white fatty tissue that occur primarily in young children. Occasionally, heterogeneity of morphological appearance and histological overlap with other lipogenic tumors are described. In such cases fluorescence in situ hybridization (FISH) analysis of PLAG1, a gene specifically rearranged in lipoblastoma, is necessary to prevent misdiagnosis.