title: A rare case of translocation (12;22) (p13;Q) in Ewing's sarcoma.
abstract: Cytogenetic or immunohistochemical studies are often required to differentiate Ewing's sarcoma (ES) from other small round cell tumors. Herein we report a case of 13-year-old boy who presented with a large presacral lesion. Hemogram and biochemical parameters were normal except lactate dehydrogenase showing value of 96.40/IU/L, magnetic resonance imaging of the spine showed a large mass in presacral lesion (8 cm × 7 cm × 9 cm), with destruction of the sacrum (S2 S3 and S4) with interspinal extension. Bone scan showed multiple pelvic bone lesions, radiograph of chest, ultrasound of abdomen, pelvis and electrocardiogram were within normal limits. Bone marrow was not involved. Cells from the fine needle aspirate were cultured for short term using RPMI medium and karyotype obtained showed a t(12;22)(p12;q12) instead of the classic t(11;22). Diagnosis of ES was also confirmed by studies using immunohistochemistry for MIC2 which was positive, synaptophysin was inconclusive and leukocyte common antigen, desmin negative. This case provides evidence of the importance of chromosome 22, in the etiology of the disease.
authors.affiliation: Department of Molecular Medicine, Cytogenetics Laboratory, Al Jawhara Centre, Arabian Gulf University, Manama, Kingdom of Bahrain.
authors.forename: S K Kousar
authors.initials: SK
authors.lastname: Jahan
authors.affiliation: Department of Pathology Cytogenetics Unit, Kidwai Memorial Institute of Oncology, Bengaluru, Karnataka, India.
authors.forename: Mangala Gowri
authors.initials: MG
authors.lastname: Mayanna
authors.affiliation: Department of Pathology Cytogenetics Unit, Kidwai Memorial Institute of Oncology, Bengaluru, Karnataka, India.
authors.forename: B L
authors.initials: BL
authors.lastname: Kavitha
authors.affiliation: Department of Pathology Cytogenetics Unit, Kidwai Memorial Institute of Oncology, Bengaluru, Karnataka, India.
authors.forename: Akkamahadevi
authors.initials: A
authors.lastname: Patil
authors.affiliation: Department of Pathology Cytogenetics Unit, Kidwai Memorial Institute of Oncology, Bengaluru, Karnataka, India.
authors.forename: Prasanna
authors.initials: P
authors.lastname: Kumari
keywords: Cytogenetics; Ewing's sarcoma; karyotype