Author(s)

El Fatemi Hinde, Florence Mishellany, Pierre Gimbergues, Frédérique Penault-Llorca

Department of Pathology, Centre Jean-Perrin, Clermont-Ferrand, France.
Department of Pathology, Hassan II Teaching Hospital, Fez, Morocco.
Department of Surgery, Centre Jean-Perrin, Clermont-Ferrand, France.

Introduction: Hyalinizing spindle cell tumor with giant rosettes (HSCT) is a very uncommon mesenchymal tumor that has similar morphological and biological features to the low-grade fibromyxoid sarcoma (LGFMS). Case Report: Reported herein is a case of primary tumour of buttock HSCT that had rare FUS-CREB3L1 fusion transcripts, a product of characteristic chromosomal abnormality t (7; 16) (q33; p11) of HSCT and LGFMS. The patient was a 48-year-old man who had a large solitary mass in the buttock. Histologically, it was composed of bland spindle cells with variable cellularity deposited in a densely hyalinized stroma alternating with myxoid areas. Characteristic collagen rosettes were scattered in the cellular areas. Reverse transcription-polymerase chain reaction (RT-PCR) assay using formalin-fixed, paraffin-embedded tissue detected FUS-CREB3L1 fusion transcripts. In our knowledge is the second case may display a variant FUS/CREB3L1 fusion transcript in international literature. Conclusion: LGFMS and HSCT probably have a wider spectrum of morphologic features than previously thought, the awareness of which will help pathologists to avoid diagnostic pitfalls. Demonstration of the t (7; 16) translocation will help to diagnose difficult cases with unusual histologic features.

Deep Soft Tissue; Fibromyxoid Sarcoma; Hyalinizing Spindle Cell Tumor; RT-PCR; Fusion Transcripts; CREB3L1

E. Fatemi Hinde, F. Mishellany, P. Gimbergues and F. Penault-Llorca, "Molecular Particularity in Rare Tumour of Buttock: Case Report and Literature Review," Open Journal of Pathology, Vol. 2 No. 4, 2012, pp. 143-146. doi: 10.4236/ojpathology.2012.24026.