Recurrent Giant Cell Fibroblastoma in an Infant: A Diagnostic Challenge.

Fetal and Pediatric Pathology
Priyanka MaitySabita Patra

Abstract

Background: Giant cell fibroblastoma (GCF) shows a wide spectrum of morphological patterns which may lead to a misdiagnosis of sarcoma. Case Report: This 14- month- old baby was referred to us for recurrent left scrotal embryonal rhabdomyosarcoma (ERMS), first diagnosed at 8 months, status post chemotherapy. Review of previous histology, cytology (with frequent multinucleated floret type giant cells but without cross striations) and immunohistochemistry resulted in the change of diagnosis to GCF. It was re-excised, recurred at 20 months of age, and was again re-excised. The morphology was the same in both recurrences as the original. Conclusion: Despite chemotherapy, the histology of multiple recurrences for GCF remained the same as the original. Cytologically, identification of the multinucleated floret like giant cells without cross striations was helpful in differentiating this lesion from embryonal rhabdomyosarcoma.

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