Novel case of a granular cell tumour mimicking breast malignancy and a metachronous axillary skin lesion.

Abstract

A 51-year-old woman presented with an asymptomatic screen-detected lesion of the right breast.The core biopsy showed a granular cell tumour (GCT).Twelve months later the woman presented with an incidental finding of a skin lesion in the left axillary fold during her annual breast surveillance review. HistopathologyconfirmedasecondmetachronousGCT.GCTsareanuncommonbenigntumour of Schwann cell origin that can infrequently be multifocal. Due to the non-specific clinical presentation and radiological features,the gold standard of diagnosis relies on histologic assessment. We describe a novel case of metachronous GCT within the breast tissue mimicking a breast malignancy as a mammography screen-detected lesion,followed by a second GCT mimicking a scar lesion on the contralateral axillary fold.