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Multifocal benign notochordal cell tumours

(extra)mammary myofibroblastoma. The common morphological and immunophenotypic features have suggested a possible link between spindle cell lipoma and (extra)mammary myofibroblastoma, also supported by our previous reports of a characteristic (total or partial) loss of 13q in both spindle cell lipoma and mammary as well as extramammary-type myofibroblastoma. The deleted region in our cases contained the FOX1A1 ⁄ 13q14 loci and overlapped with the minimal overlapping region of 13q14, which has been described in spindle cell lipoma and (extra)mammary myofibroblastoma. The finding of the hitherto unreported involvement of 13q14 in cellular angiofibroma suggests not only a morphological but also a genetic similarity between these three types of tumour, suggesting the possibility of including cellular angiofibroma, spindle cell lipoma and (extra)mammary myofibroblastoma in a group of entities that arise from a common stromal precursor cell, which undergoes (myo)fibroblastic or adipocytic differentiation. Such multipotentiality may explain the spectrum of morphological change.