Granular Cell Tumour of the Chest Wall: FNA Diagnosis with a Review of Literature and Elaboration of Cytological Mimickers

Granular Cell Tumours (GCTs) are uncommon tumours which can be confused with other benign soft tissue tumours on clinical examination. Fine Needle Aspiration Cytology (FNAC) plays a significant role in their diagnosis. There are certain cytological mimickers of GCTs so a cytopathologist must be aware of its characteristic cytomorphology. These tumours can be present anywhere on the body; however, chest wall is one of the uncommon sites. We present a case of GCT present on the chest wall in an elderly male as a subcutaneous nodule. We have discussed the common cytological differential of GCTs, features of malignant GCTs along with cytomorphological and immunohistochemical features.