Case report 676: Malignant granular cell tumor (schwannoma, myoblastoma), disseminated.

A rare case of metastatic, lethal, malignant granular cell tumor is presented in a 77-year-old woman. Metastases involved numerous sites, including the skeleton. The key clinical and pathological findings and differential diagnosis in benign and malignant granular cell tumor were discussed, including a review from the English literature of 23 cases of malignant granular cell tumor. The differential diagnosis was considered in detail.