Pediatric soft tissue tumor of the upper arm with LMNA-NTRK1 fusion

A 6-year-old girl was admitted to our hospital due to the presence of a slow-growing tumor in her right elbow. Biopsy specimens showed a round- to spindle-cell neoplasm with uncertain malignant potential, leading to the decision of surgical resection. Histologically, the resected tumor was encapsulated by fibrous tissue, but focally invaded the surrounding skeletal muscles. The tumor was composed of ganglion-cell-like short spindle cells with lymphocytic infiltration in the collagenous background.

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