Tenosynovial Giant Cell Tumor in an Infant

Abstract

In this report, the authors describe a child presenting at 6 months old with a rapidly expanding extracranial left temporal mass concerning for malignancy. The mass was successfully treated at 16 months with radical surgical excision. The patient was found to have a tenosynovial giant cell tumor, diffuse type, completely encased by the temporalis muscle. To our knowledge, this is the first report of a case of diffuse type tenosynovial giant cell tumor in the temporalis muscle, without articular involvement, presenting in an infant.

Dumbbell-type tenosynovial giant cell tumor of the buttocks: a report of two cases

“…This is similar to the region reported in this study, in which one case was located in the medial region of the left lesser trochanter and the deep surface of the gluteus, which was completely extra-articular and did not invade the hip joint, while the other case was located around the greater sciatic foramen in the deep surface of the left gluteus, with a dumbbell-shaped lesion expanding from posterior to anterior and invading the left sacroiliac joint, but no significant association with the joint capsule or bursa was seen. In addition, complete extra-articular TSGCT can also occur in soft tissues such as the pes anserinus tendon, subacromial bursa, temporalis muscle, external auditory canal, and paravertebral muscles ( 3 , 10 - 12 ). The current view is that extra-articular TSGCT may originate from the synovial tissue of the bursa and tendon sheath ( 5 , 13 ).…”