Clear Cell Sarcoma of the Tongue on MRI and PET/CT

Clear cell sarcoma-like/malignant gastrointestinal neuroectodermal tumor of the tongue: a clinicopathologic and molecular case report

Malignant gastrointestinal neuroectodermal tumor (M-GNET) and clear cell sarcoma (CCS) of soft tissue represent closely related, extremely rare, malignant mesenchymal neoplasm of uncertain differentiation. Both entities are characterized genetically by the same molecular alterations represented by the presence of EWSR1-ATF1 and, more rarely, EWSR1-CREB1 fusion genes. The latter translocation seems to be more represented in M-GNET that, despite significant morphologic overlap with CCS, tends to lack overt features of melanocytic differentiation. Most M-GNET occur in the lower gastrointestinal tract, whereas occurrence in the upper tract has been reported only exceptionally. The differential diagnosis represents a major challenge, and accurate diagnosis impact significantly on therapeutic planning. We herein report the clinicopathologic features of a molecularly confirmed M-GNET that arose at the base of the tongue and review the pertinent literature.

Primary clear cell sarcoma in the lung apex with spinal metastasis: a fatal outcome

Clear cell sarcoma (CCS) is a rare tumour that manifests in tendons and aponeuroses of the distal extremities and comprises roughly 1% of all soft tissue cancers. Only two cases of a primary CCS arising in the lung have been reported in the literature, and neither were located in the lung apex. We report a case of a primary CCS located in the lung apex that originally presented as ptosis, as well as arm pain and weakness. Distant metastasis was discovered on diagnosis, which led to irreversible paraplegia and death of the patient.