Imaging features of primary and recurrent intrathoracic synovial sarcoma: a single-institute experience

Akshay D Baheti, Rani Sewatkar, Jason L Hornick, Sachin S Saboo, Jyothi P Jagannathan, Nikhil H Ramaiya, Sree Harsha Tirumani
Clinical Imaging 2015, 39 (5): 803-8

OBJECTIVE: The objective was to study the imaging features of primary and metastatic intrathoracic synovial sarcoma (ISS).

MATERIALS AND METHODS: We reviewed the imaging of 42 patients with ISS (31 pleural, 7 intrapulmonary, 4 mediastinal), with baseline imaging of 19 patients and follow-up imaging in all.

RESULTS: Primary tumors (n=19) were well circumscribed (15/19), homogeneous or heterogeneously enhancing, with mean size 9.1 cm (range: 1.8-25 cm). Recurrent/metastatic disease developed in 28/42 patients (67%). Lung was the most common site of metastases (21/28), with most of them predominantly pleural (11/21). On pathology, 30 patients had monophasic tumors, and 6 each had biphasic tumors and poorly differentiated tumors.

CONCLUSION: Intrathoracic SS most commonly presents as a large heterogeneous pleural mass without associated adenopathy. Lung metastases are often pleural based and ipsilateral.

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