FNA in diagnosis of orbital lesions causing proptosis in adults.

The orbit is affected by a wide range of pathologic lesions, for which a morphologic diagnosis is needed to allow adequate therapy. With increasing use of fine needle aspiration (FNA) in diagnostic pathology, the procedure has been applied for the diagnosis of space occupying lesions of the orbit. We present the cytomorphological diagnosis on orbital FNA in adult patients presenting with proptosis. Records of seven adult patients who had presented with proptosis and had undergone orbital FNA were retrieved and analysed. FNA was performed from the palpable mass in six cases and under ultrasound guidance in one case. No complication during or after FNA was reported in any of the cases. Histopathological diagnosis was available in 5 cases. Out of the 7 cases, 3 were non-neoplastic (2 inflammatory lesions, 1 reactive lymphoid hyperplasia) and 4 were neoplastic (2 primary tumors and 2 secondary involvement). Both the primary tumors were non Hodgkin's lymphoma (NHL) B-cell type. Metastases included one case of uterine sarcomatoid carcinoma and one case of secondary involvement by extension of olfactory neuroblastoma. In all the neoplastic cases, cytological diagnosis corresponded with the histopathological diagnosis. It can be concluded that cause of proptosis among adults are different from those among children and include secondary malignancies. FNA is a simple and important preliminary diagnostic modality in the assessment of adult proptosis prior to any surgical intervention.