7- 10 There are also a few reports that included electron microscopic and cytogenetic findings of SCL. The clinical and histologic features of SCL have been described previously. This subcutaneous tumor is located most frequently in the upper back and neck and clinically resembles ordinary lipoma. Spindle cell lipoma (SCL) is a slowly growing, benign, solitary tumor usually arising in men ages 40–70 years. 1- 5 Despite the facts that lipomatous tumors are the most common soft tissue tumors and that liposarcomas are one of the most common types of soft tissue sarcoma, 6 only a few reports dealing with the FNA findings from rare benign adipose tissue tumors exist. However, centers from various parts of the world increasingly use FNA cytology as either a substitute for or a complement to surgical biopsy in the evaluation of patients with primary and recurrent and/or metastatic soft tissue tumors. © 2001 American Cancer Society.Īlthough fine-needle aspiration (FNA) cytology is a widely accepted technique for the diagnosis of tumors in different locations, experience in the aspiration of soft tissue tumors remains limited, and histology is regarded as the gold standard for the evaluation of patients with soft tissue tumors. SCL has a characteristic cytologic appearance that, together with clinical data, helps to exclude low-grade liposarcoma as well as other spindle cell and myxoid lesions.
The presence of a myxoid matrix and of mast cells was less specific and occurred in six aspirates. Cytologically, all 12 tumors were characterized by a mixture of mature adipocytes, uniform spindle cells, and collagen bundles and/or fibers in varying proportions. Two patients presented with tumors in atypical locations one in the tongue and one in the cheek. RESULTSĪll of the tumors arose in adults, and 10 tumors developed in the subcutaneous tissue of the neck, back, or shoulder girdle. The objective of this study was to determine cytologic criteria of SCL by reviewing cytologic specimens in 12 patients with SCL who underwent FNA cytology. In addition, radiologic, electron microscopic, and cytogenetic findings were analyzed. FNA findings were evaluated and correlated with histologic features. Twelve patients underwent fine-needle aspiration (FNA) cytology as the primary diagnostic modality before surgery. The cytologic features are poorly defined, and aspirates from SCL may cause diagnostic problems, because SCL shares some features with other fatty/spindle cell or myxoid lesions, benign as well as malignant. Although some studies have addressed the histologic findings of SCL, only a few descriptions of aspiration cytology findings have been published. Spindle cell lipoma (SCL) is a relatively uncommon, benign tumor that usually presents in the subcutaneous fat of adult men.
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