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Efficacy of Diagnostic Ultrasonography of Lipomas, Epidermal Cysts, and Ganglions
Yoshihiro Kuwano, MD, PhD;
Kazuho Ishizaki, CT;
Rei Watanabe, MD, PhD;
Hiroko Nanko, MD, PhD
Arch Dermatol. 2009;145(7):761-764.
Objective To determine the efficacy of ultrasonography for the diagnosis of subcutaneous benign lesions.
Design Retrospective study.
Setting Tokyo Kousei-Nenkin Hospital, Tokyo, Japan.
Patients The study included 183 patients with subcutaneous benign lesions who underwent ultrasonography and then received a pathologic diagnosis after surgery.
Main Outcome Measures The study evaluated the number of cases in which the preoperative diagnosis after ultrasonography or just after palpation agreed with the pathologic diagnosis.
Results Ultrasonography significantly increased the preoperative diagnostic yield of subcutaneous benign lesions (after palpation, 29%; after ultrasonography, 46%; P < .001). The sensitivity for the diagnosis of lipoma (after palpation, 54.8%; after ultrasonography, 88.1%; P < .01) and the specificity for the diagnosis of epidermal cyst (after palpation, 93.5%; after ultrasonography, 99.3%; P < .05) significantly increased after ultrasonography. The sensitivity for the diagnosis of epidermal cyst and ganglion also tended to increase after ultrasonography.
Conclusion The study results suggest that ultrasonography is useful for the preoperative examination of subcutaneous benign lesions.
Author Affiliations: Departments of Dermatology (Drs Kuwano, Watanabe, and Nanko) and Clinical Laboratories (Mr Ishizaki), Tokyo Kousei-Nenkin Hospital, and Department of Dermatology, University of Tokyo (Drs Kuwano and Watanabe), Tokyo, Japan.
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