Reeder C, Pandeya N. Extensor indicis proprius syndrome secondary to an anomalous extensor indicis proprius muscle belly. J Am Osteopath Assoc 1991;91(3):251. doi: https://doi.org/10.7556/jaoa.19220.127.116.11.
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The complaint of dorsal hand pain is common among patients seen in a primary care practice. The differential diagnosis includes tenosynovial disease, ganglion, trauma, and soft-tissue tumors. Rarely is an anomalous muscle an etiologic factor. Reported here is an anomalous indicis proprius muscle that was manifested as a painful dorsal hand mass. Also discussed are the anatomic variations of the extensor indicis proprius syndrome.
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