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Human anatomy is a variable structure. There are various rare muscle-specific accessory structures. The accessory soleus muscle (ASM) is one of them and was studied in this case report. ASM was seen during routine learning and teaching dissection lessons while dissecting the right leg of a male body. When this muscle was examined, a thick beginning with fascial connections from the soleus muscle, medially in the lower 1/3 of the leg was seen. This unipennate-shaped super numeric muscle had a 3.95 cm width, 25.82 cm length, and 0.82 cm thickness. This muscle, which is seen on radiological images, may often be confused with soft tissue tumors such as ganglion, lipoma, hemangioma, synovioma, and sarcoma, and on the pathology of the muscle may cause pain and tarsal tunnel syndrome-like effects.