Angioleiomyoma of the Hindfoot: A Rare Cause of Chronic Heel Pain.

Angioleiomyoma is a benign soft tissue tumor originating from the smooth muscle of vascular structures. Though relatively uncommon, it frequently occurs in the lower extremities and is often misdiagnosed due to its nonspecific clinical presentation. We report the case of a 54-year-old female with chronic posterolateral heel pain initially attributed to insertional Achilles tendinopathy and Haglund's deformity. After failure of conservative management, MRI revealed a well-circumscribed subcutaneous lesion with signal characteristics concerning for a soft tissue neoplasm. Surgical excision was performed, and histopathologic analysis confirmed a venous-type angioleiomyoma, characterized by thick-walled vascular channels and smooth muscle proliferation without atypia. Immunohistochemistry was positive for SMA, weakly positive for desmin, and ERG-positive in the vascular endothelium. The patient experienced complete symptom resolution postoperatively. Although not exceedingly rare, angioleiomyomas remain underrecognized in clinical practice, particularly in the foot and ankle, resulting in diagnostic delays averaging over five years. MRI demonstrated characteristic features described in recent literature, validating its utility in preoperative assessment. This case reinforces the importance of maintaining a broad differential when evaluating chronic, focal heel pain and supports the use of advanced imaging and histopathologic confirmation in atypical cases. Greater awareness of angioleiomyomas can help reduce diagnostic delays and improve outcomes in patients with chronic, unexplained soft tissue pain in the foot and ankle.