Intraosseous Calcaneal Lipoma Misdiagnosed as Plantar Fasciitis: An Orthopedic Case From Family Practice

Foot pain is a prevalent musculoskeletal complaint with plantar fasciitis being one of the most common underlying etiologies. Diagnostic imaging studies are rarely performed for patients with plantar fasciitis. We report the case of a 34-year-old woman with a six-month history of left heel pain that was worsened by prolonged standing and walking. She was diagnosed as having plantar fasciitis. Considering the lack of clinical improvement on conservative measures, the patient underwent a plain radiograph, which demonstrated a geographic radiolucent lesion in the calcaneus with well-defined non-sclerotic margins. Subsequently, a computed tomography scan re-demonstrated the lesion as having a fat-attenuation appearance that was classic of lipoma. The patient underwent surgical excision of the tumor and the histopathological examination of the specimen revealed spindle cell lipoma. The patient had complete resolution of the pain following the surgery. Intraosseous lipoma is a very rare benign primary bone tumor. The case demonstrated that the intraosseous lipoma may have similar clinical features to plantar fasciitis. Hence, physicians should keep a high index of suspicion for the alternate diagnoses of plantar fasciitis in patients who do not exhibit any clinical improvement despite a prolonged period of conservative management.