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Heterotopic ossification around the lesser trochanter of the femur simulating a malignant lesion. A case report with long-term follow-up and revision of literature
Vol 34, Issue 3S2, 2020
Abstract
We report the case of a 28-year-old female who complained of groin pain and restricted range of motion of the hip for the previous two months. A plain radiograph, CT scan and MRI of the pelvis showed a bone mass of uncertain origin around the lesser trochanter, simulating malignancy. An open biopsy was performed to obtain a correct diagnosis. The histological examination excluded a malignant lesion. Two months later, the mass was surgically excised and at follow-up, 9 years after surgery, the patient was completely asymptomatic, without any radiographic sign of recurrence. This is a rare case of heterotopic ossification of the proximal part of the femur, that appeared without any significant trauma or other predisposing risk factors; because the lesion led us to suspect a malignant disease, an open biopsy was needed to make the diagnosis. From an accurate review of the literature, heterotopic ossifications mimicking a malignant lesion that appeared without any predisposing factors are extremely rare.
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Copyright (c) 2020 A. Caterini, V. Potenza, F.De Maio, M. Marsiolo, A. Corsi, P. Farsetti
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Medical Genetics, University of Torino Medical School, Italy

Department of Biomedical, Surgical and Dental Sciences, University of Milan, Italy