Radiological diagnostics of rare benign bone tumor intraosseous lipoma: Intraosseous lipoma

Abstract

Introduction/Aim: Lipomas are frequent benign tumors; however, they are rarely localized in bone tissue. Osseous lipomas are categorized according to their location into parosteal, intraosseous, and intracortical. The incidence of intraosseous lipomas is 0.1% of all bone tumors. The most frequent location is in the long tubular bones and calcaneus. This case report aims to present the radiological diagnostics of intraosseous lipoma. Case report: 43-year-old patient with Achilles tendon rupture was admitted to the orthopedic clinic. Radiography of left ankle joint detected a radiolucent, well-circumscribed lesion in the anterior aspect of the calcaneus with a sclerotic board. Magnetic resonance imaging (MRI) revealed bone lesion dimension anteroposterior, craniocaudal, and laterolateral 38 x 22 x 37 mm, composed of peripheral adipose tissue and central calcified nidus, which indicate intraosseous lipoma. Based on histopathological findings, necrotic and viable bone tissue with components of mature and necrotic fatty tissue confirmed the diagnose of intraosseous lipoma. Conclusion: Standard radiographs of bone structures, as the first diagnostic procedure, can make suspects of intraosseous lipoma. MRI and multidimensional computerized tomography can further verify and with more details completely characterize, while histopathological verification is the final step in the diagnose of intraosseous lipoma.