Book contents
- Frontmatter
- Contents
- List of contributors
- Foreword
- Preface
- Section 1 Shoulder
- Section 2 Arm
- Section 3 Elbow
- Section 4 Forearm
- Section 5 Wrist
- Section 6 Hand
- Section 7 Hip and Pelvis
- Section 8 Thigh
- Section 9 Leg
- Section 10 Ankle
- Section 11 Foot
- Section 12 Tumors/Miscellaneous
- Case 75 Intraosseous lipoma
- Case 76 Lipoma arborescens
- Case 77 Liposarcoma
- Case 78 Mazabraud syndrome
- Case 79 Neurofibromatosis type I (NF I)
- Case 80 Benign peripheral nerve sheath tumors (PNSTs)
- Case 81 Malignant peripheral nerve sheath tumors (MPNSTs)
- Case 82 Synovial sarcoma
- Case 83 Aggressive fibromatosis (desmoid tumor)
- Case 84 Chondrosarcoma
- Case 85 Pigmented villonodular synovitis (PVNS)
- Case 86 Synovial chondromatosis (osteochondromatosis)
- Case 87 Myositis ossificans
- Case 88 Aneurysmal bone cyst (ABC)
- Case 89 Soft tissue hemangioma
- Case 90 Giant cell tumor (GCT)
- Case 91 Ganglion cyst
- Case 92 Chondroblastoma
- Case 93 Hypertrophic osteoarthropathy
- Case 94 SAPHO syndrome
- Index
- References
Case 75 - Intraosseous lipoma
from Section 12 - Tumors/Miscellaneous
Published online by Cambridge University Press: 05 July 2013
- Frontmatter
- Contents
- List of contributors
- Foreword
- Preface
- Section 1 Shoulder
- Section 2 Arm
- Section 3 Elbow
- Section 4 Forearm
- Section 5 Wrist
- Section 6 Hand
- Section 7 Hip and Pelvis
- Section 8 Thigh
- Section 9 Leg
- Section 10 Ankle
- Section 11 Foot
- Section 12 Tumors/Miscellaneous
- Case 75 Intraosseous lipoma
- Case 76 Lipoma arborescens
- Case 77 Liposarcoma
- Case 78 Mazabraud syndrome
- Case 79 Neurofibromatosis type I (NF I)
- Case 80 Benign peripheral nerve sheath tumors (PNSTs)
- Case 81 Malignant peripheral nerve sheath tumors (MPNSTs)
- Case 82 Synovial sarcoma
- Case 83 Aggressive fibromatosis (desmoid tumor)
- Case 84 Chondrosarcoma
- Case 85 Pigmented villonodular synovitis (PVNS)
- Case 86 Synovial chondromatosis (osteochondromatosis)
- Case 87 Myositis ossificans
- Case 88 Aneurysmal bone cyst (ABC)
- Case 89 Soft tissue hemangioma
- Case 90 Giant cell tumor (GCT)
- Case 91 Ganglion cyst
- Case 92 Chondroblastoma
- Case 93 Hypertrophic osteoarthropathy
- Case 94 SAPHO syndrome
- Index
- References
Summary
Imaging description
Intraosseous lipomas present as solitary lesions. Radiographic features often parallel the histologic stage of the lesion. Stage 1 and 2 typically reveal geographic, lytic lesions with well-defined sclerotic margin. The lesions vary in size from 1–9 cm. In stage 3 the radiographic features of the intraosseous lipoma are non-specific. In the calcaneus and the proximal femur the radiographic pattern can be characteristic. More than half the cases show a central calcification or ossification (Figures 75.1 and 75.2). On CT the lesion shows areas of low attenuation ranging between −40 and −60 Hounsfield units (Figure 75.3). The identification of fatty area on CT is diagnostic of intraosseous lipoma. Visualizing fat within these tumors is the primary role of MRI especially in lesions without significant amounts of involution. On MRI the fatty components of the lesion are iso-intense with subcutaneous fat on all sequences. Areas of dystrophic calcification and ossification show low signal intensity on all sequences. Cysts are common within intraosseous lipomas especially in the calcaneus and they show low signal intensity on T1-weighted images and high signal intensity on T2-weighted images (Figure 75.4). On bone scan an intraosseous lipoma may show mild increase in radionuclide uptake or it may be entirely negative.
- Type
- Chapter
- Information
- Pearls and Pitfalls in Musculoskeletal ImagingVariants and Other Difficult Diagnoses, pp. 163 - 166Publisher: Cambridge University PressPrint publication year: 2013