Article Figures & Data
Figures
- Fig 1.
MR imaging in a patient with Langerhans cell histiocytosis. Axial T1- (A) and T2-weighted (B) images reveal multiple FFLs. An enhancing solid soft-tissue component is seen medially on postcontrast axial (C) and coronal (D) T1-weighted images.
- Fig 2.
CT and MR imaging findings in a patient with an aneurysmal bone cyst. Coronal CT scan (A) reveals marked bone expansion by a well-defined cystic-appearing mass projecting into the left temporal fossa with very thin remnants of the bony cortex seen in the wall (arrows). T2-weighted (B) and precontrast T1-weighted (C) images reveal multiple FFLs. Peripheral and septal enhancement is noted on CT (A) and postcontrast T1-weighted images (D), but no large enhancing solid soft-tissue component is identified.
- Fig 3.
CT and MR imaging findings in a patient with Langerhans cell histiocytosis. Noncontrast CT (A) reveals a lytic lesion with a prominent soft-tissue component and well-defined bone destruction. An FFL is faintly seen (arrow). T2-weighted image (B) and postcontrast T1-weighted image (C) show a few FFLs and enhancement of soft-tissue components, respectively. Axial T2-weighted image (D) following chemotherapy now reveals an increase in the number of FFLs.
- Fig 4.
MR imaging findings in a patient with neuroblastoma demonstrate typical bone marrow infiltration and expansion by metastases (A). Multiple small FFLs are seen in the lesions (B).
- Fig 5.
MR imaging of a 3-month-old patient found to have a bump on the head on physical examination. T2-weighted axial image shows an FFL within a cephalohematoma (arrow), confirmed to be within the bone on multiple planes and sequences (not shown).
Tables
Demographic, clinical, imaging, and histopathologic findings of pediatric patients with FFLs in skull lesions
Patient Sex Age (yr) Location CT No. of FFLs on CT MRI No. of FFLs on MRI History of Trauma Histopathology Final Diagnosis 1 M 4 Right parietal NCCT 9 CE MRI 17 Minor head trauma LCH LCH 2 F 0.75 Occipital – N/A CE MRI 2 − LCH LCH 3 F 13 Left temporal CECT 3 CE MRI 19 − ABC ABC 4 F 10 Left parietal NCCT 0 CE MRI 1 Forceps delivery None Cephalohematoma 5 M 0.25 Left parietal – N/A CE MRI 4 − None Cephalohematoma 6 M 1.5 Sphenoid – N/A CE MRI 2 − None Neuroblastoma 7 F 12 Left frontal NCCT 3 CE MRI 5 Minor head trauma LCH LCH 8 M 11 Left temporal CECT 2 CE MRI 6 − ABC in the setting of fibrous dysplasia ABC 9 M 0.5 Left orbit CECT 1 CE MRI 14 − LCH LCH 10 M 0.02 Right parietal – N/A CE MRI 3 + None Cephalohematoma 11 F 16 Right occipital and temporal NCCT 7 CE MRI 29 − ABC ABC Note:—CECT indicates contrast-enhanced CT; CE, contrast-enhanced; −, none; +, positive for trauma; N/A, not applicable.
