Fig. 10
From: Imaging findings of the orbital and intracranial complications of acute bacterial rhinosinusitis
Pott’s puffy tumour: a) Axial and b) sagittal ceCT image in a soft tissue window showing opacification of the frontal sinus with heterogeneous material (*) and a subperiosteal abscess (white arrow) due to frontal sinusitis. Note the small subdural fluid collection (black arrow) indicating subdural empyema. c) Sagittal T1w ceMRI in another patient showing a large subperiosteal abscess (long arrow), and a large extra-axial empyema (short arrow). d) Axial CT image in a bone window in the same patient showing erosion of the tabula externa (arrow) adjacent to the soft tissue mass, indicative of osteomyelitis of the frontal bone