PMC4899700_01
41-year-old female with lupus erythematosus panniculitis. A. Axial MRI T1 without contrast image at the level of the right accessory parotid shows an ill-defined reticulated lesion involving the accessory right parotid gland, with extension into adjacent subcutaneous fat. B. Axial MRI T2 image shows high signal intensity in the right peripartoid fat. The right parotid itself does not appear hyperintense. C. Axial MRI T1 postcontrast, fat-saturated image shows high signal intensity and marked homogeneous enhancement in the right accessory parotid, with extension into the adjacent subcutaneous fat.
gr1.jpg
PMC4899700_01_gr1.jpg
fig1
T1 images showed an ill-defined reticulated lesion involving the accessory right parotid gland, with extension into adjacent subcutaneous fat and anterior buccal space (Fig. 1A). T2 images showed a parotid mass that was isointense to the parotid (Fig. 1B). The postcontrast, fat-suppressed T1W images showed dense focal enhancement of the mass compared to the surrounding parotid gland and periparotid fat (Fig. 1C). There was no evidence of restricted diffusion or perineural spread.
41-year-old female with lupus erythematosus panniculitis. High-power view demonstrating a lobular panniculitis composed of a lymphohistiocytic infiltrate with occasional plasma cells and with associated hyaline fat necrosis (asterisks), mucin deposition (arrowheads), and nuclear dust (arrows) (400X; hematoxylin and eosin).
gr2.jpg
PMC4899700_01_gr2.jpg
fig2
A larger needle/punch biopsy histologically demonstrated a panniculitis characterized by a lymphohistiocytic infiltrate including plasma cells, involving fat lobules with associated hyaline fat necrosis (Fig. 2).