'PAR' in PAR 20 or PAR 50 is an acronym standing for Parabolic Aluminized Reflector. This name refers to the construction of the PAR bulb. The bulb traditionally features a tungsten filament surrounded by a reflector with an aluminum coating (hence aluminized). The reflector intensifies the beam and makes it more efficient.
Toe necrosis; Toe ischemia; Amputation; Dry gangrene Abstract Toe necrosis may have vast different etiologies. These include ischemia, embolus, and others. (1) The most common etiology is ischemia. It is a reduction in blood supply to a viable tissue that can lead to susceptibility to infection and tissue death. Peripheral ischemia, which is rooted in the
Bone marrow edema secondary to bone impaction or bone contusions is likely the result of trabecular microfractures, edema, hemorrhage, or reaction after stress. This pattern is common after ankle inversion injuries and is often noted in the apposing medial malleolus and talus.he cause of bone marrow edema is unclear and may include fluid, hemorrhage, fibrosis, and necrosis. Various diseases with confusingly similar or overlapping MRI features can cause ankle and hindfoot bone marrow edema.