Jeffrey P. Callen

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Pyoderma gangrenosum (PG) is an idiopathic, inflammatory, ulcerative disease of undetermined cause. The diagnosis is based on clinical and pathologic features and requires exclusion of conditions(More)
The term peripheral ulcerative keratitis represents a spectrum of inflammatory diseases, characterized by cellular infiltration, corneal thinning, and ulceration. Neutrophilic dermatoses are rarely(More)