The thymic tissue revealed homogeneous decrease in intensity on opposed-phase MR images relative to that seen on in-phase images in 15 healthy volunteers and two patients with hyperplastic thymus. Chemical-shift MR imaging may be useful in identifying normal thymic tissue and the hyperplastic thymus in early adulthood.
SUMMARY:IgG4RSD affecting the nasal cavity and paranasal sinuses is extremely rare. A 71-year-old man presented with an invasive mass in the nasal cavity and paranasal sinuses that was confirmed by immunostaining to be IgG4RSD. The occurrence of this disease in the nasal cavity and paranasal sinuses can resemble a malignant tumor on diagnostic imaging.ABBREVIATIONS: IgG4 ϭ immunoglobulin G4; IgG4RSD ϭ immunoglobulin G4Ϫrelated sclerosing disease
Zygomycosis is an opportunistic fungal infection that affects the central nervous system (CNS). In this report, we present three cases of zygomycosis with CNS involvement. In two patients zygomycosis developed after neurosurgery, and in the third patient zygomycosis developed after bone marrow transplantation for leukemia. All patients developed persistent fever and neurological deficits. They presented with progressive cerebral infarction accompanied by hemorrhage. Intraoperative findings and histopathological examinations revealed that zygomycotic hyphae caused mycotic aneurysm, vasculitis, and venous occlusion.
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