A case of a pituicytoma is presented that describes the clinical, pathological, and magnetic resonance imaging features of a rare tumor of the neurohypophysis. A 26-year-old woman presented with a 4-month history of dizziness and visual obscuration. A magnetic resonance image revealed a pituitary mass with suprasellar extension. The specimen obtained from a transsphenoidal decompression identified the mass as an astrocytoma of the posterior pituitary (pituicytoma). Immunohistochemical staining was positive for glial fibrillary acidic protein, S-100, and vimentin. Electron microscopy identified intermediate filaments, numerous broad cell junctions, no secretory granules, and two cellular populations with either an electron-dense or lucent cytoplasmic matrix. This case is unique in that other documented cases originating in the posterior pituitary have all been pilocytic astrocytomas, whereas this neoplasm was not a pilocytic variant. This is also the first case in the literature of a pituicytoma documented by magnetic resonance imaging. This report reviews the cytological elements of the neurohypophysis and the origin of pituicytomas and stresses the proper use of the term "pituicytoma" in relation to tumors of the posterior pituitary.

In electrospray printing, a high electric potential is used to atomize a liquid solution containing the print material into a spray of charged microdroplets. Rapid solvent evaporation from the droplets renders a spray of charged dry particles that are directed onto a target substrate to print a film. Here, we report on electrospray printing of polyimide, an important polymer in electronics manufacturing, aerospace, and environmental applications. Using a passive electrostatic funnel to focus the print material, films were printed with thicknesses of more than 15 μm. However, the use of the funnel resulted in a significant amount of material deflected away from the target. The separation distance from the emitter to the target substrate was a key print parameter, resulting in different rates of film growth at different distances. The film growth was asymptotic, leading to self-limiting thickness due to the accumulation of electric charge in the film. The functionality of the printed films was evaluated by measuring their wettability and dielectric strength. The films maintained consistent surface wettability for a range of print conditions and film thicknesses. Weibull reliability analysis was performed for characterizing the dielectric strength of the printed films. The thickest films could sustain the highest applied potentials, exceeding 1 kV; however, the probability of breakdown increased with increasing electric field strength. As a result, thinner films had a greater breakdown electric field strength of ∼142 V/μm.