Visual loss from arterial steal in patients with maxillofacial arteriovenous malformation.

Objective: To determine whether an arterial "steal" from the ophthalmic artery accounts for the ocular manifestations associated with maxillofacial arteriovenous malformation (AVM) outside the orbit.

Design: Retrospective noncomparative case series.

Participants: Seven patients with maxillofacial AVM who had been previously treated, unsuccessfully, with proximal ligation of the supplying external carotid artery branches were evaluated clinically and by superselective cerebral angiography.

Orbital avitene granuloma formation after enucleation for intraocular retinoblastoma.

Purpose: To report a case of orbital foreign body granuloma formation, mimicking tumor recurrence, secondary to the use of Avitene after enucleation for intraocular retinoblastoma.

Methods: Eight months after undergoing enucleation for retinoblastoma, a 21-month-old boy underwent a biopsy of an orbital mass.

Results: Histopathologic examination of the orbital biopsy specimen disclosed a proliferative granulomatous foreign body reaction surrounding multiple foci of a coarse fibrillar intercellular substance consistent with Avitene.

Localization of alkaline phosphatase on basolateral plasma membrane of normal and regenerating retinal pigment epithelium. A cytochemical study in rabbits.

Ultrastructural cytochemistry was used to analyze the polarized distribution of alkaline phosphatase (AP) on the plasma membranes of normal and regenerating retinal pigment epithelium (RPE) and the ciliary body epithelium in rabbits. The AP activity was concentrated on the basolateral plasma membrane in normal RPE. In regenerating RPE (after intravenous administration of sodium iodate to damage the RPE), there was a differential expression of AP activity according to the site on the regenerating epithelial sheet.

Expression of plasma membrane alkaline phosphatase in normal and regenerating choriocapillaris in the rabbit.

Ultrastructural histochemistry for plasma membrane nonspecific alkaline phosphatase was performed on the normal and regenerating choriocapillaris (CC) of rabbits. In normal animals the CC endothelium expressed little or no staining, whereas in regenerating CC the endothelium exhibited staining. The staining was most intense at the unfenestrated plasma membrane.