Biomedical subjects
Publications and source records attributed to J M Piffaretti.
The results of the surgical treatment of 114 malignant eyelid tumors, performed by one surgeon, are reported. The localization, histology and evolution of the tumors, and the significance of surgery in treatment of these lesions, are discussed.
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A major problem in reconstructive and plastic surgery of the face is the assessment of exact distances between certain points of reference across facial contours. Incorrect estimation of these variables produces unsatisfactory postoperative anatomical results. Therefore a method, which permits exact measurements using stereoscopic photography of models, was tested. On the models quantitative studies of the effects of surgical techniques were made. Facial asymmetry and various phases of facial animation can be assessed and documented, and the progress of expanding tumours can likewise be followed.
UNLABELLED: We discuss 10 consecutive cases which have had surgery after irradiation for tumors of the eyelids. CONCLUSIONS: Reasons for surgical treatment after irradiation: 1. Relaps within the irradiated area. Conditions of tissue prohibit additional irradiation. 2. No effect of irradiation. 3. Relaps in deeper layers or further growth, not noticed during irradiation. Additional irradiation ruinous for the eye. - Surgical problems after irradiation: 1. Inadequacy of usual techniques. 2. More extensive surgery then primary excision of tumor.
We tried to implanted permanent magnets in the eye lid to cure lagophthalmos. But severe complications occurred very often, mainly decubitus with expulsion of the magnet through the skin. We think that it is necessary to change the system to get better results with permanent magnets in the treatment of lagophthalmos.
In plastic operations of the fornix the most important part of the reconstruction in cases without defect of the subconjunctival planes is to cover the defect with a plastic to make impossible the formation of symblepharon and to permit the spontaneous epithelialisation of the fornix. We operated on seven patients with this method and we always obtained very good fornix.
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A quick embedding method for trabeculectomy specimens is desirable. It allows a comparison between the observations made during surgery and the histological material as long as the facts are remembered by the surgeon. Embedding by butoxy-ethanol-glycol-methacrylate proved to be adequate. It allows 1- to 2-mu thick sections. 39 trabeculectomy specimens were investigated in regard of topographical origin. In 26 of them, an exact localization was possible. Only 8 pieces contained Schlemm's canal or major parts of it. The others where cut more anteriorly and contained cornea and parts of the trabecular meshwork. The different topographical localization of the ectomized pieces did not influence the regulation of the intraocular tension in the early follow-up period. It is suggested that trabeculectomy does not give direct access to the aqueous to the cut ends of Schlemm's canal and to collector channels but rather by letting filter the aqueous externally along the scleral openings.
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