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Biomedical subjects

Hatem A Tawfik

Publications and source records attributed to Hatem A Tawfik.

7 recordsLinked to original sources
PubMed2005

Repair of exposed porous polyethylene implants utilizing flaps from the implant capsule.

PURPOSE: To determine the feasibility of the use of flaps from the capsule surrounding porous polyethylene implants in repairing large or recurrent implant exposures. DESIGN: Retrospective, noncomparative, interventional case series. PARTICIPANTS: Sixteen patients with exposed porous polyethylene implants. METHODS: Vertical and horizontal flaps were created from the implant capsule. These flaps were used to create a double layer of closure to seal the exposure. All patients had a minimum follow-up of at least 12 months. MAIN OUTCOME MEASURES: Repair of the exposure without recurrence during the follow-up interval, and assessment of complications. RESULTS: At the last follow-up visit, the socket was completely healed in all but 2 patients. In 1 of them, the implant was subsequently exchanged. Other complications included motility loss, conjunctival cyst, and granuloma formation. CONCLUSIONS: The use of the implant capsule to salvage exposed porous polyethylene implants is an effective technique; it is associated with some complications that can be minimized by careful case selection.

Adolescent↗
PubMed2005

Lack of response to systemic corticosteroids in patients with lymphangioma.

Lymphangioma is a benign nonencapsulated orbital tumor that is difficult to treat. Recently, systemic corticosteroids were advocated as a safe and effective alternative to surgical drainage of the cysts. We describe our experience with 3 cases in which proptosis progressed or did not improve despite the exclusive use of systemic steroids for 1 week, necessitating urgent surgical intervention. These three cases demonstrate that at least in some cases, steroids alone may be ineffective, and alternative interventions must be undertaken.

Administration, Oral↗
PubMed2004

Primary peg placement in evisceration with the spherical porous polyethylene orbital implant.

PURPOSE: To determine the efficacy of primary placement of a motility coupling post (MCP) in evisceration with the porous polyethylene (PP) implant. DESIGN: Retrospective noncomparative, interventional case series. PARTICIPANTS: Twenty patients undergoing evisceration. METHODS: A modified evisceration technique with porous polyethylene implants was performed, in which an MCP was placed primarily during the initial surgery. All patients were observed postoperatively for a minimum of 3 months. MAIN OUTCOME MEASURES: Socket motility, final position of the MCP in the orbit, patient satisfaction. RESULTS: At the last follow-up visit, an acceptable range of motility was attained in all patients. Nineteen patients had a centrally positioned MCP, and all patients were pleased with the cosmetic outcome and the range of motility achieved. Minor complications were noted, including a malpositioned MCP (n = 1) and poor motility in upgaze (n = 8). CONCLUSIONS: Primary peg placement at the time of evisceration with the PP implant is a promising technique with relatively minor complications so far, but properly constructed studies are required prospectively to compare motility with the MCP versus nonpegged implants.

Adolescent↗
PubMed2002

A histologic analysis and three-dimensional reconstruction of the muscle of Riolan.

PURPOSE: To describe the anatomic and histologic relations of the muscle of Riolan in the eyelid margin. METHODS: Serial microscopic sections of the eyelid were prepared, digitally scanned, and then reconstructed with computer software to create a 3-dimensional profile of this muscle group in two planes. RESULTS: The muscle of Riolan is a distinct subdivision of striated muscle that is separate from the pretarsal orbicularis muscle. In parasagittal eyelid sections, the muscle appears to be composed of two separate bundles, the pars ciliaris, located anterior to the tarsal plate, and a second smaller bundle, the pars subtarsalis, located posterior to the orifices of the meibomian glands. Coronal sections, however, demonstrate numerous muscle fibers that traverse the tarsus, connecting the two muscle groups that we describe for the first time as the pars fascicularis. CONCLUSIONS: The three muscle subdivisions are therefore physically joined together and appear to act as a single functional entity that should be collectively referred to as the muscle of Riolan.

Adult↗