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Biomedical subjects

D T Tse

Publications and source records attributed to D T Tse.

At least 55 records · Page 3Linked to original sources
PubMed1989

A two-layer closure of sino-orbital fistula.

A two-layer closure of sino-orbital fistulae using tension-free local flaps is described. For small fistulae, the opening is first closed with a mucosal turnover flap; this is combined on the orbital surface with a local rotational advancement flap of the orbital skin. For larger fistulae where a mucosal turnover flap cannot be fashioned, a two-stage, delayed, composite mucocutaneous rotational flap is used. The advantages of these techniques are: (1) a mucous membrane to provide nasal or sinus lining, insulating the raw ventral surface of the skin flap; (2) each flap has an independent blood supply; (3) local flaps are used, avoiding the use of a pedicle flap from forehead; (4) excellent cosmesis since tissues outside the orbital rim are not disturbed; and (5) does not require refitting of exenteration prosthesis since the integrity of the orbital rim is maintained. The authors have used these techniques in six patients with chronic sino-orbital fistulae of the exenterated socket. In one patient, a wound dehiscence occurred and a small fistula measuring 3 to 4 mm in diameter persisted. The fistulae of the remaining five patients were successfully closed.

Adult↗
PubMed1988

Elevated corneal epithelial lines in Acanthamoeba keratitis.

Elevated corneal epithelial lines are another clinical sign in Acanthamoeba corneal infection. In this report, one patient wore extended wear soft contact lenses, and another wore daily wear soft contact lenses. Both patients used distilled water and salt tablets in their lens care. Histopathologic examination of these lines revealed trophozoites and cysts. In one of the patients following penetrating keratoplasty, Acanthamoeba castellani and Acanthamoeba polyphaga were cultured by impression cytology of an epithelial line, as well as from the bulbar and tarsal conjunctiva. In the other patient who did not undergo penetrating keratoplasty, these lines appeared in the cornea one month after initial symptoms.

Acanthamoeba↗
PubMed1988

Results of optic nerve sheath fenestration for pseudotumor cerebri. The lateral orbitotomy approach.

Twenty-eight patients with pseudotumor cerebri underwent 40 optic nerve sheath fenestrations for relief of visual loss or to preserve vision. Twenty women and eight men underwent 16 unilateral fenestrations and 12 bilateral operations. Papilledema disappeared or was strikingly reduced in 24 of 28 patients. The other four patients had gliotic discs (two patients) or were followed up for only a short time. Visual acuity improved in 12 of 40 eyes and remained the same in 22 of 40 eyes. Seventeen eyes had preoperative visual acuity of 20/30 or better. In six eyes visual acuity decreased. Of eight eyes operated on that had visual acuity of 20/200 or worse, only three showed improvement. Visual fields improved in 21 of 40 eyes and remained the same in ten eyes. Five of the ten eyes that did not change had poor vision before surgery. Eight eyes in five patients continued to lose acuity postoperatively. Each of these eight eyes had a concomitant loss of visual field. An additional two eyes developed visual field loss with preserved visual acuity. The indications for surgery are early evidence of progressive loss of visual field or acuity in a patient with pseudotumor cerebri. Severe vision loss presents little opportunity for improvement but fenestration may be used in a last effort to preserve or restore vision.

Adult↗
PubMed1988

Optic nerve sheath fenestration in pseudotumor cerebri. A lateral orbitotomy approach.

In patients with pseudotumor cerebri accompanied by loss of vision, optic nerve sheath fenestration is an effective route to prompt recovery of vision. A lateral orbitotomy approach to decompression of the optic nerve is appropriate for the ophthalmologist with adequate orbital experience. A rectangular window of dura and arachnoid, measuring approximately 3 X 5 mm, is excised from the bulbous portion of the optic nerve. It is important that the arachnoid within the window is excised because an intact arachnoid is an effective barrier to cerebrospinal fluid egress. The use of operating microscope, microsurgical instrument, and microdissecting techniques are emphasized. Twenty-eight patients (40 eyes) with progressive visual loss were treated by surgical nerve sheath fenestration. A study of the indications, results, and complications of this procedure is presented in a companion article.

Arachnoid↗
PubMed1988

Technique for incisional biopsy of a lacrimal gland mass when the diagnosis of benign mixed tumor cannot be excluded clinically.

In most cases of a lacrimal gland mass, the management course can be defined clearly based on an accurate history supported by characteristic radiographic features. There are, however, certain cases that do not fit cleanly into management algorithms and, on occasion, it may be necessary to obtain an incisional biopsy into a lacrimal gland mass when the diagnosis of benign mixed tumor cannot be excluded conclusively. We report a technique for incisional lacrimal gland biopsy under these circumstances. To prevent tumor spillage in the event of benign mixed tumor, the incision site into the gland is covered with several drops of butyl-2-cyanoacrylate. The biopsy specimen is submitted for frozen section examination. If the frozen section reveals benign mixed tumor, the entire gland may be removed, with the cyanoacrylate bond protecting the lacrimal gland contents from contaminating the orbit. The technique and its indications are described in detail.

Aged↗
PubMed1987

Recurrent and residual sebaceous carcinoma after Mohs' excision of the primary lesion.

We reviewed the histories of three patients with sebaceous carcinoma (two of the eyelid and one of the caruncle) who had had their tumors excised by surgeons experienced in the Mohs' technique. In each patient the tumor was considered totally excised. In one patient, residual intraepithelial pagetoid sebaceous carcinoma of the eyelid was detected incidentally when a reparative flap was placed. In the other two patients, invasive sebaceous carcinoma recurred, necessitating orbital exenteration; one patient has regional lymph node metastases. Because of the difficulty in detecting pagetoid spread on frozen sections and the multicentric nature of sebaceous carcinoma, we advocate managing these tumors by wide local excision, checking margins with high-quality permanent sections.

Adenocarcinoma↗
PubMed1987

Herniated orbital fat.

Three patients with acquired orbital fat herniation are presented. Each was felt to have a dehiscence in Tenon's capsule, allowing fat to spontaneously herniate forward. Orbital fat herniation may be confused with other lesions, such as dermolipomas. The clinical features and differential diagnosis of orbital fat prolapse are discussed.

Adipose Tissue↗
PubMed1986

Tarsal rotational flap for upper eyelid reconstruction.

Reconstruction of full-thickness defects in the upper eyelid presents a special challenge to the oculoplastic surgeon. We present and discuss a new, surgically simple technique for posterior lamella reconstruction of the upper eyelid, which can also be used with other procedures. The surgical technique calls for a vertical strip of tarsus (tarsal flap) to be rotated horizontally and sutured to canthal tendon remnants or periosteum at the orbital rim. This procedure has produced satisfactory to excellent results in our test group, and presents the reconstructive surgeon with several advantages over other techniques.

Adenocarcinoma↗
PubMed1986

Urticating histiocytosis: a mast cell-rich variant of histiocytosis X.

Histiocytosis X and mastocytosis are proliferative processes that may have similar cutaneous manifestations. However, a positive Darier's sign (urtication on stroking of the lesion) is thought to reliably distinguish between these two diseases. We recently studied a 13-year-old girl with a 2-year history of extensive skin lesions and a positive Darier's sign. Routine histopathologic studies revealed a polymorphous cutaneous infiltrate composed of histiocytes, mast cells, eosinophils, and lymphoid cells. Electron microscopic studies demonstrated Langerhans granules in some of the histiocytes, and immunologic studies of frozen tissue showed that a significant subpopulation of the histiocytes marked as Langerhans cells. Giemsa staining of specimens from eight other cases of cutaneous histiocytosis X from our files revealed mast cells in all of the lesions, although none showed the abundance of mast cells present in the case with urtication. Our studies emphasize the often polymorphous nature of the cell population in cutaneous histiocytosis X and demonstrate that confusing clinical findings can result when the mast cell population in histiocytosis X produces urtication.

Adolescent↗
PubMed1986

The slip knot for dacryocystorhinostomy flap closure.

During dacryocrystorhinostomy (DCR) surgery, anterior and/or posterior flaps are created and anastomosed with absorbable sutures. A prominent nasal bridge and recessed lacrimal crest can often make tying of the suture within a small incision difficult. We have simplified this tying process with the use of a slip knot. The knot is tied external to the incision and then slid into the operative site until the flaps are apposed.

Humans↗
PubMed1986

Cyanoacrylate tissue adhesive in securing orbital implants.

Butyl-2-cyanoacrylate (Histoacryl blue) tissue adhesive was used to secure orbital floor implants in the correction of superior sulcus deformities and blow-out fracture repairs and in one case of autogenous orbital roof bone plate. We have found this tissue adhesive to be a valuable substitute for wiring of orbital implants and have not seen general or local toxicity to the material.

Adult↗
PubMed1985

The use of a periosteal strip for eyelid reconstruction.

Strips of periosteum from the zygoma were used to reconstruct very extensive lateral canthal and temporal eyelid defects in 11 patients. The strips were reflected nasally, sutured to residual tarsal stumps, and covered anteriorly with myocutaneous flaps. After a minimum follow up of one year, cosmesis was excellent in five patients, satisfactory in five, and poor in one. Minor complications related to this procedure included ectropion and low lateral contour (one patient each), blunting of the lateral canthal angle (three patients), eyelid notching and dehiscence (one patient each), and symblepharon formation (one patient). However, only one patient had a complication that was significant enough to require a second surgery. This technique allows for one-stage reconstruction, an open palpebral fissure, and the ability to reconstruct extensive loss of the temporal portion of two adjacent eyelids when sharing techniques are not possible.

Adenocarcinoma↗