Purpose: To determine the intraocular pressure (IOP) lowering effect and complications of Ahmed valve implantation (AGV) in patients who underwent cyclophotocoagulation (CPC). Methods: Patients who underwent AGV after CPC in group 1, those who underwent CPC after AGV in group 2, and patients who underwent repeated CPC in group 3 were included in this retrospective observational study. Changes in IOP, number of glaucoma eye drops, and best corrected visual acuity (BCVA) were analyzed before and 1 week, 1 month, 3 months, 6 months, and 12 months after surgery, and postoperative complications were analyzed. Results: Eight patients in group 1, 10 patients in group 2, and seven patients in group 3 were included in the analysis. Preoperative IOP was 45.6 ± 15.5, 29.3 ± 5.6, and 43.4 ± 14.4 mmHg in the three groups, respectively, and the number of glaucoma eye drops was 3.8 ± 0.7, 3.9 ± 0.3, and 3.7 ± 1.0 in the three groups, respectively. At 12 months postoperatively, IOP decreased significantly in all three groups compared to preoperatively (all p < 0.05), and the number of glaucoma eye drops was also significantly reduced (all p < 0.05). Among patients with preoperative BCVA of 0.02 decimal or higher, postoperative BCVA decreased in two patients in group 2 and one in group 3 (p = 0.380). Hypotony occurred in one patient in group 1 and two patients in group 3 (p = 0.383), and among them, one patient in group 1 and one patient in group 3 progressed to the phthisis (p = 0.940). Conclusions In patients whose IOP cannot be controlled after CPC, AGV is expected to be used as a relatively safe and effective treatment method for lowering IOP.

Purpose: To present a case of a cystic solitary fibrous tumor (SFT), the first report of its kind in Korea, along with a review of the literature of SFTs affecting the orbit.Case summary: A 71-year-old male was referred to our practice due to diplopia for 2 years and 6 months. On ophthalmologic examination, 10-mm proptosis and inferolateral globe displacement were observed in the left eye, and extraocular movements were limited in all directions of gaze. A facial computed tomography scan and magnetic resonance imaging showed a lobulated, well-enhanced mass in the superonasal extraconal space. The tumor appeared to be heterogeneous; cystic tissue was suspected. An excisional biopsy was performed through anterior orbitotomy to remove the mass (dimensions, 43 × 30 × 28 mm3). Histological examination showed the tumor to be composed of spindle cells in collagenous tissue. Immunohistochemical staining was positive for CD34, CD99, and orbital SFT with cystic changes. Conclusions SFT arising in the orbit is extremely rare but should be considered in the differential diagnosis of progressing unilateral proptosis, keeping in mind that this condition may be accompanied by cystic changes.

Purpose: To present a case of a cystic solitary fibrous tumor (SFT), the first report of its kind in Korea, along with a review of the literature of SFTs affecting the orbit.Case summary: A 71-year-old male was referred to our practice due to diplopia for 2 years and 6 months. On ophthalmologic examination, 10-mm proptosis and inferolateral globe displacement were observed in the left eye, and extraocular movements were limited in all directions of gaze. A facial computed tomography scan and magnetic resonance imaging showed a lobulated, well-enhanced mass in the superonasal extraconal space. The tumor appeared to be heterogeneous; cystic tissue was suspected. An excisional biopsy was performed through anterior orbitotomy to remove the mass (dimensions, 43 × 30 × 28 mm3). Histological examination showed the tumor to be composed of spindle cells in collagenous tissue. Immunohistochemical staining was positive for CD34, CD99, and orbital SFT with cystic changes. Conclusions SFT arising in the orbit is extremely rare but should be considered in the differential diagnosis of progressing unilateral proptosis, keeping in mind that this condition may be accompanied by cystic changes.