RESUMO
Background: Ultrasound biomicroscopy (UBM) is a noninvasive imaging modality that enables in?vivo visualization of the structures of the anterior segment of the eye. Unlike routine ophthalmic diagnostic ultrasound which uses frequencies of 5–10 MHz, UBM utilizes ultrasound frequencies in the range of 50–100 MHz. The high?frequency probes in UBM allows for higher resolution and better visualization of subsurface ocular structures, even in the presence of anatomic or pathological obscuration. UBM has qualitative as well as quantitative applications in various disorders affecting the anterior segment of the eye. Despite its huge importance, many clinicians lack in knowledge about the technique and its clinical usefulness. The current educational video aims to address this gap in knowledge by highlighting the technique and various clinical indications of UBM. Purpose: The purpose of this video is to demonstrate the technique of UBM and showcase its quantitative and qualitative implications and importance through various clinical cases. Synopsis: UBM is an imaging technique that assesses the depth of tissue structures by measuring the time delay of the returning ultrasound signal. This modality is capable of measuring the size of various structures within the eye, such as the cornea, iris, ciliary body, sclera, and the depth of the anterior and posterior chamber. To perform a UBM, a transducer is inserted into a specially designed eye cup filled with distilled water, creating a water bath environment. Axial and longitudinal scans can be performed in a similar fashion as in routine diagnostic B?scan ultrasound. Quantitative indications for UBM depicted in this video include measurements of corneal thickness, depth of the anterior chamber, and the width of the angle. The video also showcases how UBM can aid in the diagnosis and management of various anterior segment disorders like angle?closure glaucoma, plateau iris configuration, secondary glaucoma, and anterior uveitis with complicated cataract. Qualitative indications for UBM highlighted in this video include its role in intermediate uveitis, ocular hypotony, ocular surface tumors, cystic lesions of iris, and identifying the location and type of intraocular foreign bodies in the anterior segment based on the type of artifact seen. Additionally, the video shows the applications of UBM in scleral and episcleral pathologies. Highlights: This video will educate clinicians about the technique of UBM and showcase a bouquet of UBM findings in various case scenarios, helping one to better understand the potential of this modality in clinical practice.
RESUMO
OBJECTIVE: To evaluate the clinical significance of AGUS including histologic results and diagnostic modalities according to menopausal status. METHODS: One hundred and four patients with AGUS were identified. Corresponding biopsies were available for 87 of these cases. The evaluation for histologic results and diagnostic modalities was made according to menopausal status. RESULTS: Among the 87 patients with AGUS, the number of premenopausal and menopausal patients were 46 (52.9%) and 41 (47.1%), respectively. Over all, 70 (80.5%) of 87 patients were found to have important histologic findings and of them, premenopausal and menopausal patients with invasive diseases were 19 (41.3%) and 31 (75.6%) respectively. There were significant differences in pathologic findings between premenopausal and menopausal patients indicating more invasive lesions in menopausal than premenopausal patients (p=0.002). For the evaluation of diagnostic modality, the second arm was significantly more needed for menopausal than premenopausal patients (p=0.018). CONCLUSION: AGUS on pap smear represents a cytologic diagnosis associated with high incidence of underlying preinvasive and invasive lesions, especially in postmenopausal patients. Thus aggressive work-up is recommended to rule out the potential pathologic conditions in endocervix, endometrium and rarely extrauterine lesions such as gastrointestinal, tubal, ovarian or breast in patients otherwise unexplained AGUS after careful first arm work-up.