This diagnostic image consists of two side-by-side coronal Cone Beam Computed Tomography (CBCT) scans of the paranasal sinuses and anterior skull base. The primary focus is the radiological evaluation of the ethmoid roof anatomy. Key anatomical structures visible include the cribriform plate (CP), lateral lamella (LL) of the cribriform plate, ethmoid roof (ER), orbits, and maxillary sinuses. On the right-hand panel, a quantitative angular measurement of 42.7 degrees is displayed on the patient's left side. This measurement represents the angle between the lateral lamella and the horizontal plane of the cribriform plate, which is a critical landmark in the Gera classification system. An angle of 42.7 degrees corresponds to a Gera Type III classification, indicating an acute slope and high anatomical risk for iatrogenic skull base injury during functional endoscopic sinus surgery (FESS). The images illustrate the topographical relationship between the olfactory fossa depth and the surrounding orbital floor (OFL) landmarks used for preoperative surgical planning and risk stratification.

Educational infographic regarding tricuspid valve (TV) anatomy and tricuspid regurgitation (TR) classification. The top section illustrates the Hahn classification of TV anatomy via en-face echocardiographic views, categorizing valves by leaflet count: Type I (3 leaflets: A, P, S), Type II (2 leaflets), Type III (4 leaflets, further divided into IIIa, IIIb, and IIIc based on split anterior, posterior, or septal leaflets), and Type IV (5 leaflets). The middle section depicts TR aetiology, distinguishing between Primary (organic causes like endocarditis or rheumatic disease) and Secondary/Functional (Ventricular functional with RV dilatation vs. Atrial functional with RA dilatation and normal RV). The bottom section provides a five-class grading scheme for TR severity (Mild, Moderate, Severe, Massive, and Torrential) using color Doppler flow imaging. Each grade is defined by specific quantitative metrics: Vena Contracta (VC) ranging from <3 mm (Mild) to ≥21 mm (Torrential) and Effective Regurgitant Orifice Area (EROA) via the PISA method, ranging from <20 mm² (Mild) to ≥80 mm² (Torrential).

A composite of five clinical intraoral photographs illustrating a classification system for ankyloglossia (tongue-tie) based on lingual mobility and the morphology of the lingual frenulum. The degrees range from 1 to 5, demonstrating progressive variations in frenulum attachment and tongue restriction. Degree 1 shows a thick, restrictive frenulum with visible sublingual vasculature. Degree 2 depicts a thinner, cord-like frenulum with a slight apical cleft on the tongue tip and orthodontic appliances on the mandibular teeth. Degree 3 features a prominent, tight frenulum extending toward the tongue tip, significantly limiting elevation. Degree 4 displays a less fibrous but still restrictive frenulum with a flattened, broad tongue shape. Degree 5 represents a posterior or submucosal type where the tongue base appears heavily attached to the floor of the mouth, resulting in a short, rounded tongue appearance and severely limited protrusion. This educational material serves as a diagnostic guide for dental and oral surgery specialists to assess the severity of hypertrophic lingual frenula before considering surgical interventions like frenectomy.

A comparison chart illustrating the Malmgren classification of external inflammatory apical resorption (EIAR), a common complication in orthodontic practice. The educational graphic is divided into four stages (Degrees 1–4), each featuring a schematic anatomical diagram paired with a corresponding periapical radiographic image. Degree 1 shows an irregular outline of the root apex without significant loss of length. Degree 2 depicts minor resorption with root shortening up to 2 mm. Degree 3 shows moderate resorption where the root length is reduced by 2 mm up to one-third of the original length. Degree 4 represents severe resorption with loss exceeding one-third of the root length. The diagrams highlight the exposure of the root canal system as the apex blunts, while the radiographs demonstrate the transition from a pointed apical morphology to a flattened, shortened clinical appearance. This material serves as a diagnostic guide for assessing root health during orthodontic tooth movement.

A composite of six clinical photographs (labeled A through F) illustrating various benign anorectal conditions. A: Features prolapsed internal hemorrhoids presenting as reddish-purple, vascular tissue protruding through the anal orifice. B: Demonstrates an anal fissure characterized by erythema, inflammation, and visible mucosal tearing in the perianal region. C: Shows a thrombosed external hemorrhoid, appearing as a smooth, tense, bluish-purple perianal mass. D: Displays an anal fistula with visible scarring, skin induration, and a punctate external opening with purulent drainage. E: A clinical view of a full-thickness rectal prolapse, showing a concentric, erythematous protrusion of the rectal wall with visible circular mucosal folds, captured in a perioperative setting. F: Illustrates anal skin tags (acrochordons), which are hypertrophied, skin-colored, painless connective tissue folds at the anal verge. This collection serves as a visual diagnostic guide for medical education, emphasizing morphology, color, and anatomical location of common proctological pathologies.

This composite of clinical photographs illustrates varying degrees and presentations of hemorrhoidal disease and rectal prolapse. Panels A and B are external clinical photographs of the perianal region. Panel A demonstrates a moderate external prolapse with visible circumferential mucosal folds, tissue congestion, and associated hyperpigmentation of the surrounding perianal skin. Panel B shows a smaller, less pronounced prolapse with smoother, pinker mucosal tissue and less significant skin changes. Panels C and D provide an endoscopic or anoscope view of internal structures. Panel C highlights an internal asymmetrical prolapse characterized by prominent vascular patterns, focal erythema (red streaking), and areas of yellowish serous or mucosal discoloration. Panel D displays a well-detectable hemorrhoidal peduncle viewed through a surgical or diagnostic instrument, showing more uniform pink mucosal tissue and a distinct anatomical protrusion. These images serve as an educational comparison of hemorrhoidal classification, ranging from minor external prolapse to identifiable internal vascular pedicles, relevant for proctological diagnosis and treatment planning.

This set of clinical photographs illustrates various anatomical presentations of circumferential rectal or hemorrhoidal prolapse. Panels A and B display external views of a protruding, circumferential mass from the anal canal. The prolapsed tissue is erythematous, lobulated, and exhibits deep mucosal folds and creases, characteristic of advanced hemorrhoidal disease or full-thickness rectal prolapse. Panel C shows a similar circumferential prolapse with a darker, cyanotic, or violaceous hue, suggesting venous congestion or early strangulation. Panel D captures an intraoperative evaluation using an anal retractor (anoscopes), revealing the internal mucosal lining. This image demonstrates the bright red, vascularized tissue and the structural depth of the prolapse during surgical intervention, with visible sutures and minor bleeding at the surgical site. The collection serves to teach clinical recognition of prolapse severity and perioperative anatomical assessment in proctology and colorectal surgery.

This clinical photograph shows a proctoscopic examination of the perianal and rectal region. A transparent, rigid plastic proctoscope (indicated by a green arrow) is inserted into the anal canal to provide visualization. Centrally located within the lumen of the proctoscope is a prominent, protruding rectal mass. The mass is deep red in color, demonstrating a smooth, glistening, and edematous surface characteristic of rectal prolapse or a large internal hemorrhoid. The surrounding perianal skin appears thickened and congested. The procedure is being performed in a clinical setting, with gloved hands visible retracting the surrounding gluteal tissue to facilitate the insertion of the scope. This image illustrates the diagnostic visualization required before surgical interventions such as the Thiersch procedure for managing rectal protrusion in geriatric patients with high-risk comorbidities.