A comparative clinical photograph set illustrating the Wagner Classification System for diabetic foot ulcers across four stages (Grade 1 to Grade 4). Grade 1 (Superficial Ulcer) shows a small, localized skin lesion on the plantar surface near the base of the toes with no deep tissue involvement. Grade 2 (Deep Ulcer) depicts a larger, deeper wound penetrating to the tendon or joint capsule without abscess or osteomyelitis. Grade 3 (Osteitis/Infection) demonstrates a deep ulcer associated with significant inflammation, purulent discharge, and clinical signs of underlying bone infection or deep tissue abscess. Grade 4 (Forefoot Gangrene) shows extensive necrosis and blackening of the tissue localized to the forefoot or toes, indicating severe vascular compromise and tissue death. This series serves as an educational tool for medical professionals to differentiate between stages of diabetic foot pathology, guiding clinical management and prognosis assessment.

A series of four clinical photographs (a-d) demonstrating the progression of diabetic foot ulcers categorized by the Wagner classification system. (a) Wagner Grade 1: A superficial ulcer on the left hallux (big toe) featuring erythema, periungual inflammation, and a thickened, discolored yellowish toenail, indicative of an ischemic etiology. (b) Wagner Grade 2: A deep ulcer on the fifth digit (pinky toe) showing more extensive tissue involvement and localized cyanosis. (c) Wagner Grade 3: A neuropathic perforating ulcer extending from the plantar surface to the dorsum of the foot, associated with deep infection, abscess, and clinical signs of osteomyelitis. (d) Wagner Grade 4: Advanced diabetic foot pathology exhibiting local gangrene of the second toe and a large, deep dorsal foot ulcer. The necrotic tissue is blackened, and the wound bed is exposed, revealing underlying anatomical structures such as tendons. This set illustrates the clinical manifestations of ischemic, neuropathic, and mixed-type diabetic foot disease for educational use in wound care and endocrinology.

This composite figure presents a clinical progression timeline of a complex diabetic foot ulcer (DFU) on the left foot, categorized under the Wagner classification system. (A) Initial presentation shows a large, 6x7 cm ulcer on the plantar forefoot with surrounding maceration and a lateral abscess. (B) Following initial debridement, the wound exhibits deep tissue involvement (Wagner Grade 3), with necrotic tissue extending to the tendons and musculature of the first through third toes, accompanied by a deep 2x2x0.7 cm abscess cavity. (C) Mid-treatment status demonstrates significant clinical improvement; the wound bed appears ruddy with healthy granulation tissue, reduced exudate, and diminishing necrotic debris. (D) Final follow-up at three months shows complete secondary intention healing with full epithelialization and stable scar tissue formation. (E) An accompanying summary table provides longitudinal data on treatment phases (including Fu's subcutaneous needling), ulcer/wound dimensions, Wagner grade transition (from Grade 3 to 0), and clinical markers such as cutaneous sensation, skin temperature, and presence of pus.

Clinical photograph of a right foot demonstrating a severe, extensive Wagner Grade III or IV diabetic foot ulcer. The wound spans the lateral and dorsal aspects of the foot, extending from the distal lower leg across the ankle joint to the midfoot region. The ulcer bed is characterized by beefy red granulation tissue and deep cavitation, with visible exposure of underlying musculoskeletal structures including the ankle joint. There are focal areas of yellow/white slough and fibrin, indicative of potential infection or chronic inflammatory processes. The wound margins are irregular but well-demarcated against the surrounding hyperpigmented, intact skin. This image serves as a clinical example of complex diabetic wound progression requiring advanced surgical intervention, such as debridement and microvascular flap reconstruction. Key educational concepts include diabetic foot classification, wound bed assessment, and the management of deep tissue infections with joint involvement.

This composite clinical photograph displays two dissection specimens of the upper (top) and lower (bottom) human limbs, illustrating the superficial lymphatic system through a microinjection technique. The specimens have had the skin and superficial adipose tissue removed to reveal the superficial lymph-collecting vessels, which have been injected with blue acrylic dye for visualization. In the upper limb, the blue-stained lymphatic vessels are seen originating from the hand and extending proximally toward the axillary region, where a white arrow identifies a sentinel lymph node. In the lower limb, vessels traverse from the foot and lower leg toward the groin, with a black arrow marking a sentinel node in the superficial inguinal region. The vessels appear as fine, independent, dark blue branching pathways within the subcutaneous layer, demonstrating a lack of extensive interconnections or network formation. These images serve as an anatomical reference for understanding normal lymphatic drainage, lymphosome territories, and the baseline pathways involved in conditions like lymphedema or cancer metastasis.

Diagnostic lymphoscintigraphic images of a 65-year-old male with secondary right lower limb lymphedema (LLLE) following inguinal node dissection for Merkel cell carcinoma. The panel includes three consecutive whole-body scans (WBS) and static pelvic images. Phase 1 (rest) shows normal tracer drainage to the left inguinal lymph node, while the right side displays delayed outflow. Phase 2 (active movement) demonstrates increased activity in the left inguinal region and limited distal drainage on the right. Phase 3 (post-walking) reveals significant pathological findings on the right, including dermal backflow at the foot and ankle, and a superficial collateral network extending proximally toward visible inguinal and iliac nodes. Detailed pelvic views (anterior and posterior) show collateral lymphatic drainage vessels (LVs), specifically median and oblique pathways. These include LVs crossing the midline and drainage toward the contralateral (left) inguinal lymph nodes. Arrows highlight specific collateral channels and areas of midline crossover, demonstrating physiological adaptations to lymphatic obstruction.

This composite diagnostic image features Phase 3 and Phase 4 99mTc-nanocolloid lymphoscintigraphy of a 13-year-old patient with primary lower limb lymphedema. The left panel shows an anterior whole-body scan (WBS) obtained after walking. It illustrates tracer progression from the feet. The right limb displays a horizontal arrow marking an inguinal nodal gap and decreased uptake in the common iliac and lumbo-aortic chains. The left limb shows lymphatic reflux toward the superficial dermal network of the thigh (oblique arrow) and an isolated lymph node in the left flank (vertical arrow). The right panel comprises a sequence of eight static images centered on the pelvis/abdomen following a supplemental intradermal injection in the left external buttock. This sequence demonstrates abnormal collateral drainage pathways: a lymphatic vessel (marked by vertical arrows) is seen crossing the anterior midline from the left inguinocrural region toward the right inguinal area, eventually reaching a contralateral inguinal lymph node. These findings characterize collateral lymphatic compensation in the setting of primary lymphatic insufficiency.

This composite figure displays diagnostic lymphoscintigraphic and SPECT-CT imaging of a 74-year-old female with secondary lower limb lymphedema following inguinal and iliac lymph node dissection. Panel A (Top): Anterior Whole-Body Scans (WBS) across three phases. Phase 1 (resting) shows normal drainage on the right and limited distal tracer progression on the left. Phase 2 (post-exercise) reveals increased right inguinal nodal activity and collateral vessels above the left ankle. Phase 3 (post-walking) demonstrates extensive dermal backflow on the left extending from the ankle to the groin, without visualizing distinct lymph nodes. Subsequent intradermal gluteal injections (right sub-panels) reveal alternate lymphatic pathways. Panel B (Bottom): SPECT-CT fusion images in transverse, coronal, and sagittal planes. These images localize radiocolloid uptake to deep collateral pathways, identifying intergluteal lymphatic vessels and intercalated nodes near the iliac crest and paravertebral regions. The imaging highlights the clinical significance of identifying deep lymphatic drainage when superficial inguinal nodes are absent, aiding in the surgical planning for lymph node-to-vein anastomosis or targeted physical therapy.

This medical illustration and surgical photograph composite details a murine model flap design for researching vascularized lymph node transfer (VLNT). The primary diagram shows a 10 mm wide bilateral pedicled abdominal flap (pink U-shaped skin paddle) that incorporates subcutaneous fat (yellow) and inguinal lymph nodes (green ovals). The vascular anatomy is depicted with abdominal arteries (red) and veins (blue). A purple inset provides a high-magnification view identifying a left groin lymph node (black arrow) and its associated feeding vessels. A green inset demonstrates the surgical technique for creating a unilateral congestion model through venous ligation; a black arrowhead indicates the specific ligation point on the vein, performed with a 10-0 nylon suture. This model is used to simulate clinical scenarios of impaired blood flow in transferred lymph nodes, allowing for the comparative study of ischemic, congestive, and control flap survival rates and pathological changes.

This diagnostic image is an intranodal lymphangiogram of the right groin region, demonstrating contrast-enhanced lymphatic anatomy and pathology. The image reveals multiple inguinal lymph nodes injected with contrast material (marked with stars), appearing as dense, opaque aggregates. Connecting these nodes are normal lymphatic vessels, visualized as thin, well-defined, linear branching structures (indicated by a straight arrow). A significant finding is the presence of lymphatic extravasation, characterized by an amorphous, cloud-like distribution of contrast material leaking from a medially located lymph node (indicated by a curved arrow). This extravasation represents a lymphatic leak or lymphorrhea, contrasting with the discrete margins of the healthy vessels. The imaging provides essential clinical context for identifying specific leakage sites in patients with post-surgical wound complications, such as those following vascular interventions, and serves as a roadmap for subsequent interventional procedures like N-butyl cyanoacrylate (NBCA) glue embolization.

This medical schematic illustrates the vascular anatomy of the right lower extremity, focusing on mechanisms for the recurrence of varicose veins in the groin region. The diagram depicts the outline of a leg with a primary vertical vessel, representing the great saphenous vein (GSV), extending from the foot to the thigh. In the inguinal (groin) area, specifically within Scarpa's triangle, the illustration highlights a complex vascular network in blue. Key components include a triangular-shaped structure representing the saphenofemoral junction or a venous confluence, and a brown, textured cluster representing a lymph node. Small blue vessels are shown interconnecting the lymph node with the main venous system, demonstrating lymphatic-venous communication. The diagram serves an educational purpose by visualizing how accessory lymph node vessels can serve as pathways for venous reflux, leading to recurrent varicosities after surgical or endovenous treatments like radiofrequency ablation (RFA). This clinical illustration is designed for vascular surgery and phlebology education.

This diagnostic fluoroscopic image is a groin lymphangiogram utilizing Lipiodol contrast. The radiograph displays the anatomical distribution of the inguinal lymphatic system in relation to the pelvic skeletal structures, including the iliac bone, acetabulum, and proximal femur. Opacified lymphatic vessels appear as thin, branching linear channels that ascend from the femoral region toward the pelvis. Multiple dense, lobulated clusters represent contrast-filled superficial and deep inguinal lymph nodes. The nodes vary in morphology and contrast density, with some showing intense opacification indicating successful uptake. The vessels track along the expected medial aspect of the thigh and course superiorly toward the external iliac chain. This imaging modality is typically used for investigating lymphatic leaks, such as chylothorax or chylous ascites, and for guiding interventions like thoracic duct embolization. The image demonstrates normal and variant branching patterns of the lymphatic network essential for procedural planning in interventional radiology.

This clinical photograph demonstrates an extraoral examination of the submandibular and cervical lymph nodes. The patient is positioned seated and reclined, wearing protective eyewear and a lavender dental bib. A clinician, donned in a lavender surgical gown and light-colored gloves, is shown performing manual palpation by placing their hands bilaterally along the patient's jawline and upper neck area. This procedure is a critical component of a comprehensive head and neck examination in dental and oral surgery contexts, used to detect lymphadenopathy or signs of inflammatory processes related to dental implants or oral infections. The image highlights the correct hand positioning for systematic palpation of the facial and neck soft tissues.

Clinical photographs demonstrating sentinel lymph node (SLN) detection techniques using a handheld gamma probe. Panel A shows an ex vivo examination of an excised lymph node specimen, which appears as a dark red, fleshy tissue on a sterile white gauze pad over a surgical drape. A gamma probe with a blue handle, encased in a sterile transparent sheath, is pointed at the specimen to measure radioactive uptake. Panel B displays the in vivo intraoperative application of the same technique. An open surgical field is maintained by a metallic self-retaining retractor, revealing deep reddish tissues and anatomical structures. The surgeon is utilizing the sterile gamma probe to scan the wound bed for any remaining radioactive 'hot spots' to identify additional sentinel lymph nodes. The image illustrates the workflow of radioguided surgery for oncological staging, focusing on the identification and removal of SLNs following the injection of a radioactive tracer.

This clinical photograph displays a lateral view of a pediatric patient's right neck, highlighting the submandibular region. A medical professional, wearing a white nitrile glove, is performing physical palpation of a visible anatomical abnormality. The key finding is a localized, rounded swelling or bulge measuring approximately 3 cm in the right submandibular area, consistent with lymphadenopathy. The overlying skin exhibits mild erythema compared to the adjacent cervical tissue but remains intact without ulceration or drainage. The image demonstrates the clinical examination technique for assessing cervical lymph nodes, specifically focused on size, mobility, and contour in the context of oral or systemic infection. The presence of a surgical face mask around the patient's neck and a dark shirt collar provide additional orientation.

Imaging modality: Intraoperative surgical photography of a sentinel lymph node biopsy for malignant melanoma. Technique: blue dye mapping using Lymphazurin blue (isosulfan blue) injected near the primary lesion to trace afferent lymphatics to the sentinel node, which is visually stained a blue-green hue. Anatomical context: axillary regional lymphatics draining the tumor bed are highlighted by dye transport, with the sentinel lymph node identified by conspicuous color uptake. Visual features: a single lymph node is enlarged and engorged, with surrounding adipose tissue and operating field in clear view; the node exhibits uniform blue coloration within the cortex and hilum, with surrounding soft tissues appearing erythematous from operative exposure. Notable findings: blue-stained sentinel node ready for targeted excision; no gross metastatic nodal disease is discernible on this view, though microscopic metastasis may be present. Clinical significance: sentinel lymph node biopsy is a standard staging procedure in melanoma, enabling nodal assessment while minimizing extensive lymphadenectomy. Differential considerations: accidental intradermal staining, dye leakage, or allergic reaction to isosulfan blue. Clinical correlation: histopathologic examination of the excised node is required to determine nodal metastasis status, guiding adjuvant therapy and prognosis. This image serves educational and surgical planning purposes for clinicians, trainees, and researchers studying lymphatic mapping in cutaneous melanoma.

This medical illustration depicts the surgical planning for a posterior approach to the knee, specifically for popliteal lymph node dissection. The image shows a posterior view of the left lower limb with a planned S-shaped (Lazy-S) incision line. The central transverse segment of the incision is positioned directly over the popliteal crease. The cranial (superior) portion of the incision curves laterally toward the thigh, while the caudal (inferior) portion curves medially toward the calf. This specific curvilinear geometry is designed to provide optimal exposure of the popliteal fossa contents—including the neurovascular bundle and lymph nodes—while preventing vertical scar contracture across the joint flexion line. The anatomical landmarks shown include the posterior thigh, the popliteal region, and the gastrocnemius muscle bulk of the calf. This type of incision is standard in surgical oncology and vascular surgery to minimize functional impairment of the knee joint postoperatively.

Axial MRI (T1-weighted image) of the popliteal region showing a metastatic mass originating from squamous cell carcinoma. The visual identifies a primary soft-tissue mass, labeled as a popliteal lymph node, measuring approximately 3 cm in size within the popliteal fossa. The mass is hyperintense relative to adjacent muscle and demonstrates a close anatomical relationship with the vascular bundle, specifically encasing the popliteal artery, which is labeled for reference. The image illustrates the complex anatomy of the posterior knee, including the femur and surrounding musculature. This diagnostic image is intended for medical education regarding oncological staging, regional lymphatic spread, and the surgical considerations of popliteal lymphadenectomy when tumors approximate major neurovascular structures.

A multi-panel diagnostic imaging series demonstrating sentinel lymph node (SLN) localization in a patient with malignant melanoma of the right foot. (a) Planar lymphoscintigraphy of the right popliteal region showing diffuse radiotracer uptake and faint lymphatic channels. (b) Sagittal SPECT/CT fusion image of the popliteal region, providing high-contrast localization of a single focal SLN within the posterior leg anatomy. (c) Corresponding sagittal low-dose CT alone, displaying the anatomical structures of the knee and lower limb without tracer data. (d) Axial SPECT/CT fusion image clearly identifying the SLN located posteriorly to the popliteal fossa. (e) Axial low-dose CT at the same level showing cross-sectional musculoskeletal anatomy of both knees. The comparison highlights the clinical advantage of hybrid SPECT/CT over planar lymphoscintigraphy for precise 3D anatomical mapping and surgical planning during sentinel node excision (SLNE) for cutaneous melanoma.