Posteroanterior (PA) view X-ray of both hands demonstrating chronic inflammatory arthritis, consistent with advanced rheumatoid arthritis. The bilateral images reveal significant involvement of the metacarpophalangeal (MCP) joints, characterized by marked joint space narrowing and subluxation where the proximal phalanges are partially displaced from the metacarpal heads. Classical ulnar deviation of the digits is present. The radiograph also shows cortical erosions and architectural distortion at the MCP and carpal joints, indicative of progressive erosive disease. The interphalangeal joints show milder changes compared to the MCP and wrist regions. These findings represent a late-stage manifestation of an inflammatory arthropathy, resulting in substantial joint deformity and malalignment. The image serves as a clinical teaching tool for recognizing radiographic hallmarks of chronic rheumatoid arthritis, including ulnar drift, subluxation, and symmetric joint space loss in the small joints of the hand.

This composite educational image illustrates the clinical and radiographic features of ulnar nerve palsy in the setting of rheumatoid arthritis. Image A is a clinical photograph showing the dorsal aspect of a left hand. It demonstrates a classic 'claw hand' deformity characterized by hyperextension at the metacarpophalangeal (MCP) joints and flexion at the proximal and distal interphalangeal (IP) joints, particularly affecting the ring and small fingers. Significant atrophy of the dorsal interossei muscles is visible as hollowed depressions between the metacarpal bones. Image B is a plain anteroposterior (AP) x-ray of the corresponding elbow joint. It reveals advanced arthritic changes consistent with rheumatoid arthritis, including severe joint space narrowing, subchondral bone destruction, and marked osteophyte formation. A notable valgus deformity is present, with prominent bony projections in the medial joint space. Together, these images illustrate the correlation between joint destruction (cubital tunnel pathology) and distal neurological deficits (ulnar neuropathy).

Clinical photograph showing bilateral hand and wrist deformities in a patient with chronic inflammatory arthritis. The left hand (dorsal view) exhibits classic boutonniere deformities of the index and middle fingers, characterized by flexion at the proximal interphalangeal (PIP) joints and hyperextension at the distal interphalangeal (DIP) joints. The left index finger also demonstrates significant radial deviation at the PIP joint level. The right hand (lateral-dorsal view) displays a boutonniere deformity of the ring finger and a prominent ulnar subluxation of the wrist joint, appearing as a volar and ulnar displacement of the carpus relative to the distal radius and ulna. These findings are representative of advanced joint destruction and ligamentous laxity often seen in systemic autoimmune conditions like seronegative arthritis or rheumatoid arthritis. The image serves as an educational reference for identifying characteristic musculoskeletal manifestations of systemic inflammatory diseases in the small joints of the hand.

This clinical dermatology photograph displays the classic malar or butterfly rash of systemic lupus erythematosus (SLE) on the central face. Modality is clinical photography using standard white-light illumination; frontal/anterior view; color-balanced, high-resolution capture to depict superficial erythema and patchy hyperemia across the malar eminences and nasal bridge. The rash forms a bilateral, 'butterfly' distribution that typically reaches the cheeks and bridge of the nose while sparing the nasolabial folds. The observed features include confluent to patchy, erythematous macules and plaques with uniform erythema, mild perivascular edema, and subtle textural change without overt crusting or scaling in this image. The clinical morphology is characteristic for acute cutaneous lupus erythematosus; photosensitivity may exacerbate lesions. This cutaneous finding is one of the diagnostic criteria for SLE when aligned with serologic abnormalities (ANA, anti-dsDNA) and systemic features; its presence increases diagnostic probability in a compatible patient. Differential considerations include rosacea, seborrheic dermatitis, contact dermatitis, and dermatomyositis rash; however, the malar distribution and nasal bridge involvement help distinguish lupus. Clinically, this image supports SLE workup and educational reference for recognizing lupus-associated facial rash in medical students, residents, and researchers; useful for pattern-recognition training and multimodal data repository indexing. This image emphasizes clinical-context interpretation and education.

A clinical photograph of a patient's face demonstrating dermatological and mucosal manifestations of Systemic Lupus Erythematosus (SLE). A classic malar rash (butterfly rash) is present, characterized by symmetric, erythematous-to-violaceous patchy lesions over the malar eminences and the bridge of the nose, notably sparing the nasolabial folds. Additionally, the perioral region exhibits significant erythema and mucosal involvement. The lips show evidence of hemorrhagic lesions, with visible blood crusting and a small fissure on the lower lip, suggestive of vasculitis or active systemic inflammation. These visual findings are key diagnostic indicators for SLE, particularly when associated with hematological abnormalities such as thrombocytopenia. The photograph provides a clear example of cutaneous lupus manifestations for clinical diagnosis and medical education.

This clinical photograph demonstrates a chronic gout-related tophus involving a finger. Modality: Clinical photography of a human hand. Anatomical location: finger, likely the proximal interphalangeal joint region of the index or middle finger. Appearance: a firm, nodular subcutaneous mass projecting from the dorsal aspect of the finger, about one to two centimeters in diameter, skin overlying the lesion is thin and not broken with mild erythema; the nodule may be slightly lobulated and adherent to underlying structures. Composition: tophus composed of monosodium urate crystals deposited in soft tissue with surrounding granulomatous inflammation; chalky white material can be palpated in some cases. Clinical significance: hallmark of chronic gout; correlates with hyperuricemia and recurrent acute flares; risk of joint destruction if untreated; differential includes rheumatoid nodules, epidermal inclusion cysts, or xanthomas. Diagnostic relevance: supports diagnosis of gout in patients with elevated uric acid; can guide management including urate-lowering therapy, anti-inflammatory treatment, and consideration of imaging such as ultrasound or crystal evaluation. Usage: educational illustration for dermatology, rheumatology, and medical training; useful for patient education on chronic gout and tophi formation, assessment of soft tissue nodules, and monitoring response to therapy. Clinical correlation with gout history strengthens diagnostic confidence; early recognition prevents joint damage and guides urate-targeted therapy outcomes.

Clinical photography of a left-hand digit showing a gouty tophus. This is a soft-tissue tophus arising from chronic gout with monosodium urate crystal deposition in subcutaneous tissue around the finger joints. The image depicts a single, large, rounded, nodular mass projecting from the dorsal aspect of a finger near the metacarpophalangeal region. The lesion is firm to palpation, with a smooth, pale to whitish surface and surrounding erythema; overlying skin shows mild atrophy and telangiectasia, consistent with chronic inflammatory change. The tophus contains chalky material grossly visible within the dermal and periarticular tissues and may extend toward the joint capsule, eroding adjacent cartilage or bone in long-standing disease. The appearance supports chronic tophaceous gout, though clinical correlation with serum uric acid and prior history of gout is essential. Differential considerations include rheumatoid nodules, xanthomas, and other soft-tissue masses, but the location, size, and chalky appearance strongly favor urate depositions. Diagnostic significance lies in confirming advanced disease with tophus formation; management implications include urate-lowering therapy optimization, anti-inflammatory prophylaxis during flares, and evaluation for additional tophi in other joints. The image is valuable for rheumatology education, dermatology/podiatry teaching, and radiologic-pathologic correlation with ultrasound or dual-energy CT to quantify urate burden.

This composite figure presents clinical imaging and pathology related to advanced ankylosing spondylitis (AS). (a-d) X-ray radiographs demonstrate classic musculoskeletal manifestations: bilateral sacroiliitis with joint space narrowing and articular sclerosis, a 'bamboo spine' appearance due to extensive syndesmophyte formation, and thoracic kyphosis. Osteonecrosis of the right femoral head is also visible. (e-f) T2-weighted sagittal MRIs of the thoracolumbar spine reveal destruction at the T9-10 level with disc denaturation, abnormal high signal intensity indicating hemorrhage or edema, and suspected interspinous ligament rupture. (g-h) H&E-stained histopathology (40x) shows necrotic bone fragments, granulation tissue, and fibrous connective tissue with inflammatory infiltration, ruling out malignancy or tuberculosis. (i) A schematic diagram illustrates the pathophysiology of intercostal neuralgia, depicting how a thoracic vertebral fracture can cause mechanical compression of the spinal cord and spinal nerve roots. This collection serves as an educational resource for recognizing the late-stage radiological features of AS and its potential neurological complications.

Clinical photography of both hands in dorsal view illustrating cutaneous manifestations of CREST syndrome, a limited form of systemic sclerosis. The image captures distal involvement with sclerodactyly characterized by sausage-like, firm fingers and tightly stretched skin. Telangiectatic vascular ectasia is evident on the dorsum of the hands and at digit tips, with occasional perioral telangiectasia suggested by subtle surface vessels near the lips. The skin appears pink-red and slightly glossy, reflecting chronic tightening and reduced pliability. In this presentation, Raynaud's phenomenon and calcinosis are common associated features though not directly visible in this photograph. Esophageal dysmotility, a hallmark of CREST, is clinically relevant but not demonstrable in an image; nonetheless, the clinical context remains important. The photographic field emphasizes distal-to-MCP joint distribution and the relative sparing of proximal extremities, which is typical for limited cutaneous disease. This image can be used for educational purposes to illustrate hallmark signs: scleroderma-like skin thickening, digit shortening, and superficial vascular changes without ulceration. Potential clinical applications include dermatologic assessment, rheumatology referral decision, patient education on disease phenotype, and documentation of progression or response to therapy aimed at vascular symptoms, skin tightening, and gastrointestinal involvement.

Two clinical photographs demonstrate dermatological manifestations of a systemic connective tissue disease, likely systemic sclerosis. The left panel shows the dorsal aspect of both hands, characterized by significant skin thickening and a taut, bound-down texture. The fingers exhibit tapering and fixed flexion contractures consistent with sclerodactyly. Subtle 'salt and pepper' pigmentary changes (hypopigmentation and hyperpigmentation) are visible on the dorsal surface. The right panel displays the dorsal aspect of the feet, which show similar skin tightening and thickening extending to the toes. Notable findings include xerosis (dryness) and onychodystrophy of the great toenails, suggestive of secondary fungal infection. These visual signs are classic hallmarks of the fibrotic phase of scleroderma, highlighting the loss of skin elasticity and characteristic digital changes used in the clinical diagnosis of CREST syndrome or systemic sclerosis.

This clinical photograph displays four panels of human donor knee joint specimens illustrating the progressive stages of cartilage degeneration using the modified Collins grading system (Grades 1–4). Grade 1 shows relatively smooth articular surfaces with minor fibrillations. Grade 2 demonstrates more pronounced fibrillation and visible fissuring of the cartilage surface. Grade 3 displays significant cartilage erosion covering up to 30% of the surface, exposing subchondral bone, accompanied by the formation of osteophytes. Grade 4 represents severe osteoarthritis with over 30% of the cartilage surface eroded, extensive exposure of subchondral bone, gross geometric bony remodeling, and prominent osteophyte formation. The specimens highlight key pathological features of osteoarthritis, including loss of cartilage integrity, subchondral bone exposure, and secondary bony changes in the knee joint. This image serves as a reference for orthopedic pathology and gross morphological assessment of joint disease severity.

This diagnostic image series presents a side-by-side comparison of T2 mapping MRI pseudocolor scans of the knee joint, illustrating the progression of osteoarthritis (OA) through the Recht grading system. The sequence (a–e) demonstrates the transition from normal articular cartilage to Grade IV OA. (a) Normal: Shows smooth, continuous cartilage with a uniform yellow-green color. (b) Grade I: Displays uneven cartilage thickness and the emergence of spot-like red colorations, indicating early matrix changes. (c) Grade II: Visualizes surface frizziness and mild joint space narrowing with irregular red gradations. (d) Grade III: Shows severe contour irregularity, visible cartilage defects, and highly mixed pseudocolor distribution. (e) Grade IV: Exhibits full-thickness cartilage defects, exfoliation, significant joint space narrowing, subchondral bone exposure, and extensive osteophyte formation. Clinically, these color shifts—from uniform green to heterogeneous red—reflect alterations in water content and collagen integrity, serving as a quantitative tool for assessing cartilage degeneration and osteoarthritis severity.

This clinical photograph displays the bilateral lower extremities of a patient, specifically from the mid-calf to the feet, showcasing the resolution phase of a dermatological condition. The skin presents with a predominantly purpuric and petechial rash. Key visible lesions include small, pinpoint reddish-purple petechiae and larger, palpable purpuric papules scattered along the anterior and lateral aspects of the legs. The morphology of the rash suggests small-vessel vasculitis, such as IgA vasculitis (formerly Henoch-Schönlein purpura), showing signs of fading following medical intervention. Some areas exhibit faint, dusky discoloration consistent with post-inflammatory changes or healing bruises. The distribution is notably symmetric and gravitates toward the distal limbs, a classic presentation for systemic leukocytoclastic vasculitis patterns. This image serves as a clinical example of cutaneous vasculitis progression and its visual response to corticosteroid therapy.

This clinical comparison photograph displays two panels (A and B) showing the progression of skin lesions on the lower leg of a patient diagnosed with IgA vasculitis (Henoch-Schönlein purpura). Panel A illustrates the acute presentation with diffuse, vibrant erythematous macules and papules that are extensively scattered and partially coalescent, forming larger inflammatory patches. Panel B shows the same anatomical region at a later stage, demonstrating a reduction in the density of the rash, though persistent palpable purpura and a localized area of intense confluent erythema remain visible. The image demonstrates the classic cutaneous manifestation of leukocytoclastic vasculitis, characterized by non-blanching red-to-purple lesions typically found in dependent areas. This visual aid is intended for medical education regarding the clinical recognition of systemic vasculitis and its dermatologic evolution during treatment.