This is a clinical photography of a cutaneous sarcoidosis lesion on the trunk, evaluated with diascopy to elicit an apple-jelly appearance. The imaging modality is a straightforward skin examination with a diascopic test, capturing surface and subcutaneous texture of a trunk lesion. The anatomical location is the torso, with involvement of the dermal and subcutaneous layers beneath erythematous, nodular plaques. Visual features include firm, well-circumscribed nodules and plaques with brown to orange-brown coloration that become more conspicuous under pressure, producing the characteristic apple-jelly nodules. The distribution appears on the central trunk, without obvious mucosal involvement, and there is minimal epidermal change overlying the lesion. Pathophysiology involves granulomatous inflammation with epithelioid histiocytes and multinucleated giant cells within the dermis, consistent with sarcoid granulomas. Clinically, diascopy-positive apple-jelly nodules support a granulomatous process and help distinguish sarcoidosis from other differential diagnoses such as lupus vulgaris and granulomatous dermatitis. Diagnostic significance lies in correlating with systemic sarcoidosis workup, including chest imaging and serum ACE levels. Potential clinical use cases include dermatology educational resources, differential diagnosis practice, biopsy decision-making, and monitoring response to therapy. This image thus serves as a representative dermatologic sign and provides visual context for cutaneous sarcoidosis.

This diagnostic image is an axial high-resolution computerized tomography (HRCT) scan of the thorax, specifically focusing on the lung parenchyma at the level of the lower lobes. The scan demonstrates a Usual Interstitial Pneumonia (UIP)-like pattern in a patient with clinical sarcoidosis. Key visual features include extensive reticulations and traction bronchiectasis (abnormal bronchial widening) within areas of fibrotic change. Characteristic honeycombing is present, appearing as subpleural, clustered cystic airspaces with well-defined, thickened walls. These findings exhibit a distinct basal and peripheral (subpleural) predominance, involving both lungs. This pattern of architectural distortion is representative of advanced pulmonary fibrosis. The educational focus is on identifying atypical presentations of sarcoidosis that mimic UIP, illustrating the transition from granulomatous inflammation to chronic fibrotic disease. This resource is intended for medical students and radiology residents studying interstitial lung disease (ILD) classification and diagnostic imaging.

This diagnostic image is an axial chest CT scan using a lung window, demonstrating findings characteristic of Stage 2 sarcoidosis. The primary pathological features include bilateral hilar adenopathy, visualized as symmetric soft tissue masses at the lung roots that obscure normal vascular and bronchial margins. Additionally, there is evidence of diffuse parenchymatous infiltration throughout both lung fields. These infiltrates present as ill-defined nodular opacities with a perilymphatic distribution pattern, typical of granulomatous inflammation. The image serves as a clinical example of pulmonary sarcoidosis involvement, illustrating both lymphatic enlargement and parenchymal disease. It is suitable for medical education regarding thoracic imaging and interstitial lung diseases.

This diagnostic axial CT image of the thorax, presented in a lung window, demonstrates classic radiographic features of pulmonary sarcoidosis. Key findings include prominent, systemic bilateral hilar and mediastinal lymphadenopathy, characterized by enlarged, soft-tissue density nodes at the root of both lungs. The lung parenchyma exhibits a subtle but widespread reticulonodular infiltration pattern, most notably in the mid-to-lower lung zones, consisting of fine linear opacities and small nodular densities scattered throughout the interstitial space. These findings lack significant consolidation or pleural effusion. In the clinical context of Löfgren’s syndrome—an acute presentation of sarcoidosis—this imaging captures the characteristic triad involving lymph node enlargement and pulmonary parenchymal involvement. This case serves as an educational example for radiology and pulmonology students to recognize the distribution of sarcoid-related adenopathy and the characteristic 'ground-glass' like texture of interstitial lung disease.

This clinical photograph shows the frontal view of a patient with cutaneous sarcoidosis, specifically lupus pernio, following systemic treatment. The image focuses on the mid-face region, including the nose, cheeks, and upper lip. While there is evidence of post-inflammatory texture changes and some subtle residual thickening, there is a marked absence of the highly characteristic indurated, violaceous, or reddish-brown shiny nodules and plaques typically seen in active lupus pernio. The nasal bridge and alae appear relatively smooth and the previous bulbous distortion has largely resolved. The skin tone on the cheeks and perioral area is more uniform, though some mild follicular prominence and chronic scarring may persist. This image serves as an educational example of the therapeutic response of cutaneous sarcoidosis to Janus kinase (JAK) inhibitor therapy, illustrating the significant reduction in granulomatous infiltration and the restoration of normal facial contours.

Imaging modality: Clinical dermatologic photography of a localized cutaneous plaque on the left nasal ala. The lesion is an indurated, erythematous-to-violaceous plaque with a rough surface and subtle nodularity, coalescing into a conspicuous patch along the ala nasi. The appearance is classic for lupus pernio-like cutaneous sarcoidosis, though biopsy is often required for definitive confirmation. The image emphasizes surface texture with increased dermal density and faintly infiltrated margins against surrounding normal facial skin. Involvement is confined to the external nose region; no adjacent mucosal ulceration or necrosis is evident in this view. The lesion color ranges from reddish to purplish pink, reflecting granulomatous inflammation beneath the epidermis. Clinically, such plaques may precede systemic sarcoidosis or accompany pulmonary, ocular, or multiorgan involvement; thus, this photo is valuable for differential diagnosis and educational case discussion. When compared with other granulomatous dermatoses, this presentation helps distinguish sarcoid skin lesions from infectious etiologies or rosacea variants. Potential clinical applications include guiding biopsy planning, monitoring therapeutic response to corticosteroids or steroid-sparing agents, and prompting systemic evaluation for sarcoidosis. This image serves as a teaching example for dermatologists, radiologists, and medical trainees studying cutaneous markers of systemic granulomatous disease. Clinical relevance includes monitoring progression and response.