This clinical photograph consists of two panels showing the right lateral and anterolateral views of a patient's neck. The primary finding is a large, prominent, circumscribed mass approximately 6 cm in diameter located in the right cervical region. The overlying skin exhibits significant inflammatory changes, including intense erythema and a shiny, taut texture suggesting edema and underlying tension. There are areas of subtle desquamation and a small, darker, well-demarcated area that may represent a focal scab or localized skin necrosis. The mass appears fluctuant, which is characteristic of a cold abscess or severe lymphadenitis. Clinically, this presentation is highly suggestive of tuberculous lymphadenitis (scrofula) or a severe bacterial cervical lymphadenitis. The presence of a surgical mask on the patient and a blue-gloved hand in the frame indicates a clinical examination setting. This visual material is used to teach the physical signs of extrapulmonary tuberculosis and the differential diagnosis of unilateral cervical masses in adults.

Clinical photograph of the left lateral neck and supraclavicular region of a patient, demonstrating classic features of scrofuloderma (cutaneous tuberculosis). The image shows multiple matted, enlarged cervical lymph nodes that have progressed to involve the overlying skin. Key visible findings include irregular skin ulcerations with undermined borders, friable granulation tissue, and active purulent drainage of a yellowish-white consistency. Distinctive draining sinus tracts are visible, along with thick, dark-colored crusts and scabs adjacent to the open lesions. The surrounding skin exhibits inflammatory changes, including erythema and hyperpigmentation. This presentation illustrates the progression of tuberculous lymphadenitis (scrofula) where the infection extends from deeper lymphatic structures to the cutaneous surface, resulting in chronic ulceration and cold abscess formation.

This diagnostic image is a T1-weighted sagittal MRI of the thoracic spine demonstrating classic radiological features of tuberculous spondylitis (Pott disease). The image shows significant pathology concentrated at the T4, T5, and T6 levels, characterized by altered marrow signal intensity within the vertebral bodies. There is evidence of endplate destruction and narrowing of the T4-T5 intervertebral disc space, indicating discitis-osteomyelitis. A large, multiloculated prevertebral and paraspinal soft tissue mass is visible, representing a tuberculous 'cold abscess' in the posterior mediastinum. This collection appears to exert a mass effect on adjacent anterior structures, such as the esophagus. The spinal canal shows potential for impingement due to the localized inflammation and bony destruction. This image serves as a key educational example of extrapulmonary tuberculosis presenting as spinal infection with associated paraspinal abscess formation.

This composite diagnostic image consists of three sagittal MRI views (a, b, and c) of the spinal column demonstrating multisegmental tuberculous spondylitis (Pott disease). Panel (a) is a sagittal T2-weighted sequence showing the cervical spine with signal hyperintensity and irregularities at the craniovertebral junction and upper cervical levels, suggestive of inflammatory involvement and prevertebral edema. Panel (b) shows the thoracic spine with significant pathology, including destruction and collapse of mid-thoracic vertebral bodies (D7-D8 region) and a large, hyperintense anterior fluid collection (cold abscess) extending from D5 to D8. This collection causes mass effect and compression of the spinal cord. Panel (c) is a T1-weighted sagittal view of the cervical spine further detailing the loss of normal vertebral architecture and prevertebral soft tissue thickening. Collectively, these images illustrate characteristic findings of spinal tuberculosis: spondylodiscitis, vertebral destruction, and paraspinal abscess formation across non-contiguous spinal levels.

This diagnostic image is a posterior-anterior (PA) chest X-ray demonstrating miliary tuberculosis. The primary radiographic finding is a diffuse, bilateral, and uniform distribution of fine pulmonary nodules throughout both lung fields. These nodules are approximately 1–3 mm in diameter and are spread evenly from the apices to the lung bases, creating the characteristic 'miliary' (millet seed-like) pattern. The distribution involves all lobes without significant sparing, indicating hematogenous dissemination of Mycobacterium tuberculosis. The lung parenchyma shows a granular texture due to the density of these nodules. Cardiac silhouette and mediastinal contours appear within normal limits in this view, and no obvious pleural effusions are noted. This image serves as a classic educational example of miliary pulmonary involvement, emphasizing the importance of recognizing diffuse micronodular patterns in infectious disease diagnostics.

This composite of diagnostic images illustrates a case of disseminated miliary Mycobacterium tuberculosis (MTB) involving the pulmonary and lymphatic systems. The top-left panel is a frontal chest X-ray (CXR) demonstrating diffuse, symmetric interstitial opacities throughout both lung fields. The top-right panel shows high-resolution computed tomography (HRCT) of the lungs, providing a clearer visualization of a classic miliary pattern consisting of tiny (1-3 mm), randomly distributed, well-defined nodules with no predilection for specific lung zones. The bottom-right panel displays a grayscale ultrasound of the spleen, revealing splenomegaly and a heterogeneous parenchymal texture characterized by multiple small, hypoechoic nodules. These splenic findings represent MTB granulomas or microabscesses. Collectively, these imaging modalities depict the typical appearance of 'primary' miliary tuberculosis in an immunocompromised context, highlighting the hematogenous spread of the infection to both pulmonary and extrapulmonary organs.