This diagnostic image is an axial slice from a Computed Tomography (CT) scan of the chest, displayed in a lung window. The primary finding is widespread cylindrical bronchiectasis, indicated by red arrows pointing to dilated, thick-walled bronchi. In cross-section, these dilated airways demonstrate the characteristic 'signet ring' sign, where the diameter of the bronchus is significantly larger than its accompanying pulmonary artery. The distribution of the bronchiectasis is bilateral and diffuse, involving multiple lobes. The background lung parenchyma exhibits heterogeneous areas of increased opacity and textural irregularity consistent with chronic inflammatory or post-infectious changes, though no acute pulmonary consolidation is visible. This imaging illustrates the typical morphological presentation of secondary bronchiectasis, often associated with chronic respiratory conditions or recurrent aspiration. The scan demonstrates the diagnostic utility of HRCT in evaluating airway dilation and bronchial wall thickening.

This diagnostic image is a thin-section high-resolution computed tomography (HRCT) axial reconstruction of the chest from a 15-year-old male with cystic fibrosis (CF). The image demonstrates severe bilateral bronchiectasis, characterized by significant bronchial dilatation. Multiple instances of the 'signet ring sign' are visible, where the internal diameter of the bronchus is larger than its accompanying pulmonary artery. There is a notable lack of normal bronchial tapering, with dilated airways extending into the lung periphery and visible within 1 cm of the pleural surface. The parenchyma shows mosaic attenuation; areas of decreased CT attenuation consistent with air trapping are observed in the central parenchyma, while regions marked with asterisks represent areas of relatively normal lung attenuation. The findings illustrate advanced chronic suppurative lung disease and small airway involvement common in pediatric CF patients with impaired pulmonary function (FEV1 45%).

This diagnostic axial CT scan of the chest focuses on the lower lung parenchyma and mediastinal structures at the level of a vertebral body. The image primarily demonstrates the 'signet ring sign,' a hallmark radiological finding of bronchiectasis. Specifically, highlighted regions show pathological bronchial dilation where the internal diameter of the air-filled bronchus is significantly larger than its accompanying pulmonary artery. In a healthy lung, the bronchus-to-artery (BA) ratio is typically 1:1 or less; here, the enlarged, thin-walled bronchus (the ring) adjacent to the smaller, opaque circular artery (the signet) indicates airway disease. The surrounding lung parenchyma appears largely hypodense and air-filled, though multiple discrete BA pairs across both lung fields exhibit similar morphological changes. This visual is used to teach diagnostic criteria for chronic obstructive or inflammatory lung conditions, such as bronchiectasis, by illustrating the lack of normal airway tapering and disproportionate bronchial enlargement.

This composite educational image illustrates diagnostic modalities for Chronic Thromboembolic Pulmonary Hypertension (CTEPH). Part A displays Right Heart Catheterization (RHC) hemodynamic waveforms and pressure readings. The pulmonary artery (PA) pressure (54/18/30 mmHg) and right ventricular (RV) pressure (51/6/10 mmHg) show significant systolic elevation, while the pulmonary capillary wedge pressure (PCWP 15/2/8 mmHg) remains within the normal range, confirming a precapillary pulmonary hypertension profile. Part B presents Digital Subtraction Angiography (DSA) of the bilateral pulmonary vasculature. A diagnostic catheter is seen traversing the right heart into the pulmonary arteries. The angiography reveals characteristic CTEPH findings, including irregular arterial branching, segmental stenoses, and 'pruned' distal vasculature, particularly evident on the left side. These visual features signify organized thrombi and microvasculopathy. This material is designed for advanced medical education in cardiology and pulmonology to demonstrate the integration of invasive hemodynamics and vascular imaging in the confirmatory diagnosis of Group 4 pulmonary hypertension.

A multi-parameter medical monitor display from a right heart catheterization (RHC) procedure. The primary visual focus is a pulmonary artery (PA) pressure waveform tracing, which demonstrates significantly elevated pressures. The PA waveform shows cyclical systolic peaks (labeled 'S') and diastolic troughs (labeled 'D'), with a numerical measurement of 68/24 (38) mmHg, indicating pulmonary hypertension. Positioned above the PA tracing are three electrocardiogram (ECG) leads (II, III, and aVL) showing a sinus rhythm at a heart rate (HR) of 93 beats per minute. Below the pressure tracing are continuous waveforms for pulse oximetry (SpO2) and respiration (Resp). Numerical data at the bottom of the screen confirm a heart rate of 93 bpm, a respiratory rate of 16 inspirations per minute, and an oxygen saturation level of 93%. This clinical image illustrates hemodynamic monitoring in a patient with systemic sclerosis-associated pulmonary arterial hypertension (SSc-PAH) following medical management.

A diagnostic hemodynamic tracing from a right heart catheterization (RHC) procedure. The image displays synchronized multi-parameter monitoring data, including a three-lead electrocardiogram (ECG) at the top showing leads II, III, and aVL with a heart rate of 93 bpm. The central section features a pressure-volume waveform representing pulmonary artery (PA) pressures. Systolic peaks (S) are visualized reaching approximately 68-70 mmHg, and diastolic troughs (D) are noted at approximately 24 mmHg, indicating significant pulmonary hypertension. A concurrent flatter waveform represents the pulmonary capillary wedge pressure (PCWP), with a mean value indicated around 38 mmHg. Bottom panels display digital telemetry data including a plethysmographic oxygen saturation (SpO2) of 93% and a respiratory rate of 16 inspirations per minute (ipm). This tracing is used in clinical cardiology and pulmonology to evaluate pulmonary vascular resistance and hemodynamic response in patients with systemic sclerosis-associated pulmonary arterial hypertension.

This clinical photograph displays a gross pathological specimen of an open pulmonary artery. The luminal surface of the vessel exhibits significant morphological alterations, characterized by multiple raised, yellowish intimal plaques consistent with atheroma. These features are a classic hallmark of chronic pulmonary hypertension, which in this clinical context is associated with Eisenmenger syndrome—a condition where long-standing left-to-right congenital heart shunts cause pulmonary vascular remodeling. The presence of atherosclerotic-like changes in the typically low-pressure pulmonary circuit indicates severe, prolonged elevation in pulmonary arterial pressure. The image serves as an educational tool for identifying macroscopic signs of vascular pathology in the setting of advanced congenital heart disease and pulmonary hypertensive vascular disease.

This diagnostic image consists of two panels showing a thoracic contrast-enhanced computed tomography (CT) scan in axial (left) and coronal (right) views. A red arrow in both views points to a prominent, low-attenuation space-occupying lesion located within the right pulmonary artery, extending toward the hilum. This finding is characteristic of a central pulmonary thrombus or embolism, appearing as a filling defect that obstructs the contrast-filled vessel lumen. Additional clinical findings include a large right-sided pleural effusion, visible as a crescentic fluid collection in the posterior-dependent portion of the right hemithorax on the axial view. The heart appears enlarged, consistent with cardiomegaly and potential right heart strain associated with chronic thromboembolic pulmonary hypertension (CTEPH). The image serves as an educational example of central pulmonary vascular pathology and its secondary effects on the thoracic cavity, such as pleural effusion and cardiac remodeling.