Cardiothoracic Imaging in Obesity Hypoventilation Syndrome: A Case Series

Cardiothoracic imaging findings in obesity hypoventilation syndrome, also known as Pickwickian syndrome, reveal distinct pulmonary and cardiovascular abnormalities, according to a case series published in Cureus on August 17, 2026. The medical condition, which links severe obesity with chronic alveolar hypoventilation, presents unique diagnostic challenges that clinicians evaluate through advanced chest radiography, computed tomography, and echocardiography.

Pulmonary and Vascular Manifestations on Imaging

According to the Cureus case series, cardiothoracic imaging in patients with obesity hypoventilation syndrome frequently demonstrates cardiomegaly, signs of pulmonary hypertension, and basilar atelectasis. The mechanical load of excess adipose tissue restricts chest wall expansion, altering normal lung volumes and gas exchange. Radiologists reviewing these scans observe elevated diaphragms and increased mediastinal fat deposition that can obscure subtle parenchymal lung disease.

The structural changes stem from chronic hypoxemia and hypercapnia characteristic of Pickwickian syndrome. Imaging modalities capture the downstream effects of long-standing nocturnal hypoventilation on the right side of the heart. Dilatation of the pulmonary trunk and right ventricle often appears alongside signs of systemic venous congestion, illustrating the intricate link between severe body habitus and cardiopulmonary decompensation.

Clinical Context and Diagnostic Evaluation

Obesity hypoventilation syndrome affects a subset of individuals with severe obesity, defined typically by a body mass index exceeding 30 kilograms per meter squared, who develop daytime hypercapnia that cannot be explained by other respiratory or neuromuscular disorders. Medical literature highlights that early recognition through chest imaging and arterial blood gas analysis prevents progressive right heart failure, or cor pulmonale.

Differential diagnoses often require ruling out obstructive sleep apnea, chronic obstructive pulmonary disease, and primary chest wall disorders. While polysomnography remains the gold standard for identifying sleep-disordered breathing patterns, cardiothoracic imaging provides essential baseline data regarding cardiac chamber sizes, pulmonary artery pressures, and structural lung integrity before initiating positive airway pressure therapy.