**Core Concept:**
Cardiomyopathy refers to a group of disorders characterized by dysfunction of the heart muscle, leading to impaired cardiac output and filling of the heart. Chronic heart failure (CHF) is a common complication of cardiomyopathy, resulting from long-standing myocardial dysfunction. Radiographic findings in CHF can include pulmonary congestion, pleural effusions, and pulmonary vascular congestion.

**Why the Correct Answer is Right:**
The correct answer is D, "Atypical pleural effusion," because an atypical pleural effusion does not represent a typical finding in CHF. Atypical pleural effusions can be seen in conditions like tuberculosis, amyloidosis, or malignancy, which are not related to CHF.

**Why Each Wrong Option is Incorrect:**
A. "Normal cardiac silhouette": This is incorrect as a normal cardiac silhouette is not expected in CHF, as the heart enlarges and becomes hypertrophied in response to increased workload.
B. "Hypokinetic left ventricle": While hypokinesia is a common finding in CHF, specifically "hypokinetic left ventricle" is not a radiographic finding. Radiographic findings are typically global or regional, not specific to a single chamber or wall motion abnormality.
C. "Right ventricular enlargement": While right ventricular enlargement can be seen in CHF, the question specifically asks for a "non-radiographic finding." Radiographic findings are typically related to cardiac dimensions and vascular congestion.

**Clinical Pearl:**
In CHF, common radiographic findings include cardiomegaly (enlargement of heart), pulmonary congestion (higher pulmonary vascular markings), and pleural effusions (fluid accumulation between the lungs and the chest wall). These findings help differentiate CHF from other cardiac diseases that may present with similar symptoms, such as pneumonia or pulmonary embolism.

**Correct Answer:** D. "Atypical pleural effusion"