**Core Concept:** Peroxisomal disorders are a group of rare genetic disorders characterized by the deficiency of enzymes involved in various peroxisomal functions, particularly β-oxidation of very-long-chain fatty acids (VLCFA). Peroxisomes are small, membrane-bound organelles found in cells, which play a crucial role in various biological processes, including lipid and reactive oxygen species (ROS) detoxification.

**Why the Correct Answer is Right:** Zellweger syndrome is a peroxisomal disorder resulting from the deficiency of multiple enzymes involved in peroxisomal β-oxidation of VLCFA. This leads to impaired lipid and ROS detoxification, resulting in the characteristic clinical features of Zellweger syndrome.

**Why Each Wrong Option is Incorrect:**

A. Refsum disease is a peroxisomal disorder caused by the deficiency of an enzyme involved in the degradation of phytanic acid and pristanic acid, leading to accumulation of these compounds in the body and causing neurological symptoms. This is different from Zellweger syndrome.

B. X-linked adrenoleukodystrophy is a peroxisomal disorder caused by the deficiency of acyl-CoA dehydrogenase (ALD), which is involved in the β-oxidation of very-long-chain fatty acids. Unlike Zellweger syndrome, X-linked adrenoleukodystrophy primarily affects adrenal glands and white matter in the brain.

C. Tay-Sachs disease is a lysosomal disorder caused by the deficiency of hexosaminidase A enzyme, leading to the accumulation of ganglioside GM2 in the brain, causing neurodegeneration. This is different from Zellweger syndrome.

D. Acetone body myopathy is a peroxisomal disorder caused by the deficiency of enzymes involved in the β-oxidation of very-long-chain fatty acids. This disorder primarily affects muscle tissue, leading to muscle weakness and wasting. Unlike Zellweger syndrome, acetone body myopathy does not affect the central nervous system.

**Clinical Pearl:** The key to distinguishing between peroxisomal disorders is to assess the organ systems involved and the specific enzymatic deficiencies. Zellweger syndrome affects multiple organ systems, including the central nervous system, liver, spleen, kidneys, pancreas, and eyes, while the enzymatic deficiencies are involved in the β-oxidation of very-long-chain fatty acids.

**Why You Should Care:** Understanding the differential diagnosis of peroxisomal disorders is essential for accurate diagnosis and appropriate management of patients with these conditions, as the treatment and prognosis vary based on the specific enzyme deficiency and organ system involvement.