**Question:** Not a characteristic feature of Lowe's syndrome

**Core Concept:** Lowe's syndrome is a rare autosomal recessive disorder characterized by ocular, renal, and skeletal abnormalities. The question is asking whether a specific feature is NOT a part of its clinical presentation.

**Why the Correct Answer is Right:**

Correct Answer: **D**. Pulmonary hypertension is not a characteristic feature of Lowe's syndrome.

Lowe's syndrome is characterized by the following features:

1. **Ocular:** This syndrome is associated with corneal opacities, progressive myopia, and cataracts. Pulmonary hypertension is not a part of its ocular manifestations.
2. **Renal:** Lowe's syndrome features renal dysfunction, including Fanconi's syndrome, leading to renal tubular acidosis and electrolyte imbalances. Pulmonary hypertension is not a part of its renal manifestations.
3. **Skeletal:** Lowe's syndrome is associated with hypotonia, muscle weakness, and delayed motor and cognitive development. Pulmonary hypertension is not a part of its skeletal manifestations.

**Why Each Wrong Option is Incorrect:**

A. Pulmonary hypertension is a feature of idiopathic pulmonary arterial hypertension (PAH) and is distinct from the features of Lowe's syndrome.
B. Although renal dysfunction is present in both Lowe's syndrome and pulmonary hypertension, they are separate entities and do not share common features.
C. Lowe's syndrome primarily affects the eyes, kidneys, and skeleton, whereas pulmonary hypertension is a cardiovascular disorder, unrelated to the manifestations of Lowe's syndrome.
D. Pulmonary hypertension is not a part of the clinical presentation of Lowe's syndrome, as explained above.

**Clinical Pearl:** Lowe's syndrome is a rare disorder with characteristic ocular, renal, and skeletal manifestations. Recognizing the distinct features of Lowe's syndrome helps differentiate it from other related conditions, such as pulmonary hypertension, which is a separate entity with different clinical manifestations.