Spontaneous regression is seen in –
**Core Concept**
Spontaneous regression refers to the phenomenon where a disease or condition recovers or improves without any specific treatment or intervention. This concept is particularly relevant in the context of certain cancers, autoimmune diseases, and other pathological conditions.
**Why the Correct Answer is Right**
Spontaneous regression is often observed in neuroblastoma, a type of cancer that affects the sympathetic nervous system. This phenomenon is thought to be due to the regression of immature cells in the tumor, which may be triggered by the body's natural immune response or other unknown mechanisms. The process of spontaneous regression involves the apoptosis (programmed cell death) of cancer cells, leading to a reduction in tumor size and a subsequent improvement in symptoms.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because spontaneous regression is not typically associated with conditions like hypertension, which is a chronic condition that requires ongoing management with medication and lifestyle modifications.
**Option B:** This option is incorrect because spontaneous regression is not a characteristic feature of chronic conditions like diabetes mellitus, which requires ongoing treatment and management to prevent complications.
**Option C:** This option is incorrect because spontaneous regression is not typically observed in conditions like rheumatoid arthritis, which is a chronic autoimmune disease that requires ongoing treatment with disease-modifying antirheumatic drugs (DMARDs).
**Clinical Pearl / High-Yield Fact**
One important clinical pearl to remember is that spontaneous regression can occur in certain types of cancers, particularly neuroblastoma, and should be considered in the differential diagnosis for children with abdominal masses or other symptoms suggestive of cancer.
**Correct Answer: C. Neuroblastoma**