Which is not a feature of pilonidal sinus:
**Question:** Which is not a feature of pilonidal sinus:
A. Infection
B. Chronic inflammation
C. Scarring
D. Progressive enlargement
**Core Concept:** Pilonidal sinus (PNS) is a condition characterized by a fistula that develops in the natal cleft, leading to chronic inflammation and infection.
**Why the Correct Answer is Right:**
D. Progressive enlargement is not a feature of PNS because it typically remains stable or may even shrink due to scarring and fibrosis over time. The condition is primarily characterized by infection, chronic inflammation, and scarring.
**Why Each Wrong Option is Incorrect:**
A. Infection: PNS often presents with recurrent abscesses and draining sinuses, which is a result of infection.
B. Chronic inflammation: PNS is characterized by a chronic inflammatory response in the affected area.
C. Scarring: As the condition progresses, there is significant scarring and fibrosis in the affected area.
**Clinical Pearl / High-Yield Fact:**
Pilonidal sinus is often misdiagnosed as a simple ingrown hair follicle or sebaceous cyst due to its clinical presentation. However, the presence of recurrent abscesses, draining sinuses, and characteristic histopathological findings can help differentiate PNS from these other conditions.
**Correct Answer:** Progressive enlargement
**Answer Text:** Progressive enlargement is not a feature of pilonidal sinus (PNS). Unlike other conditions like ingrown hair follicle or sebaceous cyst, PNS typically remains stable or may even shrink due to scarring and fibrosis over time. PNS is characterized by recurrent abscess formation, draining sinuses, and histopathological findings in the affected area, which can help differentiate it from other conditions like ingrown hair follicle or sebaceous cyst.