Mechanism of acquired retraction pocket cholesteatoma formation
Mechanism of acquired retraction pocket cholesteatoma formation
As a retraction pocket is progressively drawn in, it forms a large pouch with a narrow neck that traps desquamating cells. (A) Normal drum in cross-section. (B) Shallow focal retraction. (C) Deep retraction with collection of keratin debris. (D) Infected cholesteatoma with granulation at its mouth.