Brodie’s abscess is -: (A) Chronic osteomyelitis, (B) Subacute osteomyelitis, (C) Acute osteomyelitis, (D) Septic arthritis
Answer is A. Chronic osteomyelitis is of 3 types: 
a) chronic osteomyelitis secondary to acute osteomyelitis 
b) Garre's osteomyelitis 
c) Brodie's abscess 

Brodies abscess is a special type of osteomyelitis in which body's defence mechanism have been able to contain infection so as to create chronic bone abscess containing pus or jelly-like granulation tissue surrounded by a zone of sclerosis. 
C/f: Common in 11-20 years Common sites upper tibia and the lower end of femur A deep boring pain is a predominant symptom. can become worse to-night. Examination reveals tenderness and thickening of bone.