2. • Causative organism : Mycobacterium tuberculosis
• Site : Juglodigastric lymph nodes ( most common)
posterior triangle group of lymph nodes
• Mode of infection –usually through tonsils , occasionally through
blood from lungs
3. Clinical features
• The patient has the usual general manifestations of tuberculosis: evening
pyrexia, cough (maybe from pulmonary tuberculosis),malaise
• Locally there will be regional lymphadenopathy
5. • Cold abscess is soft, smooth, nontender,
fluctuant, without involvement of the skin.
It is not warm. This is a clinical
manifestation of underlying caseation
• Left untreated, as a result of increased
pressure, cold abscess ruptures out of
the deep fascia to form collar stud
abscess which is adherent to the
overlying skin.
• Eventually collar stud abscess bursts
open, discharging sinus is formed. It can
be multiple, wide open mouth, often
undermined, nonmobile with bluish color
around the edge. It is usually not
indurated.
6. Investigations
• Aspiration of the pus in a cold abscess for cytology (for epithelioid
cells),staining (Ziehl-Neelsen—AFB) and culture
• If the mass is still in the early stages of adenitis, excision biopsy
should be done.
• Raised ESR and CRP
• Mantoux test may be useful; but not very reliable.
• Chest X-ray to look for pulmonary tuberculosis.
7. Treatment
Drugs
• Antitubercular drugs has to be started:
Rifampicin 450 mg OD , INH 300 mg OD ,Ethambutol 800 mg OD,
Pyrazinamide 1500 mg OD.
• Duration of treatment is usually 6-9 months.
Aspiration
• Zig-zag aspiration of cold abcess by wide bore needle in non dependent
area to prevent sinus formation
8. Incision and drainage
• If recurs, caseating material should be drained through a nondependent incision. After
draining the, wound is closed without placing a drain
Surgical removal
• indicated when
1. no local response to drugs or
2. When sinus persists.
• It is done by raising skin flaps and removing all caseating material and lymph nodes
Excision of the sinus track
when sinus develops.
