L’lung abscess (suppurative lung parenchyma)


I- Overview :

it s’acts of’parenchymal necrosis caused the’microbial attack of the lung parenchyma by pyogenic germs that will result in the formation of pus. Depending on the location of the pus are identified 2 groups :

At the’socket : primitive lung abscess pus = At ​​level’a pre-existing cavity : secondary suppuration


L’lung abscess is an acute suppurative, collected in a cavity néoformée, cut into the previously healthy lung parenchyma and caused by non-tuberculous infection (not specific).


L’abscess evolves 3 stages


The onset is sudden

* Functional and general signs are marked by :
A fixed side point
A fever 38 – 39°c, chills, accelerated heartbeat, a general weakness with anorexia (TIME) ->Dry cough PFLA, annoying, painful.
Moderate dyspnoea.

* L’physical examination : discreet, according to’scope
submatités translating localized pulmonary condensation homes (alveolitis fibrin-leukocyte) The crackles, rarely breath tubal

* Radiology shows : A dense opacity, homogeneous, systemized evil and fuzzy boundaries (alveolar pneumonia)

B- STAGE nux :

Corresponds to rejection, in a violent effort to cough, d’a significant amount of pus. It can be solid or split in the day. Overlooking tearing sensation.

The signs or prodromal symptoms are :
Halène foul.
small hemoptysis.
Tearing of’syncopal appearance felt in the chest +++


Regroup 2 syndromes

1- The general suppurating syndrome : makes oscillating fever.

2- The pulmonary suppuration syndrome :
Made of heavy purulent sputum.
moist rales.
Cavity Blow.
condensation zone.

* physical signs :
Breath Cavity becomes clear
sounding moist rales condensed area

* Radio shows :
– air-fluid picture : typical
C’is a round image, thick limits, regular
A base : opacity fluid topped’a clarity aeric, limited by a horizontal line regardless of the patient's position

* dgc differential :
Hydatid cyst ruptured, floating mb (undulating line)
Primary bronchial squamous Kc (limit within anfractueuse)
– single or multiple fuzzy opacity, blurry, variable d’a snapshot to another, but fixed seat’where interest of’TDM

* TDM : Specifies the number, headquarters, Nature excavated or not lesions and the presence of Fluid levels.


L’bacteriological examination of pus : critical time, allows to’study the bacterial flora, determine the dominant germ and practice susceptibility testing. However, BK must be negative.

The broncho-fibroscopie : Locates suppuration, d’There practice samples and check the permeability of bronchial explored.


FNS : leukocytosis accelerated VS and fibrinemieî.

Blood Sugar : Diabetes surtt if staph

Blood cultures which will be repeated if possible every feverish peak.


A- Bacteriological forms: more harmful :

1- anaerobes to abscess : Occurs in alcoholics performing abscess distance- "putrid gangrenous forms

2- Abscesses in Klebsiella pneumoniae or Bacillus Fried lambert : germ necrosis gives hémoptoïques sputum realizing extensive necroses. Its evolution is severe and leaves important legacy-type multiple cavities → aspergillosis graft

3- Staphylococcus abscess :
In infants : it gives digestive signs type abdominal bloating.
A la Rx : multiple opacities that blow giving lights affecting the pleura -> pyopneumothorax.
Ins. Respiratory
visit’adult, it gives multiple abscesses + nodular infiltrating septicopyohémique especially in diabetics.

4- Abscess other germs : A pneumococcal, to Streptococcus, in Hemophilus influenzae and BGN.

5- parasitic abscess : especially amoebic. We must look for a history of living in area’endemic or a home amoebic suppurated.

B- The etiological forms :

* Broncho-pulmonary infections :
DDB + BC - "chronic
bacterial and viral pneumonia - "acute

* Suppuration Neighborhood :
empyema, suppurative mediastinitis (Kc of’esophagus), suppuration under phrenic (liver abscess, peritonitis)

* infectious focus distance :
ORL, dental, surgical intervention (appendicitis, cholecystitis)

* particular context : penetrating wound of the peritoneum (trauma), accident swallowing due to a coma or anesthesia


* It is generally favorable :
Fall and resolution of fever and coughing after 8 days
radiological signs that normalize to about the 3th week (she s’improves 10-15J).

* adverse developments : residual cavity which is the seat of’chronic abscess. It is a provider of DDB.

Complications locales :
clear or empyema.
Aspergillome intra cavitaire
tubercular superinfection

General complications :
infectious arthritis cachexia →
Remote abscess notably’brain abscess.
Septicemia secondary amyloidosis


A- Medical treatment : Depends on the isolated germ and ground

1- appropriate antibiotic therapy : give by susceptibility testing method or proportion (antibiogramme), synergistic

The duration of treatment is 4-6 week, the most of 8 weeks.

2- The door’Entrance : ORL, dental

3- Terrain : eg balance diabetes

4- Physiotherapy : depends on’etiology

B- surgical treatment : It is rarely mentioned. when’he s’East, must be pre careful balance Indication : DDB localized poorly tolerated, chronic abscess, superinfected abscess sequelae (Kc), obstruction.

C- Surveillance : mandatory, must be continued so long’prevent recurrences that are possible Duration tjrs : > 6-8weeks =>Rx as possible, recurrence

Courses of Dr. Madache – Faculty of Constantine