title: Clostridium septicum Pneumocephalus.
abstract: BACKGROUND
  Spontaneous pneumocephalus in the nontraumatic setting is distinctly unusual. Pneumocephalus from central nervous system infection with Clostridium septicum has been rarely reported, and more commonly reflects a later stage of abscess formation. We present an unusual case of invasive C. septicum infection without an associated diagnosed malignancy presenting with rapidly progressive CNS pathology and resultant early pneumocephalus.
  
  
  METHODS
  Medical records, radiologic imaging, and microbiological specimens of a case were reviewed.
  
  
  RESULTS
  A 66-year-old male presented with a history of two witnessed generalized tonic-clonic seizures on awakening. He was found unresponsive at the scene by paramedics and subsequently intubated. There was no reported antecedent symptomatology, such as headache, fever, chills, focal weakness, and speech or gait disturbances. Medical history was remarkable only for diet-controlled hypertension. Computed tomography (CT) head imaging revealed an abnormal right parietal hypodensity. The patient was evaluated per the acute stroke protocol but was not deemed a candidate for intervention or thrombolytic therapy given the uncertainty of his clinical presentation; intravenous antibiotics were administered for possible sepsis. Follow-up CT imaging of the head performed 8 h later revealed right parieto-temporal pneumocephalus with extensive cerebral edema and effacement of basilar cisterns. Neurosurgical intervention was not deemed appropriate given the catastrophic nature of his injury and the patient subsequently expired 14 h after presentation. Blood cultures grew gram-positive rods in three of four bottles identified as C. septicum.
  
  
  CONCLUSIONS
  Clostridium septicum is an uncommon and often fatal cause of nontraumatic pneumocephalus. This underscores the need for a high index of clinical suspicion in cases with unexplained pneumocephalus, as early diagnosis remains the key to survival. In survivors of C. septicum infection, subsequent colonoscopy should be considered to exclude undiagnosed or occult gastrointestinal malignancy.
authors.affiliation: Critical Care & Sleep Medicine, Mercy Clinic and Hospital, 621 S. New Ballas Rd, Tower B, Ste 4006, St. Louis, MO, 63141, USA.
authors.forename: Anup
authors.initials: A
authors.lastname: Katyal
authors.affiliation: Pulmonary, Critical Care & Sleep Medicine, Mercy Clinic and Hospital, 621 S. New Ballas Rd, Tower A, Ste 228, St. Louis, MO, 63141, USA. dayton.dmello@mercy.net.
authors.forename: Dayton
authors.initials: D
authors.lastname: Dmello
mesh_terms: D000368:Aged; D003015:Clostridium Infections / Q000150:complications*; D052557:Clostridium septicum / Q000472:pathogenicity*; D006801:Humans; D008297:Male; D011007:Pneumocephalus / Q000209:etiology*
keywords: Clostridium septicum; Intracranial CNS disease; Pneumocephalus