Since the 18th century, spontaneous remissions of cancer—altogether a very rare event—have been observed repeatedly in connection with febrile infectious diseases, especially those of bacterial origin. In 1866, Busch described complete remissions occurring under erysipelas covering the tumor. In 1882, Fehleisen induced tumor remission with the inoculation of streptococci-causing erysipelas. The French physician Dussosoy dressed an ulcerated breast carcinoma with charpie soaked with gangrenous discharge and inoculated gangrenous matter; the tumor was said to have disappeared. In the 1950s, Huth described 24 remissions of leukemia after bacterial infections. Of a total of 224 spontaneous remissions of cancer reviewed by Stephenson, 62 had occurred under infection or persistent fever 

After Coley's death in 1936, MBV treatment was continued but clinical interest diminished in favor of radiotherapy and chemotherapy, which promised a breakthrough in cancer treatment comparable to antibacterial treatment. In 1961, the thalidomide tragedy occurred and gave rise in the United States to the Kefauver Harris Amendment, which applied strict requirements to preclinical and clinical investigations of new treatments. Although it had been used for 70 years, MBV was at that time classified as a new treatment, necessitating expensive investigations for drug licensing. As MBV is a natural substance and was therefore not patentable, the investment of millions of dollars for testing was unattractive for any drug company. As for academic institutions, other topics were more appealing than an old bacterial treatment dealing essentially with “dirt.”

Interestingly, in contrast to acute inflammation, chronic inflammation increases cancer risk and can affect every aspect of tumor development. Many chronic viral, bacterial, and parasitic infections are a risk factor for developing cancer: Helicobacter pylori in mucosa-associated lymphoid tissue lymphomas, Epstein-Barr virus in lymphoma or nasopharyngeal cancer, hepatitis B and C virus in liver cancer, herpes virus type 8 in Kaposi sarcoma, human papillomavirus in cervix or anogenital cancer, Schistosoma in bladder cancer, and others. About 15% to 20% of cancers worldwide are attributed to these infectious agents. Noninfectious chronic inflammatory diseases also are a major risk factor for cancer. Examples include inflammatory bowel disease and colon cancer, bronchitis and lung carcinoma, reflux esophagitis and esophageal cancer. Sustained inflammation seems to be the result of an individual's inability to eliminate infection and restore immune homeostasis. Immune and inflammatory cells as well as cytokines can have antitumor- and tumor-promoting functions, depending on the context.

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A 25 years old woman with a 12 month history of headaches and a 3 month history of "clumsiness walking" is being evaluated. An MRI scan shows that the cerebellar tonsils are in a low position and impinging into the vertebral canal. The patient asks how this condition developed. You explain it is most likely due to:

A. Congenital abnormality
B. Autoimmune disease
C. Genetic disorder
D. Traumatic injury
E. Brain tumor
F. Vascular disorder

The answer is A
This cerebellar description is likely to be Chiari malformation, which is a congenital underdevelopment of the posterior fossa. The underdeveloped fossa then causes the cerebellum to herniate through the foramen magnum. Chiari type I can be asymptomatic in childhood and manifests as headaches and ataxia in the adult. Chiari type II is more severe and symptomatic at birth and is associated with other CNS anomalies such as hydrocephalus and lumbosacral meningomyelocele (spina bifida).

The normal cerebellar tonsils may lie up to 3 mm below the foramen magnum in adults. In general, tonsils lying 5 mm or more below the foramen magnum on neuroimaging are considered to be consistent with a Chiari malformation, though there is no direct correlation between how low the tonsils are lying and clinical severity. With infants, however, tonsils as low as 6 mm below the foramen magnum can still be normal.

Syrinx (syringomyelia)

The term refers to two different syndromes, each representing a different stage of the disease. Wernicke encephalopathy (WE) is an acute syndrome requiring emergent treatment to prevent death and neurologic morbidity. Korsakoff syndrome (KS) refers to a chronic neurologic condition that usually occurs as a consequence of WE.

The classic triad of WE includes:
• Encephalopathy:
The encephalopathy is characterized by profound disorientation, indifference, and inattentiveness. If these are less severe and permit higher cognitive testing, impaired memory and learning are also evident. Some patients exhibit an agitated delirium related to concomitant ethanol withdrawal. An initial presentation with depressed level of consciousness is uncommon, although the course in untreated patients will progress through stupor and coma to death

• Oculomotor dysfunction:
Nystagmus, lateral rectus palsy, and conjugate gaze palsies reflect lesions of the oculomotor, abducens, and vestibular nuclei. Ocular abnormalities usually occur in combination rather than alone.

• Gait ataxia:
Ataxia primarily involves stance and gait and is likely due to a combination of polyneuropathy, cerebellar involvement, and vestibular dysfunction. When severe, walking is impossible. Less affected patients walk with a wide-based gait and slow, short-spaced steps. Gait abnormalities are appreciated only on tandem gait in some patients.

لازم تنتبه لشغلة مهمة هي أنّ الـ triad هذا ما موجود كله غير بأقل من ثلث المرضى. أغلب المرضى يجون بواحد أو ثنين من الأعراض
WE should be considered in the differential diagnosis of all patients presenting with acute delirium or acute ataxia.