Focal malakoplakia in chronic periapical periodontitis

Malakoplakia is an unusual chronic inflammatory disease occurring predominantly in the bladder and only rarely affecting other organs. For the urinary tract, its aetiology has been ascribed to the presence of Escherichia coli, while the very few cases of cerebral malakoplakia which have been reported so far, have mostly occurred in infants in the clinical setting of neonatal herpes virus infection or otherwise in adults in areas of cerebral infarction. We here report a case of E. coli-associated malakoplakia of the brain. It occurred in a 53-year-old man who had undergone long-term corticosteroid therapy and had previously been operated on a cerebral E. coli-associated abscess. This case indicates that malakoplakia of the brain might also be a histiocytic reaction against bacterial antigens of the E. coli family.

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Cerebral malakoplakia associated with Escherichia coli infection

Rickert

August

Brandt³

et al. 2000

Acta Neuropathologica

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Hubble Space TelescopeObservations of the Host Galaxies of BL Lacertae Objects

Urry

Falomo

Scarpa

et al. 1999

ApJ

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Six BL Lac objects from the complete 1 Jy radio-selected sample of 34 objects were observed in Cycle 5 with the HST WFPC2 camera to an equivalent limiting flux of µ I ∼ 26 mag arcsec −2 . Here we report results for the second half of this sample, as well as new results for the first three objects, discussed previously by Falomo et al. (1997). In addition, we have analyzed in the same way HST images of three X-ray-selected BL Lacs observed by Jannuzi et al. (1997). The ensemble of 9 BL Lac objects spans the redshift range from z = 0.19 to ∼ 1. Host galaxies are clearly detected in seven cases, while the other two, at z ∼ 0.258 (redshift highly uncertain) and z = 0.997, are not resolved. The HST images constitute a homogeneous data set with unprecedented morphological information between a few tenths of an arcsecond and several arcseconds from the nucleus, allowing us in 6 of the 7 detected host galaxies to rule out definitively a pure disk light profile. The host galaxies are luminous ellipticals with an average absolute magnitude of M I ∼ −24.6 mag (with dispersion 0.7 mag), more than a magnitude brighter than L * and comparable to brightest cluster galaxies. The morphologies are generally smooth and have small ellipticities (ǫ ∼ < 0.2). Given such roundness, there is no obvious alignment with the more linear radio structures. In the six cases for which we have HST WFPC2 images in two filters, the derived color profiles show no strong spatial gradients and are as expected for K-corrected passively evolving elliptical galaxies. The host galaxies of the radio-selected and X-ray-selected BL Lacs for this very limited sample are comparable in both morphology and luminosity.

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Focal malakoplakia in chronic periapical periodontitis

Cited by 2 publications

References 18 publications

Cerebral malakoplakia associated with Escherichia coli infection

Cerebral malakoplakia associated with Escherichia coli infection

Hubble Space TelescopeObservations of the Host Galaxies of BL Lacertae Objects

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