Rich focus

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A Rich focus is a tuberculous granuloma occurring on the cortex of the brain that ruptures into the subarachnoid space, causing tuberculous meningitis.^[1]

It is named for Arnold Rice Rich who first described it.

References

Actinomycetaceae	Actinomyces israelii Actinomycosis Cutaneous actinomycosis Tropheryma whipplei Whipple's disease Arcanobacterium haemolyticum Arcanobacterium haemolyticum infection Actinomyces gerencseriae

Propionibacteriaceae	Propionibacterium acnes

M. tuberculosis/
M. bovis

M. leprae

R1:	M. kansasii M. marinum Aquarium granuloma

R2:	M. gordonae

R3:	M. avium complex/Mycobacterium avium/Mycobacterium intracellulare/MAP MAI infection M. ulcerans Buruli ulcer M. haemophilum

R4/RG:	M. fortuitum M. chelonae M. abscessus

bact (clas)

gr+f/gr+a (t)/gr-p (c)/gr-o

drug (J1p, w, n, m, vacc)

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