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Image Number 1993 (Atypical mycobacterial infection)

 
Morphology:
Plaque

Diagnosis: Atypical mycobacterial infection

Site: Arm,upper

Sex: M

Age: 58

Type:

Description: Firm, slightly tender, erythematous plaque

Submitted by: Ted Rosen

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Differential Diagnosis

History:

Patient traumatized posterior aspect of upper arm, near shoulder, while "scratching" the area by rubbing on the tiles of a swimming pool. The minor abrasion healed without incident, but three months later slowly developed an enlarging, firm, slightly tender bright red plaque (as shown). A biopsy showed granuloma. Tissue culture eventually grew M. marinum. The patient was successfully treated with oral minocycline along with adjunctive thermotherapy.



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