Answer to the last #DiagnosticDilemma
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The answer to the last Diagnostic Dilemma (A 26-year-old previously healthy man with a 3-day history of fever, dry cough, and nonpruritic rash, crackles on the left side of the chest and a macular, targetoid rash on his hands and feet, including the palms and soles) is E) Mycoplasma pneumoniae-associated mucositis.

A radiograph of the chest showed infiltrates in the left lower lung field. Bacterial cultures of the blood and sputum and a PCR test for herpes simplex virus in a specimen from the oral lesions were negative. Testing for Mycoplasma pneumoniae by PCR of the nasopharyngeal aspirate and for serum IgM antibody was positive.

Mycoplasma is commonly associated with exanthems. In this case, the clinical presentation was consistent with Mycoplasma pneumoniae–induced erythema multiforme, also referred to as mycoplasma-induced rash and mucositis. Given the severity of the mucosal involvement, a nasogastric tube was placed for nutrition and for administration of medications. After approximately 2 weeks of treatment with doxycycline, the patient had complete resolution of his respiratory illness and mucositis.

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Source: NEJM
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