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​Symptoms and Signs – Differential Diagnosis of Mononucleosis
• Acute retroviral syndrome of HIV, lymphoma
• Bacterial and viral causes of pharyngitis
• Heterophil-negative infectious mononucleosis caused by cytomegalovirus (CMV); although clinical presentation may be similar, CMV more frequently follows transfusion.
• Toxoplasmosis
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​Symptoms and Signs – Differential Diagnosis of Morphea
• Atrophoderma
• Eosinophilic fasciitis
• Granuloma annulare
• Hypertrophic scar
• Lichen sclerosus
• Necrobiosis lipoidica
• Nephrogenic fibrosing dermopathy
• Porphyria cutanea tarda
• Scleroderma
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​Symptoms and Signs – Differential Diagnosis of Morton’s Neuroma
• Alcoholic neuropathy
• Diabetic neuropathy
• Gouty arthritis
• Nutritional neuropathy
• Osteoarthritis
• Rheumatoid arthritis (RA)
• Toxic neuropathy
• Trauma (e.g., fracture)
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​Symptoms and Signs – Differential Diagnosis of Mucormycosis
• Infection of the site by other organisms (bacterial [including TB and leprosy], viral, fungal, or protozoan)
• Noninfectious tissue necrosis (e.g., neoplasia, vasculitis, degenerative) of the site
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​Symptoms and Signs – Differential Diagnosis of Menopause
• TB
• Pregnancy
• Polycystic ovary syndrome
• Pituitary tumors
• Ovarian neoplasm
• Ovarian abnormalities
• Hypothyroidism
• Hypothalamic dysfunction
• Asherman’s syndrome
• Adrenal abnormalities
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​Symptoms and Signs – Differential Diagnosis of Mesenteric Adenitis
• Viral syndrome
• Irritable bowel syndrome (IBS)
• Crohn’s disease
• Acute appendicitis (5% to 10% of patients admitted to hospitals with a diagnosis of appendicitis are discharged with a diagnosis of mesenteric adenitis)
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​Symptoms and Signs – Differential Diagnosis of Non Occlusive Mesenteric Ischemia 
• Septic shock
• Drug induced (cocaine, vasopressors, ergot alkaloid poisoning) 
• Cardiovascular disease resulting in low-flow states (congestive heart failure [CHF], cardiogenic shock, post cardiopulmonary bypass, dysrhythmias)
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