Diagnosis: PPD reaction
Description: Immunohistochemistry revealing CD3 positive lymphocytes
Morphology: Indurated
Site: Arm,forearm
Sex: M
Age: 49
Type: Clinical & Histology
Submitted By: Nasuhi Engin Aydin
Differential Diagnosis
History: Dermal induration of tuberculin (Mantoux test) positivity 48 hours after PPD injection. Punch biopsy revealing a dominance of CD3 T lymphocytes see reference: Journal of Tropical Pediatrics, Vol. 50, No. 4, p.248-9 Immunohistochemistry of Tuberculin Skin Test.