A rare case of paediatric non‑Hodgkin’s lymphoma.

Anaplastic large cell lymphoma (ALCL) is a rare disease accounting for 10%–15% of all non‑Hodgkin’s lymphomas in children. It is distinguished from other lymphomas by their anaplastic cytology and constant membrane expression of the CD30 antigen. We report a 9‑year‑old boy presented with a left calf swelling. Biopsy from swelling revealed as small cell variant of anaplastic lymphoma kinase‑positive ALCL. Staging with positron emission tomography–computed tomography showed lymph nodal and multiple extra‑nodal involvement. The extra‑nodal sites were lung, pancreas, bone, sphenoid sinus and muscles. He was started on ALCL‑99 protocol. [ABSTRACT FROM AUTHOR]