Neuroblastoma of the Bone and Bone Marrow Without an Apparent Primary Site: Report of 4 Cases With Long-term Follow-up

Metastatic neuroblastoma presenting without a primary tumor: A case report

Neuroblastoma is the most common extracranial, intrabdominal, suprarenal solid tumor of childhood. It usually presents with painless abdominal mass with or without abdominal pain. We report an unusual subtle cervical lymph nodes enlargement associated with fever and joint pain. Neuroblastoma usually starts in the adrenal glands. What is unique in our case is that the presentation is without a primary tumor. We present a case of 4-year-old female Egyptian complaining of recurrent pattern of fever and generalized joint pain, with lower neck swelling for 1-month duration. Laboratory investigations revealed a normochromic normocytic anemia and increased inflammatory markers. Immunohistochemistry staining and immunophenotyping of the cervical lymph nodes and bone marrows confirmed the diagnosis of Neuroblastoma. This case report highlights the importance of recognizing the possibility of a metastatic neuroblastoma without primary tumor in children who presented solely of lymphadenopathy.