A rare dendritic cell tumor characterized by a neoplasm composed of spindle to ovoid cells with phenotypic features similar to those of interdigitating dendritic cells. Solitary lymph node involvement is common, although extranodal localization (in particular skin and soft tissue) has also been reported. Patients usually present with an asymptomatic mass, sometimes with systemic symptoms such as fatigue, fever, and night sweats. Generalized lymphadenopathy, splenomegaly, or hepatomegaly may be seen in rare cases. The clinical course is generally aggressive.

Li-Fraumeni syndrome is a rare disorder that greatly increases the risk of developing several types of cancer, particularly in children and young adults.\n\nThe cancers most often associated with Li-Fraumeni syndrome include breast cancer, a form of bone cancer called osteosarcoma, and cancers of soft tissues (such as muscle) called soft tissue sarcomas. Other cancers commonly seen in this syndrome include brain tumors, cancers of blood-forming tissues (leukemias), and a cancer called adrenocortical carcinoma that affects the outer layer of the adrenal glands (small hormone-producing glands on top of each kidney). Several other types of cancer also occur more frequently in people with Li-Fraumeni syndrome.\n\nA very similar condition called Li-Fraumeni-like syndrome shares many of the features of classic Li-Fraumeni syndrome. Both conditions significantly increase the chances of developing multiple cancers beginning in childhood; however, the pattern of specific cancers seen in affected family members is different.

Melanoma-pancreatic cancer syndrome is an inherited cancer predisposition syndrome in which mutation carriers have an increased risk of developing malignant melanoma and/or pancreatic cancer. Mutation carriers within families may develop either or both types of cancer (summary by Harinck et al., 2012). For background and phenotypic information on malignant melanoma and pancreatic cancer, see 155600 and 260350, respectively.