Objective: Cervical sarcomas are exceedingly rare neoplasms associated with a poor prognosis.

Intraspinal PNETs are rare neoplasms that are usually metastatic in origin.

Extracranial schwannomas in the head and neck region are rare neoplasms.

Childhood brain tumors (CBT) include a diversity of rare neoplasms of largely unknown etiology.

Background: Giant cell tumors are rare neoplasms, representing less than 5% of all bone tumors.

Conclusions: Cervical sarcomas are rare neoplasms.

Renal schwannomas are extraordinarily rare neoplasms; only six have been reported, the majority of which occurred in the renal pelvis.

Solid pseudopapillary tumors (SPT) of the pancreas are rare neoplasms of low malignant potential that mostly affect young women.

Choroid plexus tumors (CPT) are rare neoplasms accounting for 1-4% of all pediatric brain tumors.

This case report demonstrates the value of ancillary molecular studies to assist in the diagnosis of rare neoplasms, including those at sites of metastasis.

These differences in the survival of sex cord stromal tumors indicate the importance of large databases to evaluate the efficacy of treatment for rare neoplasms.

Since primary renal angiosarcomas are rare neoplasms, the diagnosis of sarcomatoid renal carcinoma should be considered in primary renal neoplasms which show this angiosarcomatoid pattern.