What type of malignant neoplasm is characterized by a tumor in connective tissue?

Chondrosarcoma is a type of malignant neoplasm that arises from connective tissue, specifically cartilaginous tissue. This form of cancer originates in chondrocytes, the cells responsible for cartilage formation, and is classified as a sarcoma because sarcomas are tumors that develop from mesenchymal tissue, which includes connective tissues such as bone, cartilage, and fat.

In the context of this question, the other types of tumors listed do not fit the definition of tumors that arise from connective tissue. Neuromas occur in nerve tissues, melanomas originate from melanocytes (the pigment-producing cells of skin), and adenocarcinomas arise from glandular epithelial tissues. Therefore, chondrosarcoma is uniquely positioned as the correct answer because it specifically pertains to tumors developing from connective tissue, qualifying it as a malignant neoplasm in that category.