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Teratomas are neoplasms derived from two or more germ cell lines that may be either mature or immature. Teratomas occur in individuals aged 19–68 years old but some occur in younger individuals. The presenting symptoms are those of an intrapulmonary mass. Rarely, trichoptysis (literally, the expectoration of hair) has been described in some cases. Teratomas are slow-growing tumors, and slow growth...
Primary melanomas of the lung are rare malignant tumors of uncertain histogenesis believed by some to arise from melanocytic metaplasia of the bronchial respiratory epithelium or from primitive displaced melanocytic cells from the foregut, during the process of embryogenesis. Melanomas show no gender predilection and most occur between the ages of 29 and 80 years. Clinical symptoms are related to...
This is a rare neoplasm believed to arise from ectopic or aberrant thymic tissue in either lung or pleura, with histologic features resembling those of thymomas occurring in the thymus gland. The clinical manifestations are nonspecific including cough, chest pain, and fever. Tumors located near the pleura may be associated with effusions. Rare cases associated with myasthenia gravis have been reported...
Glomus tumors are distinctly uncommon in the lung and the trachea. Outside the lung and trachea, glomus tumors are seen in the extremities, particularly around the nail beds and internally in bone, stomach, colon, and small intestine and other sites. They are said to be derived from the glomus apparatus and thought to regulate blood flow, particularly in the extremities. Their true frequency is not...
Sclerosing hemangioma is an uncommon lung tumor believed to be derived from primitive respiratory epithelium. The tumor cells consist of two basic cell populations: surface cuboidal cells and deeper polygonal stromal cells. These tumors show a distinct female predilection and some series have been exclusively female. Among females, nonsmoking, middle-age Asian women appear to be at greater risk. The...
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