Sebaceous carcinoma of the lung: histologic and immunohistochemical characterization of an unusual pulmonary neoplasm: report of a case and review of the literature.

Sebaceous neoplasms, including carcinomas, are tumors most often seen around the eye and eyelid. Cases of extraorbital sebaceous tumors associated with skin adnexa are less common. The parotid gland may also be a source for sebaceous neoplasms, and cases associated with minor salivary gland tissue have also been reported. Once beyond the oropharynx, individual cases of pharyngeal and laryngeal sebaceous tumors are reported. The case of a patient with primary sebaceous carcinoma of the bronchus is presented. Our case is that of an endobronchial mass that has histopathologic features of a sebaceous carcinoma, with predominance of areas with morphologically classic sebaceous differentiation, confirmed by oil red O stain for lipid, analyzed by immunohistochemistry and evaluated ultrastructurally. This unique tumor extends the spectrum of extraocular, extracutaneous neoplasms with sebaceous differentiation from existing single reports in the hypopharyx and larynx to now include bronchus.