Indian Journal of Pathology and Microbiology

: 2018  |  Volume : 61  |  Issue : 4  |  Page : 634--636

Primary pulmonary pleomorphic adenoma: A rare case report

Vandana Raphael, Bidyut B Gogoi, Jaya Mishra 
 Department of Pathology, North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences, Shillong, India

Correspondence Address:
Bidyut B Gogoi
Department of Pathology, North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences, Shillong

How to cite this article:
Raphael V, Gogoi BB, Mishra J. Primary pulmonary pleomorphic adenoma: A rare case report.Indian J Pathol Microbiol 2018;61:634-636

How to cite this URL:
Raphael V, Gogoi BB, Mishra J. Primary pulmonary pleomorphic adenoma: A rare case report. Indian J Pathol Microbiol [serial online] 2018 [cited 2022 Aug 16 ];61:634-636
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Primary pulmonary pleomorphic adenoma is a rare tumor with less than 15 cases reported in the literature till date, with no reference being found in Indian literature.[1] It has been reported in individuals ranging from 11 to 74 years, but most often affects those in their sixth and seventh decades of life with no gender predilection.[2] We present a case of a 32-year-old male with primary pulmonary pleomorphic adenoma.

The patient presented with complaints of recurrent fever associated with cough and expectoration for duration of 4 years. On X-ray examination, a well-defined opaque mass was detected in the lower lobe of right lung [Figure 1]a. Other laboratory parameters are within the normal limits. Subsequently, the patient underwent thoracotomy and right lower lobectomy.{Figure 1}

On gross examination of the resected specimen, a well-circumscribed mass in the lateral basal bronchopulmonary segment was noted, measuring 3 cm × 3 cm × 3 cm [Figure 1]b. The mass was intraparenchymal with no involvement of the endobronchial tree. On cut-section, the mass was solid, fleshy, gray white, with areas showing mucoid to glistening appearance. There was no area of necrosis or hemorrhage. No gross pathology was noted in the surrounding lung tissue.

On microscopic examination, the tumor was well-circumscribed, though there was no well-defined capsule. The tumor mass showed features consistent with pleomorphic adenoma. Surrounding lung parenchyma shows features of nonspecific inflammation with pneumonitis [Figure 2].{Figure 2}

Pleomorphic adenoma is the most common neoplasm of the salivary glands. It can occur in other sites, such as palate, tongue, nasopharynx, larynx, skin, breast, and soft tissue. Lung is an unusual site for pleomorphic adenoma. Even in those cases arising from the lung, it is more common inside the main bronchi rather than the lung parenchyma.[3],[4] The pulmonary tumors have a relative paucity or absence of duct-like structures in the epithelial component in comparison to their counterparts in the salivary glands. The epithelial elements in such cases are mostly arranged in strands, slender cords, and islands of tumor cells.[5]

The differential diagnosis to be considered here are hamartoma, pulmonary blastoma, and carcinosarcoma. In hamartoma, the chondroid elements are well developed and are sharply demarcated from the epithelial component, rather than being an integral part of the lesion. Pulmonary blastoma and carcinosarcoma will consist of malignant stroma and epithelium.[2],[5]

Small and well-circumscribed lesions are usually curable with lobectomy, while larger, poorly circumscribed lesions have tendency for recurrence and metastasis. High mitotic count (>5/10 hpf) may be associated with aggressive behavior, but in the absence of malignant cytology, angiolymphatic invasion, and necrosis such lesions should be diagnosed as benign pleomorphic adenoma rather than carcinoma ex-pleomorphic adenoma.[2] However, a long-term follow-up is recommended due to the possibility of malignant behavior.

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