Metastasizing malignant pleomorphic adenoma in a young man

Area of Science:

• Oncology
• Pathology
• Head and Neck Surgery

Background:

• Carcinoma of unknown primary site (CUP) presents a diagnostic challenge, often requiring extensive investigation.
• Malignant pleomorphic adenoma (MPA) is an exceedingly rare salivary gland neoplasm, with a predilection for older adults.
• Submandibular gland tumors are less common than parotid gland tumors, and malignant transformation is infrequent.

Observation:

• The case involved a young male patient presenting with widespread metastases.
• Initial investigations failed to identify a primary tumor site.
• Autopsy examination was crucial for determining the origin of the malignancy.

Findings:

• The autopsy revealed a previously undiagnosed malignant pleomorphic adenoma (MPA) of the submandibular gland as the primary source.
• The MPA had metastasized, leading to the patient's presentation with carcinoma of unknown primary site.
• The occurrence of MPA in a young individual is exceptionally uncommon.

Implications:

• This case underscores the importance of considering rare salivary gland tumors in the differential diagnosis of CUP, even in young patients.
• Autopsy remains a vital tool for elucidating the primary origin of malignancies in complex cases.
• Further research into the specific characteristics and behavior of MPA in younger populations may be warranted.