A case of dual malignancy: Presenting the necessity for extensive sampling for pathologic examination

Area of Science:

• Oncology
• Pathology
• Surgical Oncology

Background:

• Squamous-cell carcinoma (SCC) is a common oral malignancy.
• Papillary thyroid carcinoma (PTC) is the most frequent type of thyroid cancer.
• Metastasis of PTC to cervical lymph nodes is a known phenomenon, but its co-occurrence with oral SCC is rare.

Observation:

• A patient with early-stage oral SCC underwent surgical excision and histopathologic evaluation.
• A suspicious Level III lymph node, initially presumed to harbor SCC metastasis, was identified during surgery.
• Unexpectedly, the lymph node revealed features consistent with metastatic papillary thyroid carcinoma, not SCC.

Findings:

• The case presents a rare instance of dual malignancy: oral squamous-cell carcinoma and papillary thyroid carcinoma in an adult male.
• The diagnosis was incidental, stemming from meticulous surgical protocols and comprehensive histopathologic examination of all sampled tissues.
• This finding underscores the importance of thorough pathological assessment, even when a primary diagnosis seems straightforward.

Implications:

• Emphasizes the critical role of complete surgical excision and extensive tissue sampling in identifying unexpected or co-existing malignancies.
• Highlights the need for vigilance in histopathologic evaluation to avoid misdiagnosis, especially in cases with unusual presentations.
• Suggests that patients with head and neck malignancies may warrant consideration for other co-existing or metastatic cancers, necessitating a broad differential diagnosis.