Double Primary Malignancies Involving Cutaneous Carcinoma

Area of Science:

• Oncology
• Dermatology
• Medical Imaging

Background:

• Multiple primary malignancies (MPMs) involve 2+ distinct tumors in one individual.
• MPM prevalence is rising due to early detection and better treatments.
• MPMs with cutaneous carcinoma are infrequently reported.

Purpose of the Study:

• To present two rare cases of synchronous MPMs involving cutaneous malignancies.
• To illustrate the diagnostic utility of positron emission tomography/computed tomography (PET/CT) in identifying occult primary tumors in patients with skin cancers.

Main Methods:

• Case report analysis of two patients with synchronous MPMs.
• Review of diagnostic procedures, including PET/CT imaging.
• Histopathological confirmation of distinct primary malignancies.

Main Results:

• Two distinct cases of synchronous MPMs were identified.
• Case 1: Basal cell carcinoma with a secondary thyroid carcinoma.
• Case 2: Primary cutaneous mucinous carcinoma with a secondary thymoma.
• PET/CT successfully detected occult primary tumors in both cases.

Conclusions:

• Synchronous MPMs involving cutaneous malignancies are uncommon but occur.
• PET/CT is a valuable tool for detecting unexpected, synchronous primary tumors in patients presenting with cutaneous malignancies.
• Early detection and comprehensive staging are crucial for managing MPMs.