# Metastasis of Castration-Resistant Prostate Adenocarcinoma to the Lacrimal Gland: A Case Report

## TL;DR

This case report describes a rare instance of prostate cancer spreading to the lacrimal gland, highlighting the importance of considering metastasis in advanced prostate cancer patients with new eye symptoms.

## Contribution

The report presents a rare case of prostate adenocarcinoma metastasis to the lacrimal gland and emphasizes the need for high suspicion in similar clinical scenarios.

## Key findings

- Prostate adenocarcinoma metastasized to the lacrimal gland in a 49-year-old patient.
- Despite advanced diagnostic imaging and treatment, the patient's condition led to a fatal outcome.
- The case underscores the importance of considering metastasis in orbital lesions of advanced prostate cancer patients.

## Abstract

Background and Clinical Significance: Metastases of prostate adenocarcinoma most commonly involve the skeletal system, while orbital metastases, including those in the lacrimal gland, are extremely rare. Despite significant advances in the sensitivity of available imaging methods, their diagnosis is often delayed due to nonspecific clinical presentation and rarity of occurrence. Although exceedingly uncommon, orbital metastases have also been reported in other solid tumors, including certain gynecologic malignancies. Case presentation: A 49-year-old patient treated at our center for prostate adenocarcinoma with a Gleason score of 9, regional lymphadenopathy and bone metastases presented to the outpatient clinic with ptosis of the left eyelid, which had developed 7 days prior to examination (13 months after diagnosis of PC). Radiological diagnostics, including CT of the endocranium, revealed enlargement of the left lacrimal gland. An exploratory anterior orbitotomy was performed with an incisional biopsy of the tumor change under retrobulbar anesthesia, and histopathological analysis confirmed a metastatic tumor of the lacrimal gland originating from prostate adenocarcinoma. Despite the application of all available therapeutic measures, a fatal outcome occurred 6 months after the onset of ophthalmic symptoms. Discussion: Orbital involvement in metastatic prostate cancer remains poorly characterized due to its extreme rarity and nonspecific clinical presentation. This case emphasizes the need for a high index of suspicion for metastatic disease in patients with known advanced prostate cancer presenting with new orbital or lacrimal gland lesions, as imaging findings alone may be insufficient to distinguish metastases from primary orbital tumors. Conclusions: Metastasis of prostate adenocarcinoma to the lacrimal gland is an extremely rare clinical manifestation. Timely diagnosis and adequate radiological assessment are crucial for patient management and survival. The aims of this case report areto present a rare metastatic manifestation of prostate adenocarcinoma with orbital/lacrimal metastasis of prostate adenocarcinoma origin, and to highlight metastatic prostate disease as a potential differential diagnosis in orbital lesions and the importance of imaging methods in their detection.