# Anti-TIF1γ-Dermatomyositis and Sjögren’s Syndrome As the Inaugural Presentation for Rectal Cancer

## TL;DR

A rare case of rectal cancer presented through dermatomyositis and Sjögren’s syndrome, highlighting the importance of cancer screening in such conditions.

## Contribution

This case report presents a rare presentation of rectal cancer associated with anti-TIF1γ dermatomyositis and secondary Sjögren’s syndrome.

## Key findings

- Dermatomyositis with anti-TIF1γ antibodies can present without typical muscle enzyme or electromyogram abnormalities.
- Sjögren’s syndrome was confirmed alongside dermatomyositis in a patient with rectal cancer.
- Early malignancy screening and multidisciplinary management led to successful cancer resection.

## Abstract

Dermatomyositis (DM) is an inflammatory myopathy often paraneoplastic in nature. Patients have characteristic cutaneous findings and possible muscle involvement. In the latter, muscle enzymes are elevated, and the electromyogram shows varied changes. Muscle or skin biopsy and myositis-specific antibodies confirm the diagnosis. Here, we report the case of an 86-year-old woman with cutaneous lesions, proximal weakness, and sicca symptoms. Muscle enzymes and electromyogram were normal. Antinuclear antibodies were elevated, and anti-TIF1γ and anti-Ro52 antibodies were positive. Muscle biopsy was compatible with the diagnosis of DM, and salivary gland biopsy confirmed Sjögren's syndrome. Malignancy investigation identified a rectal cancer, which was resected. This case illustrates a rare form of cancer presentation - anti-TIF1γ DM with normal muscle enzymes and electromyogram and concomitant secondary Sjögren's syndrome. Malignancy screening and multidisciplinary management were crucial to a successful approach.