Kikuchi-Fujimoto Disease: The Unexpected Diagnosis of a Cervical Adenopathy

Many cases of adenopathies, whose differential diagnosis includes a wide spectrum of pathologies (including some malignant conditions like lymphoproliferative diseases, e.g., lymphomas), resort to primary healthcare. Kikuchi-Fujimoto disease is a rare, benign, self-limiting entity characterized by adenopathies, mainly in the cervical region, which may be associated with constitutional symptoms. This specific pathology is very rare in primary care and is often overlooked. That is why it is essential to promote medical literacy and provide support in managing these cases, which we want to emphasize through this case presentation. This case report presents a 24-year-old female patient who sought a consultation at the Family Health Unit due to a painful swelling in the right cervical region that lasted two weeks. She denied a history of recent infections or constitutional symptoms. A painful and hard right submaxillary mass, measuring 2 cm in diameter, was identified upon palpation. An analytical study and ultrasound of the soft tissues of the cervical region were initially required. Analytically, there were no relevant changes; however, the ultrasound revealed "hypoechoic ganglion formations in the right laterocervical chains, from the retroauricular region to the lower region of the neck, the largest measuring 19x7mm". The patient was reassessed one month later, due to an increase in the number of adenopathies, and a new ultrasound was performed that revealed "supraclavicular adenopathy". After that, she was referred to Secondary Healthcare (Central Hospital), where a lymph node biopsy was performed, with histological results of Kikuchi-Fujimoto disease. The patient maintains a follow-up in a hemato-oncology consultation, with painless adenopathies that, according to her, get worse with anxiety symptoms. Currently, the patient is being treated symptomatically, with stabilization of adenopathies and anxious manifestations. These patients need long-term follow-up due to the possibility of disease recurrence or the development of autoimmune processes. Although it is a diagnosis of exclusion, this disease must always be considered, since it can be mistaken with other serious pathologies that require aggressive treatments. Regarding the relationship between anxiety disorder and the worsening of adenopathies, although no conclusive evidence was found in the literature, there are some studies that have established a connection between inflammation and the deterioration of certain depressive symptoms.