**Question:** False about SAPHO syndrome

A. SAPHO syndrome is a misnomer and actually stands for Synovitis, Acne, Pustulosis, Hyperostosis, and Osteomyelitis
B. SAPHO syndrome is primarily seen in children and adolescents
C. SAPHO syndrome is a consequence of underlying connective tissue disorders
D. The pathogenesis of SAPHO syndrome is poorly understood

**Correct Answer: A. SAPHO syndrome is a misnomer and actually stands for Synovitis, Acne, Pustulosis, Hyperostosis, and Osteomyelitis**

**Core Concept:** SAPHO syndrome is a group of clinical entities characterized by a combination of symptoms such as osteoarticular inflammation, skin lesions, and bone and soft tissue abnormalities. The acronym SAPHO (Synovitis, Acne, Pustulosis, Hyperostosis, and Osteomyelitis) was coined to describe this syndrome, which is not a misnomer.

**Why the Correct Answer is Right:** SAPHO syndrome primarily affects the axial skeleton, particularly the sternocostoclavicular and synostotic joints, and is often associated with skin lesions, osteitis, and osteoporosis. The acronym SAPHO helps in understanding the combination of symptoms and emphasizes the importance of considering this entity in the differential diagnosis of patients presenting with these symptoms.

**Why Each Wrong Option is Incorrect:**

**B. SAPHO syndrome is primarily seen in children and adolescents:**

The acronym SAPHO is misleadingly named, as it was coined to describe a syndrome that can affect individuals of all ages, not just children and adolescents. The syndrome can manifest in teenagers, adults, and the elderly, making this statement incorrect.

**C. SAPHO syndrome is a consequence of underlying connective tissue disorders:**

SAPHO syndrome is not directly linked to connective tissue disorders, such as rheumatoid arthritis or lupus. The syndrome has its own unique clinical presentation, and connecting it to pre-existing connective tissue disorders is incorrect.

**D. The pathogenesis of SAPHO syndrome is poorly understood:**

While the precise pathogenesis of SAPHO syndrome is not entirely clear, research has provided some insights into its etiology. The syndrome is believed to involve a combination of factors, including genetic, immunological, and environmental influences. The statement that the pathogenesis is poorly understood is not entirely true, as researchers have made significant progress in understanding the syndrome.

**Clinical Pearl:**

The SAPHO syndrome should be considered in the differential diagnosis of patients presenting with osteoarticular symptoms, skin lesions, and osteitis. The acronym helps in understanding the combination of symptoms and can aid in early diagnosis and appropriate management.