Cytopathological findings of proliferating pilomatricoma misdiagnosed as a malignant parotid gland tumor

Clinical and Pathological Features of Pilomatrixoma in Children: A Retrospective Study

INTRODUCTION

Pilomatrixoma is a benign skin neoplasm that is common in children and is often misdiagnosed. This study aimed to summarize the clinical and pathological features of pilomatrixoma in children.

METHODS

Data on demographic information, clinical and pathological features, diagnosis, and treatment of 171 patients with pilomatrixoma from Shenzhen Baoan Women's and Children's Hospital were collected and analyzed retrospectively.

RESULTS

The mean age of the patients was 5.7 (standard deviation [SD] = 3.9) years old, and there were 2 age peaks (≤1 year old, 5-11 years old) and 2 age valleys (2-4 years old, ≥12 years old). The mean disease course was 9.3 (SD = 14.1) months, 69.0%, 86.5%, and 95.3% of the patients' disease course in 6 months, 12 months, and 24 months, respectively. The mean tumor volume was 0.6 (SD = 1.0) cm3, and 81.3% of the patients' tumor volume ≤1.0 cm3. Tumors were distributed sequentially in the head and neck (77.2%), upper limbs (12.9%), trunk (7.6%), and lower limbs (2.3%). The correct rates of clinical and ultrasonic diagnosis were 50.9% and 38.6%, respectively. The two most common pathological features of pilomatrixoma were shadow cells (99.4%) and basaloid cells (94.7%). There were no significant differences in age, disease course, or tumor volume between the male and female patients (p > 0.05). The age and tumor volume of the patients in different body parts were significantly different (P1 = 3.10E-05 and P2 = 5.60E-05, respectively). The correlation between the disease course and tumor volume was positively significant (p ≤ 0.05). There was a significant correlation between the disease course and tumor volume in patients with tumors at upper limbs (p = 0.03).

CONCLUSION

The age of children with pilomatrixoma presented 2 peaks and 2 valleys. Most patients had disease courses in 24 months and with tumor volumes ≤1.0 cm3. The correct rates of clinical and ultrasonic diagnosis were relatively low. The head and neck were the most common distribution sites of pilomatrixoma, and shadow cells and basaloid cells were the most common pathological features. The tumor volume was positively correlated with disease course in patients with pilomatrixoma.

Cutaneous eccrine spiradenoma: Insights into cytomorphological features via fine needle aspiration biopsy and a comprehensive literature review

Eccrine spiradenoma (ES) is an uncommon and benign adnexal tumour originating from sweat glands. The cytological examination of ES poses a diagnostic challenge, as it can be mistaken for various benign and malignant basaloid skin neoplasms. The cytomorphologic features of ES are infrequently documented in existing literature. This study seeks to present a thorough exploration of the cytomorphologic traits associated with ES, accompanied by an analysis of ancillary testing that contribute to the accurate identification of this entity in cytological specimens.

Eccrine spiradenoma is infrequently encountered in fine needle aspiration (FNA) cytopathology, and the available literature on its cytomorphologic features is limited. The challenge arises from its similarity to other benign and malignant dermal basaloid neoplasms, emphasizing the critical role of clinicopathologic correlation and immunohistochemical staining in achieving a precise diagnosis.

Atypical Pediatric Presentation of Pilomatricoma

Pilomatricomas are uncommon, benign tumors of the hair follicle, which are often misdiagnosed upon initial inspection. Here we describe the case of a 4-year-old boy who presented with a persistent draining tumor on the left side of his neck for approximately two years. The tumor was originally misdiagnosed as scrofuloderma but, eventually, our patient's pilomatricoma was identified with biopsy and successfully treated with elliptical excision. We discuss the importance of considering pilomatricoma in the differential diagnosis.

Proliferating pilomatricoma in a 9-year-old girl

Proliferating pilomatricoma is a rare, benign tumor of hair matrix origin that rarely occurs in children. We report the case of a 9-year-old girl with a rapidly growing, proliferating pilomatricoma located on the glabella. The lesion was embolized and surgically excised, with histopathological examination of the tissue confirming the diagnosis of proliferating pilomatricoma.