#1: Solid Tumor Rules (2018)
#3: Cervix Uteri
Source 1: 2018 Solid Tumor Rules
Notes: Other Sites, Updated 9/11/2018
Source 2: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3764746/
Solid Tumor Rules (2018)/Histology--Cervix Uteri: What is the histology code and what H Rule applies for a diagnosis of papillary squamotransitional cell carcinoma of the cervix? See Discussion.
It appears that the first Other Sites applicable rule is H16 (and Table 2) instructing the use of histology code 8323 (mixed cell adenocarcinoma). However, this really is not an adenocarcinoma tumor but is a mixed squamous and transitional cell carcinoma. The 2018 ICD-O-3 Histology Update Table provides a new term for a
squamotransitional cell carcinoma (C53_) but does not indicate whether that new term would also include a papillary squamotransitional cell carcinoma of the cervix.
Code papillary squamotransitional cell carcinoma (PSCC) as 8120/3 using the 2018 Other Sites Solid Tumor Rules, Rule H11. PSCC is a distinctive subcategory of squamous cell carcinoma of the uterine cervix. WHO Classification of Tumors of Female Reproductive Organs say that squamotransitional cell tumors show papillary architecture with fibrovascular cores lines by multilayered atypical epithelium.