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High grade squamous dysplasia of the tongue is reportable as of 2021 and later as 8077/2.

High grade squamous dysplasia (8077/2) is reportable for head and neck sites for cases diagnosed as of 01/01/2021. High grade glandular intraepithelial neoplasia / glandular intraepithelial neoplasia grade III (8148/2) and high grade squamous intraepithelial neoplasia / squamous intraepithelial neoplasia grade III (8077/2) are reportable for head and neck sites for cases diagnosed as of 01/01/2001. Refer to other standard setters’ criteria for reportability as appropriate.

High grade dysplasia of the esophagus is reportable. The example will be corrected in the next edition of the SEER manual.

High grade biliary intraepithelial neoplasia of the gallbladder is reportable. Assign code 8148/2. It is also known as biliary intraepithelial neoplasia grade 3, or BilIN-3.

HGAP is listed as a separate classification and is not a subtype of the diffuse gliomas. WHO Classification of Tumors of the Central Nervous System, 5th edition, has two categories dealing with non-pediatric astrocytic tumors:

Adult-type diffuse gliomas

Circumscribed astrocytic tumors

HGAP falls into the second category as a result of updates to the 4th edition WHO classification in 2016 with advances in the role of molecular diagnostics with the 5th edition. All astrocytic tumors were previously grouped together whereas not all diffuse gliomas (astrocytic or not) are grouped together on the basis of growth pattern and behaviors, and shared IDH1 and IDH2 genetic status. The new classification separates astrocytomas that have a more circumscribed growth pattern, lack IDH gene alterations, and sometimes have BRAF mutations (i.e., pilocytic astrocytoma). The impact of molecular advances has driven classification changes as described in the 5th edition.

Review of site/histologiy combinations for CNS neoplasms is currently being performed by Cancer PathCHART experts. It's possible they will recommend HGAP be moved to a subtype/variant of astrocytoma, NOS. 

Hematopoietic neoplasms that transform generally don't have 'chronic' or 'acute' as part of their preferred name. The 'chronic' and 'acute' designations are determined by the usual course of the neoplasm. Chronic neoplasms are generally slow growing while acute neoplasms grow fast and are more widespread. Not all Hematopoietic neoplasms transform. Each neoplasm that has the ability to transform has the transformations listed under the 'Transformations to' and/or 'Transformation from' sections in the Hematopoietic database.

For example, Diffuse large B-cell lymphoma (histology code 9680/3) has no histologies/neoplasms listed under 'transformations to.' This means that this neoplasm does not transform to any other neoplasm. There are multiple histologies/neoplasms listed under 'Transformations from' indicating the neoplasms listed under the Transformations from are the chronic neoplasms, and DLBCL is the acute neoplasm. If DLBCL (9680/3) occurs at the same time, within 21 days, or greater than 21 days of any of the histologies listed under 'Transformations From,' rules M8-M13 apply. If DLBCL (9680/3) occurred at the same time as a neoplasm not listed in the Transformations sections, the acute and chronic rules do not apply.

Hemangioma, NOS (9120/0) and cavernous hemangioma (9121/0) arising in the dura and parenchyma of the brain/CNS are reportable.

Venous angiomas (9122/0) are not reportable wherever they arise. The primary site for venous hemangioma arising in the brain is blood vessel (C490). The combination of 9122/0 and C490 is not reportable. This is a venous abnormality. Previously called venous angiomas, these are currently referred to as a developmental venous anomalies (DVA).

Glomus tympanicum tumors of the middle ear are not reportable. The 2005 WHO Classification of Head and Neck Tumors classified these tumors as a borderline [/1] behavior and recorded them in the ICD-O-3 with histology code 8690 [glomus jugulare tumor, NOS].

According to WHO, "the distinction between jugular and tympanic paragangliomas can easily be made in the patient by modern imaging methods ... the jugular neoplasm is identified as arising from the jugular bulb region ... while the tympanic neoplasm is confined to the middle ear." Benign and borderline neoplasms of the middle ear [C301] are not reportable. The middle ear is not a reportable CNS site for benign and borderline tumors.

Gelfoam tract embolization for a CT-guided renal biopsy is not treatment. It is a method to plug the biopsy track to reduce the risk of hemorrhage.

For your example, code the Sequence Number--Central as 61 for the 1991 diagnosis if this was a state registry requirement in 1991 and code 62 for the 2017 diagnosis.